Henry Radio 3K Classic Mark II, X Mark II, 5K Classic Linear Amplifier Operating and Maintenance Manual
Below you will find brief information for Linear Amplifier 3K Classic Mark II, Linear Amplifier 3K Classic X Mark II, Linear Amplifier 5K Classic. These are high quality console model one-stage linear RF amplifiers designed around the rugged economical Eimac 3CX1200A7 ceramic triode.
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Henry Radio
Linear Amplifiers
-----------------------------
Operating and Maintenance
Manual
-----------------------------
3K Classic Mark II
3K Classic X Mark II
5K Classic.
-
2050 S. BUNDY DRIVE
LOS ANGELES, CA 90025 USA
IIEMRY REIDIO
(213) 820-1234
Telex: 67-3625 (Henradio)
SECTION 1. SPECIFICATIONS.
TYPE
AND FUNCTION OF EQUIPMENT - All these models are floor console linear amplifiers
RF power amplifiers operating in the 3.5-30 MHz frequency range.
They can be used for communications, industrial, or scientific applications.
TYPEDFEMISSION ----------------- SSB, AM, CW, FM or RTTY.
OUTPUT POWER - 3K Classic Mark II
1540 Watts PEP, 750 Watts Continuous.
3K Cl assic X Mark 11 2500 Watts PEP, 1500 Watts Continuous.
5K Classic
3500 Watts PEP, 2400 Watts Continuous.
GAIN 3K Classic Mark II
3K Classic X Mark II
5K Classic
13 dB nominal.
14 dB nominal.
14 dB nominal.
TUBE COMPLEMENT -
3K Classic Mark
II
3K Classic X Mark II
5K Classic
Eimac 3CX120nA7.
Eimac 3CX124OA7.
2 x Eiroar 3CX1200A7.
DRIVE POWER -
3K Classic Mark II
3K Classic X Mark II
5K Classic
60 to 104) watts nominal.
60 to 120 watts nominal.
60 to 200 watts nominal.
DUTY CYCLE - - - - - - - - - - - - - - - - Continuous duty at rated output.
DIMENSIONS
- - - - - - - - - - - - 32.75" HIGH x 16.50" DEEP x 15.00" WIDE.
SHIPPING WEIGHT -
3K Classic Mark II
3K Classic X Mark
5K Classic
II
125 pounds (1 box).
175 pounds ( 1 box).
190 pounds (1 box).
COOLING - - - - - - - - - - - - - - - - - - - - - - - - Forced air cooling.
POWER REQUIREMENTS - - - - - - - - - - - - - - 3 wire, single phase, 60 Hz.
3K Classic Mar k 11
230 VAC,
30 amps.
3K Classic X Mark
II
230 VAC,
30 amps.
5K Classi c
230 VAC, 40 amps.
NOTE: All amplifiers can be set up for 50 Hz operation,
or 200 VAC op--
eration,
or 2 wire 220 VAC operation -- But that special requirement
must be specified when ordered.
ALC CIRCUIT - All models have an adjustable
ALC: feedback circuit to prevent
overdrive from a high power exciter.
FREQUENCY RANGE - - - - - - - - - - - - - - - - - - 3. 5 T0 30 MHz nominal.
NOTE: Frequency
coverage above 25 MHz is available on export
models
only because of FCC regulations.
OUTPUT IMPEDANCE ------ 50 ohms unbalanced with SWR not to exceed 2:1.
INPUT IMPEDANCE - - - Tuned input circuits are used to allow a 50 ohm input
impedance across the frequency range.
2
METERING - Two panel meters monitor plate voltage, plate current and grid current of the amplifier.
HARMONIC AND SPURIOUS RADIATION - Second harmonic better than 50 dB down.
Third order distortion better than 35 dB down at full output.
NOISE LEVEL - - 40 dB down or better below one tone carrier at 1000 watts.
CONTROLS/PROTECTION - Band switch, Load control, Tune control, meter switch, standby switch, SSB/CW switch, circuit breaker ON/OFF switch, primary fuses.
REAR PANEL CONNECTORS - RF input (BNO type connector), RF output (UHF type connector-5K Classic N type connector), ALC feedback (RCA type .jack),
Relay (RCA type jack).
RELAY KEYING - A built-in DC power
supply operates at 12 VDC (3F-'.) or 26 VDC
(5K) to key
the antenna relay when the relay jack is shorted to ground.
PROTECTIVE
DEVICES - High voltage shorting switch, air flow switch on the blower, primary AC fuses, primary circuit breaker, cathode fuse.
PLATE VOLTAGE -
3K Classic Mark II
31; Classic X Mark II
558:
3000 - 3200 VDC nominal.
CW: 2000 - 22170 VDC nominal.
58B:
3600 - 3800 VDC nominal.
5K Classi c
CW: 2700 - 25oO VDC nominal.
SSB: 4200 - 4400 VDC nominal.
CW: 2700 - 2900 VDC nominal.
NOTE: The plate voltages listed above are nominal and vary with the AC
line voltage at the operating position.
OTHER FEATURES -
Conservative power supply components for superb dynamic regulation in the high voltage supply.
Resonant choke input and oil filled rapritors to improve HV regulation.
Semiconductor diode rectifiers (1.2 amp, 15 KV) for reliable operation.
Standby switch to connect exciter directly to antenna.
Vacuum output relay on 5K Classic.
DC antenna relay system for hum free operation.
Advanced fast-acting relay circuits on 3K models for semi-break-in CW operation.
All aluminum cabinets with double shielding in the RF sections for minimum cabinet radiation.
Pi--L plate circuit with silver plated tank coil to insure the cleanest most efficient output.
Backed by a 25 year history of the finest RF equipment available to the amateur market.
3
SECTION 2. INTRODUCTION
The 3K Classic Mark
II, 3K Classic X Mark II, and the 5K. Classic are a fam- ily of
high quality, console model, one-stage linear RF amplifiers designed around the rugged and economical Eimac
3CX1200A7
ceramic
triode.
All three models employ a grounded grid circuit to insure simplicity of design and years of reliable operation.
The amplifiers are completely self contained and use only the highest quality RF and DC
c omponents available today.
The 3F;
Classic Mark II uses a single tube offering about 13 dB of gain (the output is about 20 times the drive power) making it drive easily with lower power solid-state exciters.
This model uses a moderate duty power supply for operation in the United States.
FCC regulations require that units supplied in the United States can not operate on the 28 MHz band.
The 3f; Classic X Mark II is an export, military, or industrial version of the 3K Classii. Mark II.
This model mates a heavy duty power-, supply with the ';k: Classic RF deck to coffer a high gain amplifier with the reliability of an industrial type power supply.
The 5K Classic uses two 3CX120OA7
in conjunction with a special
high v-31t--
age,
heavy duty power supply for a minimum of 3500 watts PEP output in mil- itary or
commercial applications.
This amplifier is available for sale only
to military, export, or industrial users.
These
are a family of amplifiers because they are all designed around the same basic RF deck design which employs a unique rotary tank inductor not
found
in any other line of production amplifiers.
All the models can be
used for SSB, CW, RTTY,
or AM operation on any frequency between 3.5 and 30
MHz (subject to United States restrictions on 28 MHz).
Please read the instruction manual carefully before operating the new equipment.
Power amplifiers can be damaged
by operation out of
resonance.
The amplifiers are shipped with the tubes installed,
sr, no assembly is re-
quired before you can operate the equipment.
CAUTION: There
are dangerously high voltages present inside the amplifier when the power
switch is turned
ON.
Never
remove any covers
when the amplifier is plugged
in or turned
on!
Always exercise
extreme caution when
servicing
any amp-
lifier.
THE VOLTAGES FROM THE HIGH VOLTAGE POWER SUPPLY CAN
BE LETHAL!
4
SECTION 3. INSTALLATION
SECTION 3.1
UNPACKING
When you first receive the ahplifitr you must carefully inspect first tQ.
box and then the amplifier for any sign of damage during shipment.
If you see any shipping damage, save the box and packing material and notify ?.h:^ transportation company immediately.
It is a good idea to save the box and packing material in any case nr.::aur-.r they are expensive to replace and arcuseful in protecting the amplifier should you ever decide to ship it or move it to another location.
Remove the amplifier from Its shipping carton and packing material.
your unit is packed into a':aingle carton and is ready to operate with the e-xc*p-'tion of a power plug. A power plug that mates with the power socket at the operating location must be properly installed as described in section
3.33
before the unit can be operate.:.
The following accessories should be included with the amplifier.
1
1
J.
2
Instruction Manual
PL259 Coax Connector QF,7
N type Coax Connector i50
Shielded Control Cables
1
I
1
Warranty Card
Drive Cable (RG58)
Set Fuses
SECTION 3.2 OPERATING LOCATION
The amplifier
may be located wherever desired provided there is adequate
air flow from the bottom of the unit up through the top of the amplifier.
Do not restrict the airflow
o f
the amplifier, and never place it too close to a wall that might
restrict the
airflow into the hack: of the unit.
You
will require a location
that
has an appropriate 220 VAC power source. A location which avoids environmental extremes of heat, humidity, and dust
will keep the amp] i fisrr new looking and assure years of reliable operation.
SECTION 3.3 CABLING
All of the following cables must be connected before operation
of the
amplifier.
POWER CABLE
-"
The amplifier is equipped with a 3-wire AC power
cable that
is normally wired to accept 220 VAC, 3 wire, 60 Hz, single phase power .an-
-less special instructions were given at the time of the order.
A factory modification is required
for 50 Hz operation, or 200 VAC olreration, or for
2-- wire cur opean operation.
The three wires in the power 16t?le are black, white, and green. The green wire is chassis ground and the neutral on the 220 VAC plug.
The black and white wires connect the "hot" 220 VAC circuits.
A power plug is not sup-plied becau5e there are many different types of 220 VAC outlets.
We suggest that you consult with a local electrician about the proper :oril?ectlor1
5
of your plug type.
CAUTION: The amplifier will be damaged if the green wire is connected to the 220 VAC terminal. Make sure that the green is connected to the neutral terminal.
ANTENNA COAX - Use only RG-8/U coax (or better) to connect the amplifier to the antenna or dummy load.
cluded in the accessory kit.
in Figure 1 below.
A PL-259 (UHF type) coax connector is in-
Prepare the cable and connector as described
The PL-259 mates with the coax jack marked OUTPUT on the rear panel of the amplifier.
The 5K. Classic uses an N type connector which is supplied in the accessory kit.
CAUTION:
Never operate the amplifier unless it -_onnected to an antenna or a dummy load capable of handthe output of the unit. You will damage the equipment if you operate it without a load or into a load with an SWR greater than 2:1 (a reflected power more than 10% of the forward power). Measure the antenna's
SWR with an SWR meter, using only the exciter output, before operating the amplifier.
With the amplifier in the off position, the exciter output will pass through the amplifier directly to the antenna.
DRIVE CABLE
- The R8-58/U drive cable supplied in the accessory kit connects to the INPUT connector on the rear panel of the amplifier. This connector is a BNC type coax connector. The UHF connector on the other end of the cable must be connected to the f2F output connector of the exciter.
An adapter may be required if the exciter does not have a matching connector.
ALC (Automatic Level Control) CABLE - Plug the gray ALC cable into the ALC
OUT phono socket on the rear panel of the amplifier and into the ALC feedback connection on the exciter. If the exciter does not have provision for feedback of ALC voltage from the amplifier, no connection is necessary.
RELAY
CABLE - The gray relay control table must be plugged into the phano plug marked RELAY on the bark panel of the amplifier.
This cable conducts the keying signal from the exciter to switch the amplifier to the transmit condition and must be connected to the socket or connector marked antenna relay (or its equivalent) on the exciter. The exciter needs to supply only a shorting relay contact (closed to ground during transmit) to key the amp.
CAUTION:
Never apply any voltage to the relay jack of the amplifier!
Your amplifier has a built-in power supply which provides the necessary voltage.
Most modern transmitters or transceivers make easy provision for a relay control connection.
operating
If the connection is not obvious to you, examine the manual of'the exciter to find an available unused relay contact that is normally closed during transmit.
Some modern transceivers use diode switching rather than relay switching.
Henry amplifiers use 12 VDC (or 26 VDC) relay control voltage, any resistance across the relay control line may keep the amplifier from keying. If your exciter will not key the amplifier, you should check the resistance
6
J ^(,:L 1 A".;5kMt::- 'F i4rYi:11_IF: C 'QA:
O i1dNE=1= i OF'. f coupling ring
jiugs 83•15P, 83-822
_
_
. ^.
rltf111tf11^^
ME
. _..... _..^.. _.. _ _.. _.... . . _..^
Cut end of cable even. Remove vinyl jacket 1', except 83-ISP
plug remove vinyl jacket 114'".
Bare '•;
of center conductor. Trim braided shield Shot LIJUP1111g
ring on cable Tin exposed center conductor and braid
Srrew the pi-if: sub on :,rt;,e: ^Noiorr a.^Nnt,!y ti, i::d:r: through solder holes mak!n); a
; :,ud bond between Win arid
shell
SuIder rwidur'.,r to. rnrt;:'
,h; nut ul.i ex:,:s..:•.:
_,
For final assembly, screw coupling ring on plug sub assembly.
-7
across the contact you are using. If there is too much resistance, contact the exciter's manufacturer about possible solutions to the problem.
SECTION 3.4 TRANSFORMER TAPS
The amplifier is normally factory wired for
22(]-230 VAC,
3 wire, 60 Hz operation unless specially ordered otherwise. If the AC mains are different then you will probably have to make a modification in the power supply.
5o
HZ OPERATION - Unlike most other amplifiers on the market, most Henry amplifiers use a resonant filter choke.
The choke is factory resonated at
60
Hz unless otherwise specified.
capacitor must be added.
For 50 Hz operation a third resonating
This will be done at the factory if specified at the time of order.
FILAMENT
TRANSFORMER
- The filament transformer is marked
EE'A 1226 (3!!
Classic) or
ECA 1194 ( 5K Classic).
They are factory tapped for
230 VAC
operation.
If the
AC line voltage is significantly different,
YOU must
rewire the taps on the transformer
( located in the power supply section).
E. CA 1 222 b
ECA 1194
Tap 1 - Common----
Tap t - 200 VAC ---
Tap 3 -2 10 VAC ---
Tap 4 - 220 VAC----
Tap 5 - 230 VAC---
Tap 1 - Common---
Tap 2 - ^00 VAC---
Tap 3 - 210 VAC----
Tap 4 - 220 VAC---
Tap 5 - 230 VAC---
Tap 6 - 240 VAC---
NOTE:
The nominal filament voltage at the tube is does not meter filament voltage,
7.5 VAC.
The amplifier so you must use an external Al:: voltmeter to measure the filament voltage at pin jacks on the back panel of the RF chassis.
The 3K Classic should measure close to 7.8 VAC at the pin jacks.
The 5K Classic
filaments
15.6 VAC.
are in series and the voltage should read about becaf the voltage varies more than 5% from these figures, the taps on the filament transformer should be changed.
HIGH
VOLTAGE
TRANSFORMER
- The 3K C lassic Mark I I domestic amplifier is
supplied with the ECA 1120A. The primary tap connections are listed below:
ECA 1120A
--------------------------------
230 VAC --------------Tap 1
; ---.-.-Tap 3
: ----.--Tap 5
230 VAC---------------Tap 7
The 3K Classic X and 5K Classic are supplied with one of the following high
voltage transformers:
8
Ei_A 1171 or ECA 1214A
Common---------------------Tap 1
200-21 0 VAC -------------Tap 2
210-230 VAi=---------- Tap 3
230-^^240 VAI.---------- -fap 4
The high voltage transformers are located on the bottom plate of the power supply section.
SECTION 4.
OPERATING CONTROLS
SECTION 4.1
FRONT PANEL CONTROLS
OFF/ON POWER SWITCH - This switch is used to turn the Al; power to the amp-lifier on and off. When the amplifier is turned off, or when the amplifier is in the standby mode, the output of the exciter passes directly to the antenna.
MULTIMF:.TEF' AND RELAY CONTROL SWITCHES - These push-button switches are lo--cated below the multimeter.
There are two interlocked pairs.
The two on the left select the function of the multimeter. The switches select either
:x plate voltage reading (0 to 10,000 VDi.? or a grid current reading (0 to
:L00 ma) on the multimeter.
The pair of switches to the right enables or disables the keying control circuit of the amplifier.
The STANDBY position makes it possible to operate the exciter only without turning off the amplifier.
SSl3/i:W SWITCH - This two position rotary switch selects between two plate transformer taps to assure the correct operating parameters for each type of emission. The amplifier must be retuned when the switch is changed.
PLATE CURRENT METER - This meter monitors the plate current of the tube or tubes in your amplifier. The meter scale reads i) to 1 amp DC.
P1LOT
LIGHTS --
The dial lights come on to indicate when the amplifier is turned on.
FUSES -•- The two 3 AG, E3 amp fuses on the front of the amplifier protect all the AC circuits other than the high voltage supply - blower, relay supply, pilot lights, etc.
LOAD GONTROL_ -- This cr,ntrol matches the amplifier's output network: to the antenna or load.
Refer to the calibration chart at the back of the manual for appropriate initial settings for the frequency of operation.
A load setting of zero corresponds to minimum loading and a load setting of 100 corresponds to maximum load capacitor mesh.
TUNE CONTR01..
-
The TUNE control is a2r? turn vernier dial connected to the variable inductor tanL:: coil.
Refer to the calibration chart at the back of the manual for appropriate initial settings
for the
frequency of operation.
.3
. ^^..:^ .
,_.
...
CONTROLS.
17
0
18
@
14 15
%
® 0 ®
19
16
20
IN
EH
22
OPERATING CONTROLS - 3K CLASSIC X Mark 11 and 5K CLASSIC
1. Plate Current Meter.
2. Multimeter.
3. Multimeter and Relay Control Switches.
4. STANDBY Light.
5. POWER Light.
6. BAND Switch.
7.
TUNE Control.
8. LOAD Control.
9. SSB/CW Switch.
10. OFF/ON Power Switch-Circuit Breaker.
11. AC Fuse.
12. AC Fuse.
13. Adjustable Feet.
14. RF Output Connector.
15. Cathode Fuse.
16. RF Input Connector.
17. ALC Connector.
18. RELAY Connector.
19. ALC Adjust Potentiometer.
20. Ground Stud.
21. Serial Number Tag.
22. Air Flow Filter.
23. AC Power Connector.
_n
23
10
BAND
SWITCH -- The BAND switch selects the correct tuned input circuit and the appropriate capacitance on the output circuit for the frequency of op-oration.
Listed below are guidelines for the band position relative to op--orating frequency.
NEVER move the BAND switch when the amplifier is keyed.
BAND
80 .... ........... 3.5 TO 5 MHZ
40
5 TO 10 MHZ
20 ............... 10 TO 17 MHZ
OPERATING FRE QUENCY
---- -------- --- ------
(Approximate)
15 ............... 17 TO 24 MHZ
10 ............... 24 T0 30 MH7-
------------------------------------------------------------------
SECT I OPJ 4.2
REAR PANEL CONTROLS AND CONNECTIONS
AU::
JACK - This socket accepts an RCA pFiono plug (an AU:: cable is pro•vided in the accessory kit) to connect a feedback: voltage from the
ampli...-
fi.er to the exciter.
No connection is necessary if the exciter does not have provisions for ALC feedback.
ALC ADJUSTMENT POTENTIOMETER -- This potentiometer controls the sensitivity of the amplifier's AU: feedback circuit. See the operating section for in-structions on how to adjust the ALC circuit.
RELAY CONTROL JACK - The RCA j ack marked RELAY CONTROL connects the
ampli--
fier to the exciter to key the
amplifier when the exciter is
transmitting.
A interconnection cable is s upplied in the accessory
kit.
is shorted
to ground,
When the socket
the amplifier's antenna relay closes. If the amplifieris turned off, or in the STANDBY
Never
apply any voltage to this socket.
mode, the relay can
not be keyed.
RF INPUT CONNECTOR
°This BNC coax connector accepts the drive line from
the exciter.
The input impedance of the amplifier is nominally 50 ohms.
F:f- OUTPUT i.CJNNECTOf='.. - The nominal output of the amplifier is 50 ohms.
Do not operate the amplifier unless an antenna or other 50 ohm load with an
SWR better than 2: 1 is attached to this connector.
An SWR of 2: 1 is indi -cated when the reflected power equals 10% of the forward power. Use only
50 ohm coax, with a power handling capacity equal to the amplifier's rated output, to connect to the load.
GROUND LUG -- This lug is provided to ground the amplifier's chassis. If YOU
connect
the amplifier- to a standard 3 pin AC outlet, it should be properly grounded.
If such a system is not used, it is a wise idea to connect the ground lug to a good earth ground. A properly grounded chassis reduces the risk of electrical shock
and minimizes
cabinet radiation.
CATHODE FUSE - This 8 Ai.^ 1.5 amp fuse protects the cathode circuit from a short circuit.
Never exceed the speci fied current rating when you replace the fuse.
POWER CORD -- The power cord must be connected to an AC power source capable of supplying the necessary current required by the amplifier.
No power Al::: plug is supplied.
Be certain that the power transformer taps are correct for the line voltage at the operating position.
11
SECTION 5.
OPERATION
SECTION 5.1 PRELIMINARY SETTINGS
Before you turn on
the amplifier,
push the STANDBY button on the function
switch.
Turn on the
amplifier with the circuit breaker on the front of
the cabinet.
The dial
lights, blower and STANDBY light should come on when
you turn on the power. The 3CX120OA7 requires no significant warmup period so you may use the amplifier within a few seconds of turning it on.
Push the operate button on the function switch and check that the F'OWEp light comes on. Key the exciter to switch the amplifier into the transmit
mode, BUT DO NOT APPLY POWER YET.
Check
that the
o perating parameters are
approximately as follows:
With the SSB/CW switch in the SSB position:
Model
Grid Current
3k:: Classic Mk 11
3K Classi c
X Mk 11
5K Classi c
0 ma
0 ma
0 ma
With the SSB/i=W switch in the CW position:
Plate Current
140 ma
130 ma
200 ma
High Voltage
3200 VI!C
395) VDC
4500 VDC
3N4 Cl assr. c Mk 11
3K Classic X Mk II
5K Classic
0 ma
0 ma
0 ma
70 ma
70 ma
100 ma
2200 VDC:
2900 VDC
3500 VDC-
The high voltage and resting current are very dependent on the AC line voltage at the operating position.
If the tube parameters are significantly different than the above reading, there may be a problem with the amplifier, or the high voltage taps on the power transformer may need to be changed.
SECTION 5.2 SSB OPERATION
Set the SSB/CW switch to SSB and make sure that the output of the exciter is turned to zero. Set the BAND switch to the appropriate position for the operating frequency.
If you have an RF wattmeter, connect it in the output line of the amplifier.
2500 watts.
The wattmeter must be capable of reading at least
Switch the exciter to the CW mode.
Step 1.
Preset
the TUNE and LOAD c ontrols of the amplifier using the cali-
bration readings from the TUNE and LOAD settings table in the back of the
manual.
Step 2.
Gradually increase the power from the exciter to drive the ampli--fier to about 400 ma of plate current.
If you have used the calibration settings provided by the factory, you should see some output power. Adjust the TUNE and LOAD controls alternately for maximum RF power, or maximum plate current if you do not have a wattmeter.
12
Step 3.
Push the grid current button on the function switch
so that the
rii!dltlmeter
is reading grid current.
Increase the drive from the exciter until the grid current is about:
3l': Classic Mark 11 . . . . . . . . . . . . . . 200 ma
3K Classic X Mark I T . . . . . . . . . . . . 250 ma
5 K Classic . . . . . . . . . . . . . . . . . . . . . . 400 ma
Step 4.
If plate current is now less than 600 ma -- - increase the LOAD control slightly.
If plate current is now more than 600 ma decrease the LOAD control slightly.
Step 5.
Adjust the TUNE control to dip the plate current (minimum plate current reading).
Step 6. Increase the drive from the exciter until the yric: current returns to the level specified above.
Repeat steps 4,
5, and 6 until the following correct operating paTameteys are reached:
Grid Current
Plate Current
^f': Classic Mark 11 . . . . . . . . . . . . 200 ma . . . . . . . . . . . . . . . . GOO mn . . . . . . . . . . . .
3F': Classic
X Mark
11 . . . . . . . . . .25r7 ma . . . . . . . . . . . . . . . . ('^r7!? ma.. . . . . . . . . . . .
5K Classic . . . . . . . . . . . . . . . . . . . 400 ma. . . . . . . . . . . . . . . . 800 ma. . . . . . . . . . . .
r:ALJTION:
So not drive
the amplifier for more than 14 seconds when it is not tuned to res{tinanne.
Ten seconds tune and 10 seconds off is a good operating habit when tuning up.
St, 7. When the amplifier has been tuned to resonance, note the dial calibration readings so that you can return to that frequency again without retuning.
Q long as the tube is in good condition and your load stays constant, tlls dial readings should stay constant for a specific frequency.
t^Ep P.
Switch the exciter to SSB operation and speak into the microphone to drzve the amplifier. The meter readings for voice peaks will be approx...
imatFly 1/2 of the meter rt-adiriq_; during tuneup.
follow the speech pattern.
Output readings will not
SECTION 3.3 ;::W OPERATION
Follow the t!.rninu procedures above for SSF3 with the SSB/CW switch in the !-:W
position.
The meter readings will be about 60% of the values of the SSB
readings.
SECTION 5.4 ,11..!:: ADJUSTMENT
The amplifier is shipped with the ALC ADJUST control on the pack panel fully counterclockwise (off). If the ALC feedback circuit is used, the ad.
justmtr!t must he made only once, uri].trss a new exciter is used.
After the
AL!= adjustment is made, use the 1ock:nut on the potentiometer shaft to lock the control into place.
13
With the ALC ADJUST control fully counterclockwise, tune the amplifier for
SSB operation.
Drive the amplifier to about 844 ma of plate current and then rotate the ALC ADJUST control clockwise until the grid current just begins to decrease.
If the exciter can not drive the amplifier to 800 ma of plate current, there is no need to adjust the ALC control.
The ALC circuit is designed to prevent overdrive (and therefore distortion) from a high powered exciter.
If the exciter does not put out more than
120 watts, the ALC connection is probably not necessary.
SECTION 5.5 ALTERNATE TUNING METHOD
When you have verified the TUNE and LOAD dial settings for each band and are more comfortable with your amplifier, the entire tuning procedure can be completed in a few seconds.
This alternate tuning method (tuning for maximum output) requires a good RF power meter capable of measuring at least 2500 watts at the output of the amplifier.
Set the TUNE and LOAD controls at the predetermined settings for the frequency desired.
Apply drive from
your
exciter to the amplifier and bring the RF output reading to about 600 or 700 watts. Adjust the TUNE and LOAD controls alternately to carefully peak the amplifier's output as shown on the RF wattmeter. The amplifier will now be tuned to resonance.
SECTION 5.6 OPERATING PRECAUTIONS
Please keep the following precautions in mind to insure safe and reliable operation of the amplifier for many years.
Voltages inside the amplifier can be lethal. Never try to disable the protection circuits designed into the amplifier. Never operate the amplifier with any of the panels removed.
Always tune the amplifier for resonance at the operating frequency before transmitting.
Never switch the BAND switch while the amplifier is keyed. You will likely have a very expensive repair bill to replace the BAND switch if make this mistake.
Never operate the amplifier into a load
with an SWR greater than 2:1.
The componen%s in the amplifier are specifically designed for operating parameters in line with the rated output listed in the specifications. Excessive drive causing output in excess of that specification will shorten tube life and endanger the reliability of other components.
14
SECTION 6.
MAINTENANCE PROCEDURES
Any time you have a problem with the amplifier be certain to check the fuses before continuing troubleshooting.
Never use a higher value fuse than the one specified on the amplifier. You can cause damage to the unit.
SECTION 6.1 INPUT MISMATCH
All Henry amplifiers have a tuned input coil for each band so that there is a relatively good match between the amplifier and exciter.
If for some reason you find high reflected power between the exciter and amplifier in the transmit mode for one band only, you will have to retune the input coil of the band where the problem exists. The RF chassis of the amplifier must be removed from the wraparound to retune these circuits.
Refer to Section
7 for a description of the disassembly procedure. The input coils are adjusted through holes on the left side of the RF chassis.
The coils are labeled as to which band they tune.
To tune the input, you
must insert an SWR meter in the drive
cable. Key the exciter at the desired
operating frequency, tune
the amplifier to that frequency, then adjust the
input
coil for minimum reflected power in the drive
cable.
If the high SWR problem appears on every band, you must assume that the input antenna relay is out of its socket, either totally or partially. Also a short in the coax beteen the input connector and the RF chassis can cause the same problem.
SECTION 6.2 REDUCED RECEIVER SENSITIVITY
If you see reduced receiver sensitivity in your exciter when the amplifier is being used, or when the amplifier is in standby, you should check the input antenna relay and then output antenna relay to see if they have vibrated out of their socket, or if they have a bad contact. The output relay on the 5K Classic is a vacuum relay. After you have ruled out one of those problems you must check the input and output coax for a short or intermittant contact.
SECTION 6.3 TUBE PROBLEMS
EXCESSIVE
PLATE CURRENT - This problem often indicates a bad tube, and the
only cure is to replace the tube. The problem can be partial, showing high resting current,
or
full short causing the circuit breaker to blow. The 5K
Classic can not be operated with
j ust one tube because the filaments are in
series.
Note that a plate current short will probably blow the cathode fuse.
Exessive resting plate current can often be caused by a failure of the bias circuit problem.
around D1.
Replace the defective diode or resistor to solve the
15
GRID/FILAMENT
SHORT - A failure of this nature can cause the amplifier to show plate current even when it is not keyed.
Another indication of this problem is negative grid current on the grid meter.
The tube must be replaced to solve the problem.
PLATE
SHORT
- A failure of this nature will cause the circuit breaker to blow. Other high voltage shorts can cause the same symptom so you must isolate the cause. If the shorted condition causes excessive plate current, the cathode fuse will blow.
LOW OUTPUT - A 3CX120OA7 can offer
many years of reliable service, you operate
the amplifier out of resonance
but if the tubes will eventually go
soft making it impossible
to drive the
amplifier
to full output.
SECTION 6.4 RELAY CIRCUIT PROBLEMS
RESTING
CUF'EENT WHEN AMPLIFIER IS NOT EXTERNALLY KEYED - If the relay is keyed you will see normal tube resting current, therefore you must suspect that the relay cable, exciter's relay, or one of the relays is malfuntioning.
Isolate the problem by disconnecting the relay cable. If the problem persists, the cause is in the amplifier. If the problem disappears the cause is in the exciter or cable. A problem in the amplifier would normally be caused by a short in the 12 VDC (26 VDC for 5K Classic) circuit or a defective relay.
THE AMPLIFIER WILL NOT KEY - Siuspett first the relay cable, then check the exciter's relay circuit.
Henry amplifiers key with 122 VDC (24 VDC for 5K) and some modern exciters use diode switching.
This combination sometimes causes a votlage drop in the relay line so that the relays will not key.
Measure the resistance across the exciter's relay contact. Any resistance can cause a volt-tage drop. If this is the case, a more sensitive external relay may be required or a modification might be required to the exciter.
Another cause could be that the relay power supply in the amplifier has failed not pro-viding the necessary voltage.
Check the voltage at the center pin of the relay jack. It should be between 12 and 20 VDC (20-30 VDC for 5F'.
Classic).
If there is no voltage check first the 3 AG fuses, then the components in the relay power supply.
A last possible cause is a defective relay.
6.5
HI GH VOLTAGE CIRCU IT PROBLEMS
The high voltage in the amplifier can be lethal!
Always disconnect the amplifier from its AC power source and turn off the power switch before you work: on the equipment.
NO PLATE CURRENT WITH EXCESSIVE GRID CURRENT - This is a sure indication of a break in the high voltage line between the power supply and the tube.
You MUST unplug the amplifier from the AC line and trace the circuit with an ohmmeter to find the break.
HIGH
VOLTAGE SHORT - A high voltage short will usually result in the circuit breaker turning the amplifier off. Also there will often be an arc indicating the source of the short. Isolate the short by disconnecting the
16
high voltage lead between the RF section and the power supply. If the short disappears the problem is in the RF chassis or B- return.
If the problem persists, the problem is in the power supply.
If the short is in the RFchas-sis or in the B- line, remove the top cover and search for any visible sign of a short.
Then use an ohmmeter to trace the circuit from the high votlage connector to the blocking capacitors, including the tube(s).
If the problem is in the power supply you will again have to check for visible signs of a short, or use an ohmmeter to locate the short. Often how-ever a high voltage short will only show when the high voltagp is applied.
To locate such a short it may be necessary to unsolder leads to remove tom_._
ponents from the circuit until the short disappears. Start with the filter capacitor, move back: to the filter choke, and then the rectifiers. Finally remove the power transformer from the circuit.
Keep in mind that a high voltage short may blow the cathode fuse in the RF chassis.
LOW PLATE
VOLTAGE - This problem is usually an indication of low AC line voltage.
It can only be solved by retapping the power transformer as des-cribed in Section 3.4.
HIGH PLATE VOTLAGE -- This problem can be caused by high AC line voltage and should be brought into specification by retapping the power transformer as described in Section 3.4.
The problem can also be caused when the filter choke is out of resonance. A resonated filter choke is used in the design because of its superb linear-ity and voltage regulation.
However, the choke must be resonated to a specific AC frequency (50 Hz or 60 Hz) using capacitors.
If the capacitor fails, or if the amplifier was set up at the factory for a different AC frequency, the voltage regulation becomes poor. The result will be excessive high voltage when the amplifier is not transmitting and excessive voltage drop during transmit.
Three .01 mf capacitors are used to resonante the filter choke for 50 Hz and two are used for 60 Hz.
NO
HIGH
VOLTAGE METER READING - The most likely cause is a blow cathode fuse in the RF chassis.
After that, other likely causes
are a
failure or value change of the high voltage multiplier resistor in the power supply, or a failure in the meter circuit.
SECTION 6.6 BLOWER PROBLEMS
These amplifiers have an airflow switch in the blower which turns the amplifier off to protect the tube in case of blower failure.
Sc' if you find that the amplifier is intermittantly turning off or if the pilot lights will not come on be sure to check the airflow switch on the blower.
The blower is one of the most susceptible parts to transportation damage.
Henry amplifiers use squirrel cage blowers because of their exceptional air blowing capability in a small size.
But the blower assembly can be easily damaged if the amplifier is dropped during shipment. When the amplifier is installed make certain that a strong flow of air is coming out the top of the amplifier when it is turned on. Other indications of blower damage can be a resonance in the amplifier cabinet caused by an unbalanced fan, an !rn-equal flow of air between the two tubes in the 5K Classic, or mechanical noise from the blower.
17
If the blower is not operating, check the 3 AG fuses on the front of the amplifier-.
If the fuses are blown, the pilot lights will not come on.
SECTION 6.7
OUTPUT PROBLEMS
The first thing to check if there is low output from the amplifier is to make sure you are getting sufficient drive from the exciter.
When the amplifier is working properly you will get 20 to 25 times amplification (13 to 15 dB gain).
Some modern exciters have power drop off on some bands so therefore the amplifier will put out correspondingly less power. Since the amplifier is superbly linear, its output varies directly with its input.
The next thing to check is the input and output cabling. An intermittant
or
shorted drive cable can cause low
or
no input to the amplifier.
This will usually show up by operating the exciter through the amplifier (in
STANDBY) and measuring the input and output power.
Low drive can also be seen as low grid current during transmit.
Also check the output cables.
Shorted coax is not uncommon and a poor job of installing coax connectors can cause severe output problems.
Other problems that can reduce output are low plate voltage, insufficient filament voltage, low AC line voltage, or a bad tube(s).
SECTION 6.8 AC LINE VOLTAGE PROBLEMS
The amplifier is normally factory wired for 220-230 VAC, 3 wire, 60 Hz operation unless specially ordered otherwise. If your AC mains are different then you will probably have to make a modification in power supply.
50
HZ OPERATION -- Unlike most other amplifiers on the market, most Henry amplifiers use a resonant filter choke.
The choke is factory resonated at
60 Hz unless otherwise speci fied.
For 50 Hz operation a third resonating capacitor must be added.
the time of order.
This will be done at the factory if specified at
FILAMENT
TRANSFORMER - The filament transformer is marked ECA 1226 (3F`
Classic) or
ECA 1194 (5K Classic). They are factory tapped for 230 VAC operation.
If your AC line voltage is significantly different, you must rewire the taps on the transformer (located in the power supply section).
ECA 1226
EEA 1194
Tap 1 - Common----
Tap 22 - 200 VAC ---
Tap 3 - 210 VAC---
Tap 4 - 220 VAC ---
Tap 5 - 230 VAC----
Tap 1 - Common----
Tap 2 - 200 VAC---
Tap 3 - 210 VAC---
Tap 4 - 22r7 VAC---
Tap 5 - 230 VAC---
Tap 6
- 240 VAC---
NOTE: The nominal filament voltage at the tube is 7.5 VAC. The amplifier does not meter filament voltage, so you must use an external AC voltmeter to measure the filament voltage at pin jacks on the back panel of the RF chassis.
The 3K Classic should measure close to 7.8 VAC at the pin jacks.
18
The 5F': Classic filaments are in series and the voltage should read about
15.6 VAC.
becaf the voltage varies more than 5% from these figures, the taps on the filament transformer should be changed.
HIGH VOLTAGE
TRANSFORMER
- The 3F, Classic Mark II domestic amplifier is
supplied with
the ECA 1120A. The
primary
tap connections are listed below:
ECA 11 2UA
23C+ VAG--------------- T'ap 1
:-----Tap 3
213r? VAC---
:------Tap 5
-------Tap 7
The 31C
Classic X and 5K Classic are supplied with one of the following high voltage transformers:
ECA 1171 or ECA 1*214A i= ^,mm,^n------^-----------Tap 1
'.,Uo-2n1 r) VAiJ---------- Tap i
'210-234 VAL:-..-------.---Tap 3
::30-12"40 VAC-.----------Tap 4
The high voltage transformers are located on the bottom plate of the power supply section.
SECTION 6.9 OTHER PROBLEMS
AMPLIFIEF? WILL NOT TURN ON The most likely cause is the circuit breaker.
Check the continuity of the circuit breaker with an ohmmeter if the unit will not turn on or off.
Another possible cause is the improper installation of the power plug on the power cable. If the high voltage turns on, but the pilot lights, blower, and relay supply do not come on the 3 AG fuse has blown.
ALC CIRCUIT SHORTED A defect in the ALE circuit will prevent the tubes from being driven properly.
FILAMENT
VOLTAGE FAILURE With a ceramic tube it is not easy to make sure that the filaments are lighting. If the filaments are lighting correctly, the air flow from the amplifier should feel warm. If the filaments are not lighting, the amplifier will not draw any resting plate current when it is keyed.
The filament voltage passes through a 4 pin Jones plug into the RF chassis, so you have no filament first check that the plug is properly connected.
After that you would have to check the filament transformer, the filament choke on the bottom of the RF chassis, or a problem at the tube socket.
Check the filament voltage at the pin jacks on the rear panel of the RF deck. It should be 7.8 VAC for the 3K and 15.6 VAC for the 5K.
19
SECTION 6.10
CONTACT ING THE FACTORY
If you have any questions concerning the service of the amplifier, you should call or write the
amplifier service department at Henry Radio.
If
it ever
becomes necessary
to return
the amplifier
to the factory
for repair
you should
first decide
if you need to send the complete amplifier or just the RF chassis.
Next pack the equipment in proper packing material to pre-
vent
shipping damage, include a short letter describing the exact problem,
insure the package
for the replacement value of the merchandise, and ship
to our
amplifier service department.
installed in the RF chassis.
Ceramic
power
tubes can be shipped
SECTION 7.
DISASSEMBLING YOUR AMPLIFIER
The description of this procedure uses screw numbers which are shown on
Figure 3.
Refer to that drawing as necessary.
CAUTION: Unplug the amplifier from the AC line before starting this procedure.
REMOVE THE TOP PANEL
- Remove screws
2,
3,
6, and 7 and pull the top perforated painted panel off of the amplifier.
REMOVE THE BACK PANEL OF THE POWER SUPPLY - Remove screws 13, 14, 15, 16,
17, and 18 and pull the back
panel
away from the power supply section.
REMOVE CABLES - Disconnect all of the cables between the RF section and the power supply section.
REMOVE THE RF DECK - First remove the BAND, TUNE, and LOAD knobs from the front panel.
Then remove two screws from the bottom of the back of the top wraparound.
These are accessed by reaching up from the back of the power supply section.
They are not shown on the diagram. Remove two screws from the area overhanging the front - screws 19 and 20.
The RF deck should now slide out of the back of the wraparound. If you should need to send the RF section back, for repair, you should send just the RF chassis, not the complete wraparound.
Most service of the amplifier can be accomplished without any further disassembly.
The front panel can now be accessed from the rear, the blower from top or bottom, and the power supply from the bark.
REMOVE
THE RF WRAPAROUND - Should you find it necessary to remove the top wraparound, remove the seven screws spaced around the inside bottom lip of the wraparound.
They are reached through the top of the amplifier.
Next disconnect the meter wiring harness and disconnect the wiring to the blower
(below the RF wraparound).
The cabinet will then lift off the power supply cabinet.
REMOVE
THE POWER SUPPLY WRAPAROUND
- The RF wraparound must be removed be-
fore you can remove the power supply wraparound. Carefully tip the power supply over to remove the four screws holding the painted wraparound to the bottom plate of the power supply.
Tip the assembly back upright and then
VERY CAREFULLY spread the back edges of the wraparound and slide it off the
front of the frame.
20
Cr
FIGURE 4.
DISSASSEMBLING YOUR AMPLIFIER.
..i,^.
F!.';T TOM
® ._ l^J
I
I
RIC,!,T ',,DE
I.
^
.
i
13
CI
L\•^_.
i vpTE
Sl'aEw; :a s••O J.O
ARL LOWED ON THE
BOTTOM OF THIS
L'}
SUReCE
•
ma^•Q
r(o;^jc)
.
REAR
FRONT
J1
H.V
J2 RF IN
4
-
C13 (X8)
I
^
C4j
L8
C17
•
I
L9
TUNE ^
,r
LOAD
L
^^ ^C18
_IlC^
^80
=
10l
L10
L1)
VACUUM
RELAY
RF OUTPUT
8
RY3
L1
-r-rl-r^ :
C1I I1C2III
- L2
^---^---
1 I I C4I I I C
82A
L3
^-^--^^YN ^'^-•^^ re1 1 ro 1 1
82B
I I ^" I I
=
L4
C; 88
C7I I CBi+
L 5 3
V1
R1A^)L7A R1B^L7B
)
V2
C49 r 80 II^
24
VDC
_
C30
3CX 1200A7(X2)
D2
IC31
R3
I II I rn
Cie (X7)
R4
C34
_
I C38 IC39
=
C45
C33
C48 C49= I _
R5 ALC ADJUST
^
?
C36
C39
D18y R8
RY1*
* D3
*RELAY IN XMIT.
C45
J5
PTTT
12VDC R7
,^. 0
8
•
.
_ •
]
J7 FILAMENT
HENRY 5K CLASSIC RF DECK - MARK 11
J105
r.µ
.
AC CORD
CB102
R120
R121
R122
1
f
S102 AIRFLOW SWITCH
J102 HARNES PLUG
J3 HARNES SOCKET \ . At •/
S103 C W/SSB
•
D101
---
_ ^I ---
T101
HIGH VOLTAGE
L101
I
C 101
--'^T
C102 I
^_-,i-_.:
C108
C103
J103 FILAMENT
R 108
1
^
1077
2 ^ F101
C107
i
R104(X2)
R117
J104 HV
ALC
B101
T103 RELAY
-
D103
Op
^
PL f01
•
PWR
^
S101A
1-- - - -- -
^
^
5K CLASSIC POWER SUPPLY
J1 HV
C11
C12T Si
DIA
12VDC
HENRY 3K CLASSIC RF DECK MARK If
L8 PLATE
CHOKE C13(XS)
L 1 4MFQ
0A S ; R1A
LO TUNE
C37LOAD
LB
L9
Cl? C18( 3)7
C24 T
T T 1--J
L10
0
10
8
L11 i
II
RY2
I-I
C40
=*C91
X-71
zrzziz
C1a(x8)
IC38 TC3Y
C35 C35
I
I
7.5 VAC
TP2
J7 FILAMENT
C42
It
C43
8
C40 C41
I
I I 1
4
8
N/C
A
N/C
7
RELAYS SHOWN IN TRANSMIT POSITION
"'^53 HARNESS
N/C
•
C44
J4
RF
OUT
J8
C48 T
l.-
1 PTT
T
is
ALC
^
J105
1
AC CORD
1-?
J101
MALE
S103 CW/SSB
D101
-14, *A-
D 102
T101
HIGH VOLTAGE
L101 f 1y1y-t-%
S102 AIRFLOW SWITCH
J102 HARNES PLUG
' • •
J3 HARNES SOCKET . ^ '
• • 8 PIN OCTAL
J104HV
•
T C103 R107
R106
C105
D107
-
If
F101
R111
R112
R113
ALC
V
T105 FILAMENT
R117
J103 FILAMENT
R102
Clog
R 104(X2)
D108(X2)
8101
T103 RELAY
M101
PLATE CURRENT
D103
PL 101
Iu
,`oa
S101A
, --^- - - - ^ - -
• •
PL 102'
--
^ f ^--- - - ^
PWR
-^
.
i
STBY
1 PL 104 1
PL103
R108
Clog 1 l/) U102 MUL TIMETER
D108
I_
(X2)
3K CLASSIC POWER SUPPLY
12VDC
R109
S101B
TERMINAL STRIP FOR CUSTOMER
GND 12VDC f FIL.CT. HV
AUX.CIRCUITRY FOR RF DECK AMPS.-NO HV POWER SUPPLY
2K CLASSIC X / 3K CLASSIC X
FILAMENT T.P.
I (X2) r---l
RF CHOKE
GND a
HV SAFETY SW.
RF IN
0
ALC
(X2)
0
FUSE
RF OUT
3CX 1200A7
(5K ONLY)
-
.
..
..
.
_.
.
......
... . _ ...... .
^T-...._
^- ---------------====--t^-1
CHAIN
3k. R 5K qG DECK
S!'.: iiu !
L-_1
i
^...___^.^.
I
GEAR
REDUCTION
AREA
=^ DIAL
LOAD CONTROL
BELOW
E
I
0
0.1 CAP
50 CYCLE
ONLY
HV.FILTER CAPACITOR
ON E;A9lNEf- r!!t _ A:;F A!-r
►
t!
C::': QSB fiw
C!R.riL,i!
BREAKERS
FUiStS{X2)
...^^:._,..^ ,... . ... .. .... . . . . ..
BLEEDERS
20K(X4)100WATT
HV. METER RESISTORS
3:.
i
12VDC coo 00000000
® O © ® ® © ® ® © 0 F^
FOWE!^ SUPPLY 2ND DECK
7/30/86 v
DIODE
&
BYPASS
FILAMENT
TRANSFORMER
ECA1216
220VAC
^r
CD
ECA5020
FILTER CHOKE h
0
HV PLATE TRANSFORMER
3K-2500VDC-ECAf1120
3KX-4000VDC-ECAf1171
5K-5000VDC-ECAf1214A
3K&5K CLASSIC POWER SUPP'-Y-LOWER DECK
7/30/86
ON CABINET-THIS AREA FOR
SSB/CW
CIRCUIT BREAKERS(X2)
FUSES (_12)
BLEEDER RESISTORS
0.1 CAP.
50 CYCLE
ONLY
HV FILTER CAPACITOR
00
HV METER RESISTORS
20K (X5) 100WATT
FILAMENT
TRANSFORMER
15VAC
ECA119A o
® ® ® ® ® ® ® ® ® ® o
^ ®
® ® ® ® 0 ® ® ® ® O
5K CLASSIC POWER SUPPLY 2ND DECK
...w.,^..a.,......w..,..
,....^.
8/1/86
RELAY SUPPLY
^
1 220VAC 1
Li Li Li
SECTION 9.
PARTS LISTS.
NOTE: ALL OF
THE BELOW SPECIFICATIONS AND PART NUMBERS ARE SUBJECT TO
CHANGE WITHOUT
NOTICE BECAUSE OF DESIGN IMPROVEMENTS OR BECAUSE OF THE
AVAILABILITY OF PARTS.
81o1
BLOWER:
230 VAC, 50/60 HZ SQUIRREL CAGE ........... DAYTON 2i=:915A
C APACITORS .................................................................
C1A
MICA, 620 PF, 500 VDU' ............................ ARCO DM15621J
C18
MICA, 200 PF, 500 VDC ............................ ARCO DM15201J
C2A
MICA, 620 PF, 500 VDC ............................AR00
DM15621J
C2B
C3A-04E3
MICA, 200 PF, 500 VDC ............................ ARCO DM15201J
MICA, 220 PF, 500 VDC ............................AR00 DM15221J r5A-06B
MICA, 110 PF, 500 VDC ............................ARGO P.M15111J
C7A
078
C8A
MICA,
75 PF, 500 VDC ............................ARrO DM15750J
MICA,
82 PF, 500 VDE::............................ AE?C0 DM15820J
MICA, 75 PF, 500 VDC ............................ARf'0
DM15750J
C8B
C9A-C9B
C:9c
MICA,
82 PF, 500 VDC ............................ ARCO DM15820J
MICA,
50 PF, 500 VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . AR00 DM 15500J
MICA, 220 PF, 500 VDC (50 .......................AR00 DM15221J
C1 0A
MICA, 1 00 PF, 500 VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . ARCO DM 15101 J
010B MICA,
20 PF, 500 VDC ............................ARE-0 DM15200J c1oc
C10D
C11-C12
C13 x 8
C16A
016Es
C17
E'18 x 3
C19 x 7
C24
MICA,
2 2 PF, 500 VDC <50 ....................... ARCO DM15220J
MICA, 160 PF,
500 VDC
(50 .......................AF<C0 DM15161J
CERAMIC DISC, .0047 MF, 10 KV ..................FK.D 1000120Z4722
CERAMIC TRANSMITTING, 1000 PF, 5 ICV ............... HE HT58T102MA
CERAMIC DISC, .01 MF, 1 kVDO ....................E'ENTRALAS DD104
CERAMIC DISC, .01 MF, 1 KVDC
( 5K) ...............OENTPALAS DD104
CERAMIC TRANSMITTING,
25 PF, 7.5 K.V .............. HE HT50V2501CA
CERAMIC TRANSMITTING,
CERAMIC TRANSMITTING, 100 PF, 7.5 KV .............. HE HT50V1O1k:A
CERAMIC TRANSMITTING,
75 PF, 7.5 KV .............. HE HT50V750KA
25 PF, 15 KV (5k).......... HE HT57V250K.A
MICA, 470 PF, 500 VDC ............................ARCO DM15-471J
C30-C31
C33--036
C37
CERAMIC FEEDTHROUGH, 2000 PF, 500 VDC .............. TUSONIX 202M
VARIABLE AIR TYPE, 350 PF, LOAD CONTROL . . ....... CARDWELL 154-10
C38--04''^
C101-C102
C103
CERAMIC DISC, .01 MF, 600 VDC .................CENTRALAS DD6-103
OIL FILLED,
. 01 MF, 7.5 KV . . . . . . . . . . . . . . . . PLASTIC CAP. LK8O-104
OIL FILLED, 16 MF, 8 KV . . . . . . . . . . . . . . . . . . . . AEROVOX BX0015D0DO8A
C104
C105
C106
C107
C108-C109
ELECTROLYTIC, 470 MF, 50 VDC .....................APCO
ME-470-50
CERAMIC DISC, .05 MF, 16 VDC . . . . . . . . . . . . . . . . . CENTRALAB
UK16-503
OIL FILLED,
. 01 MF, 7.5 ICV (50 HZ ONLY) ... PLASTIC CAP. I_K8O-104
CERAMIC DISC, .05 MF, 16 VDC ................. CENTRALAB lJk:16-503
CERAMIC DISC, .01 MF, 600 VDC . . . . . . . . . . . . . . . CENTRALAB 0D106-103
C8101
CB 102
CIRCUIT BREAKER: 30 AMPS,
250 VAC (31C)........ P & B W92X11--2-30
CIRCUIT BREAKER: 40 AMPS, 250 VAC (5K) ........ P & B W'i? X 11 -2--4t)
CONNECTORS -------------------------------------------•-----------------..- -------
J1 (3K)
J1 (5K)
HIGH VOLTAGE SOCKET AND PLUG ....................... MILLEN 37501
HIGH VOLTAGE SOCKET AND PLUG .............................. HENRY
J2
J3
RF INPUT, BNC TYPE COAX CONNECTOR .............. AMPHENOL UG647/U
HARNESS CONNECTOR, 8 PIN SOCKET ................... AMPHENOL 78S8
J4
RF OUT, UHF TYPE COAX CONNETOR (3K ONLY) ......... AMPHENOL S0239
23
J5
J6
J7
J8
J101
J102
J103
J105
RELAY CONTROL, RCA TYPE PHONO JACK ........... SWITCHC'RAFT 3501FP
ALC FEEDBACK, RCA TYPE PHONO JACK ............ SWITCHCRAFT 3501FP
FILAMENT CONNECTOR, 4 PIN JONES PLUG ............... CINCH P404AB
RF OUT, N TYPE COAX CONNECTOR (5h`- ONLY) ........ AMPHENOL UG58A/U
AC INPUT,6 PIN JONES PLUG .......................... CINCH P404AB
HARNESS CONNECTOR, 8 PIN PLUG .................... AMPHENOL 86CPB
FILAMENT CONNECTOR, 4 PIN JONES SOCKET ............ CINCH
AC
INPUT, 6 PIN JONES SOCKET ...................... CINCH
S404CCT
S404CCT
DIODES ----------------------------------------------------------------------
DIA (30
BIASING DIODE,
10 VDC, 1.2 AMPS ....................CSDC: 45XV245
D1A (51<)
BIASING DIODE,
10 VDC, 2 AMPS ................... CSDC 423PDIOAE1
D2
RECTIFIER,
1 AMP,
200 PIV, ALC ................... MOTOROLA 1N458
D3
RECTIFIER, 1 AMP, 1000 PIV ............................... GE 509
D101-D102
RECTIFIER, 1.2 AMP, 15 KV .......................... CSDC 45XV246
D103-D104
RECTIFIER, I AMP, 1000 PIV ............................... GE 509
D105-Di06
RECTIFIER, 1 AMP, 1004 PIV (5K ONLY) ..................... GE 509
D107
RECTIFIER, 3 AMP, 100 PIV ....................... MOTOROLA 1N4720
D108
RECTIFIER, 1 AMP, 400 PIV ....................... MOTOROLA iN4004
D109
VOLTAGE SPIKE PROTECTOR, 250 VAC........... PANASONIC ERZC20DKE81
F1
FiDi-F102
FUSE: CATHODE PROTECTION, B AG, 1.5 AMP.... LITTELFUSE 361-001.5
FUSEHOLDER: 8 AS ............................ LITTELFUSE 372-OOIA
FUSE: AC MAINS, 3 AG, 3 AMP .................. LITTELFUSE 312-003
FUSEHOLDER: 3 AG ............................. LITTELFUSE 342-875
KNOB
KNOB
BAND SWITCH, TUNE CONTROL, LOAD CONTROL ....... RAYTHEON 175-1-2G
SSB/CW SWITCH ................................ RAYTHEON 70-7WL-2G
INDUCTORS --------------------------------------------------------------- ---
Ll
INPUT COIL,
3.5 MHZ ........................HENF'Y L1 3K CLASSIC
L'?
INPUT COIL,
7.0 MHZ ........................ HENRY L2 3K CLASSIC
L3
INPUT COIL, 14.0 MHZ ........................ HENRY L3 3K CLASSIC
L4
L5A
INPUT COIL,
2 1.0 MHZ ........................ HENRY
L4 3K CLASSIC
INPUT COIL, 28.0 MHZ (3K ONLY) .............. HENRY
L5 3K
CLASSIC
L5B
L6
L7A-L7B
INPUT COIL, 28.0 MHZ
( 5K ONLY) .............. HENRY L5 5K C LASSIC
HIGH VOLTAGE RF PLATE CHOKE ................. HENRY
L6 3K CLASSIC
PARASITIC SUPPRESSOR COIL ................... HENRY
L7 3K
CLASSIC
LB
10 METER RF OUTPUT COIL (EXPORT MODELS) ..... HENRY LB 3K CLASSIC
L9 3K CLASSIC
L9
VARIABLE ROTARY INDUCTOR, LOAD CONTROL ...... HENRY
L10
L-SECTION TAPPED COIL ............................ B & W 1608-002
L11
L13
RF ANTENNA CHOKE, 2.5 MH, 150 MA .................... MILLER 4555
FILAMENT CHOKE, TOROID ..................... HENRY
L13 3K CLASSIC
L14
L10 1
FILAMENT CENTERTAP CHOKE
( 5K only) .................. MILLER 6302
RESONATING FILTER CHOKE, 8 H, 8OQ MA . . . . . . . . . . . . . . . . . . . ECA 5020
M101
M102
METER: PLATE CURRENT, 0 TO 1 AMP ................... BEEDE 913105
METER: MULTIMETER, 0 TO I MA ....................... BEEDE 913104
PILOT LIGHTS ------------------------------------------------------------- - --
PLI01-PLI02
TUNE AND LOAD DIAL LAMP
( 3K) ...................... SYLVANIA 18t'.3
LIGHT HOLDER ASSEMBLY ................................ SMITH 1931
PL103-PL104
STANDBY AND POWER LIGHT ( 3K) ....................... SYLVANIA 327
LIGHT HOLDER ASSEMBLY .........................COMPULITE E21-1--B
PL105-PL106
TUNE AND LOAD DIAL LAMP
( 31C) ...................... SYLVANIA 1829
24
F'L107-FL108 STANDBY AND POWER LIGHT
f5K) ........................ SYLVANIA 85
RY1
F'Y< <:30
RELAY:
INPUT SECTION, 12 VDC, DPDT ..............6UARDIAN
1365PC
RELAY: OUTPUT SECTION, 12 VDC, DPDT .............BUARDIAN 1365PC
RELAY SOCKET ...................................... GUARDIAN 1365
RELAY:
VACUUM OUTPUT
RELAY ............... ITT JENNINGS RJ2B TYPE
RY3 (50
RESISTORS-------------------------------------------------------------------
F'lA-R1B CARBON, 50 OHMS, 10 WATTS, 10% ......................... RESISTOR
F:2
R3
F'4
R5
F'6
P7 fi102
R103
F'104A
R106
F'107 x 5
R111-R112
F:113
R117
F'118
R119
R120-R122
R124
WIREWOUND, 10 K OHMS, 10 WATTS, 10% ....................RESISTDE'
CARBON, i K OHMS, 1 WATT, 1O% .......................... RESISTOR
CARBON, 68 K OHMS, 1 WATT, 10% ......................... RESISTOR
POTENTIOMETER: WIREWOUND, 100 K OHMS, 5 WATTS....A & B JLU TYPE
CARBON, 220 OHMS, 1 WATT, 10% .......................... RESISTOR
CARBON, 130 OHMS, 2 WATTS, 10% (5K) .................... RESISTOR
CARBON, 150 OHMS, 2 WATTS, 10% ......................... RESISTOR
CARBON, 470 OHMS, 2 WATTS, 10% (5K) . . . . . . . . . . . . . . . . . . . . RESISTOR
PRECISION, 0.1 OHM, 1 WATT, iX . . . . . . . . . . . . . . . . . . . . . . . . . RESISTOR
WIRGAOUND, 25 OHMS, 25 WATTS, 5% .......................FcESISTOE'
WIREWOUND, 20 K OHMS, 100 WATTS, 5% (3K x 4) ........... RESISTOR
CARBON, 47 K OHMS, 2 WATTS, 10% ........................ RESISTOR
PRECISION, 10 M OHMS, 7.5 WATTS, 1% ....................RESISTOR
CARBON, 10 K OHMS, 2 WATTS, 10% ........................ RESISTOR
CARBON, 150 OHMS, 1 WATT, 10% .......................... RESISTOR
CARBON, 470 OHMS, 1 WATT, 10% ..........................kESISTOF'
WIREWOUND, 10 OHM, 50 WATT, 5% (5K) ....................E'ESISTOR
CARBON, 5 K OHMS, 1 WATT, 10% . . . . . . . . . . . . . . . . . . . . . . . . . . RESISTOR
SWITCHES ------------------------------------------------------------------st HIGH VOLTAGE
SHORTING SWITCH ................ HENRY Si 3K CLASSIC
S2 BAND SWITCH, INPUT SECTION ....................... CENTRALAB 2504
S3A-S3B
BAND SWITCH, TUNED CIRCUIT SECTION ......... HENRY S3A 3K. 6'LASSIC
S 141 A-S 101 E; FUNCT ION SWITCH, METER, STANDBY, ETC. ..... SW I T6HCRAFT 6504I K206
S102
S103
AIRFLOW PROTECTION SWITCH ........................ ROTRON
2A-100o
HIGH VOLTAGE,
SSB/CW SWITCH ............... HENRY
S103 3K CLASSIC
TRANSFORMERS ---------------------------------------------------------------
T101
HIGH VOLTAGE (3f; DOMESTIC) ............................. ECA 1120
T102
T103
HIGH VOLTAGE (3K EXPORT) ............................... ECA 1171
HIGH VOLTAGE (5F') ..................................... ECA 1214A
T104
T105
FILAMENT, 7.5 VAC r3K) ................................. ECA 1216
FILAMENT, 15.0 VAC (5K) ................................ ECA 1194
T106
RELAY SUPPLY ........................................... ECA 1161
V1-V2 TUBE: CERAMIC TRANSMITTING
TRIODE ............... EIMAC
3CX120OA7
TUBE SOCKET:
CERAMIC ....................... JOHNSON
122-0275-001
TUBE CHIMNEY: TEFLON ................... HENRY 3K. CLASSIC CHIMNEY
25
SECTION 10.
TUBE SPECIFICATIONS
The EIMAC 3CX1200A7 is a high mu, compact, forced-air cooled,
rugged, ceramic/metal power triode, intended to be used as a zero-bias Class AB2 amplifier. Grounded grid operation is also attractive since a power gain as high as twenty times can be obtained in a cathode-driven circuit.
GENERAL CHARACTERISTICS'll
ELECTRICAL
1j I
Filament: Thoriated Tungsten
Voltage ......................................................................................
7 5 Volts ' 0.37 V
Current .......... ..........................................................................................
21.3
Frequency for Maximum Ratings ................................................ ..... . ... .. . .. ... .... 110 MHz
Amplification Factor .......................................................................................
200
Interelectrode Capacitances (grounded filament connection)?
Input .....................................................................................................
20 pF
Output (max) .... ........................................................................................
06 pF
Feedback ..............................................................................................
10.3 pF
Interelectrode Capacitances ( grounded grid connection)2
Input .....................................................................................................
20 pF
Output .................................................................................................
10.3 pF
Feedback (max) ......................................................................................... 0.6 pF
MECHANICAL
Cooling ................................................................................................
Forced Air
Maximum Operating Temperatures
Plate Seal ..............................................................................................
250"C
Base Seal ............................................................................................... 250'C
Mounting Position ............................... ......... .... ........... ... .......
Vertical, Base Up or Down
Socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SK410
Chimney ................................................................................................
SK436
Maximum Length .......... ....................................................................... 6.0 in.. 147 mm
Maximum Diameter ............................................................................. 2.91 in: 73.1 mm
Weight (Approximate) ...............................................................................
2 b lb: 1.1 kg
Charar.tonsl.cs and operating values are based upon performance tests These figures may change without nut:ee as the rt"SLI11 of additional data or product refinement Varian EIMAC should be consulted before using this information for finai equipme•rl drsign
° Capacitance values are for a cold tube as measured in a special shielded fixture in accordance with EOranrrrt: IndusLrir-N /1ssorr,jtior
Standard RS 191 i6
RADIO FREQUENCY LINEAR AMPLIFIER
CATHODE DRIVEN class AB2
TYPICAL OPERATION
(Frequencies to 30 MHz) Class AB2, Cathode Driven. Peak Envelope or Modulation Crest Conditions
Plate Voltage . ............ ... . . ..... ............ .... ..... ......
2500
Cathode Voltage' . ..... . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . . . .
0
Zero-Signal Plate Current3 .......... ... .......... ........ .....
130
Single-Tone Plate Current .. ... .. ...... .... ....................
800
Two-Tone Plate Current ......................................
540
Single-1 one Grid Current3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
255
Two- Tone Grid Current3 ......................................
140
Peak rf Cathode Voltage3 .. ... .... ... .. .. ....... .......... ....
115
Peak Driving Power3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
102
Single-Tone Useful Output POWer:3 ............................
1250
Resonant Load Impedance ...................................
1750
Intrarmodulatlon Distortion ProdUCIS2
3rd Ordor ...................................................
5th Order ...................................................
-37
42
3000
0
165
800
560
250
130
105
105
1600
2080
-35
-41
3500
0
205
800
570
275
140
120
110
1870
2430
-30
-43
4000
0
240
800
565
250
112
1 15
100
2055
2780
-33
-48
1
i'ii4.dwo t.;tlhnde Doti rloy hr- pruv+rle-tl by cr ze+nrv rUodr.t
2 ThV inhVnnex:ulahun rlislurUon products arr• reltNenr.r.0 aqain5l Olt' Innr Of a fwu oqual binr• tiqnal
3 Approxrnrafc valr;cs
dB dB
MAXIMUM RATINGS:
DC Plate Voltagc! .. .. ... ... ... ............... . .............. .. .. ........................ .... .. ..... .......
5500 V
DC Plate Current .. ......................................................................................
0 9 Adr:
Grid Dissipation .............................................................................................
50 W
Plate Dissipation ......................................................................................... 1200 W
RADIO FREQUENCY POWER AMPLIFIER
CATHODE DRIVEN class c
TYPICAL OPERATION
Carrier Conditions. Frequencies to 30 MHz
Plate Voltage :..................................................................................
5000
Cathode Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+65
Plate Current ..................................................................................
800
Grid Current .. ........ .. .............. ...................................... ..................
240
Plate Load Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .
3200
Driving Power . . . .. . . . . . . . . . . . .. . . . . . . . . .. . . .... . .. .. . . . . . . . . .. . . . .... . .. .. .. ......... ....... . .
43
Plate Output Power . . . . . . . . . .. .. . . .. .. .. . .. . . . . .. ..... . .. .. . . . .. . .... . . . . . ...... ............ ..
2700
Power Gain . .. . . . . . . . . . . . . . . . ..... . . . .. . . . ... . . .. ... . . . . . .... .. ......... . .. ... ................
18
MAXIMUM RATINGS:
DC Plate Voltage ............... .... ................................... ...................................
5500 V
[)C Plate Current ..... ...................................................................................
0.9 Adc
Grid Dissipation .............................................................................................
50 W
Plate Dissipation .... ..................................................................................... 1200 W
Vdc
Vdc mA dc mA dc.
ohnis
W
W
dB
Vdc.
Vdc mA dc mA dc mA dc mA dc mA dc vAc
W
W ohms r.-7
RANGE VALUES FOR EQUIPMENT DESIGN
Fi!amcnt Current at 7.5V ...............................................................
Direct Intere!ectrode Capacitance ( grounded grid connection)
Input . . . .. ..... . ... . . .. . . . . ... ............ .. ............ .. ..... .. .... .. .. .. . .. . . ... . . .
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Feedback
Direct Interelectrode Capacitance ( grounded cathode connection)
Input .. . . .. . .. . . ... .. .. . .. .... ...... .. ....... .. .. ...... .... ... ...... . . ... . . . . .. . . .. . . .
Output ... ............................................................................
Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Min
20.0
18.5
8.8
-
18.5
8.8
Max
22.7
Aac
22.5
pF
11.8
pF
0.9
pF
22.5
pF
0.9
pF
11.8
pF
APPLICATION
MECHANICAL
MOUNTING- The 3CX1200A7 must be operated vertically. base tip or down. A flexible connecting strap should be provided between plate connector and
oxternai plate circuit. The tube must be protected from severe vibration and shock.
SOCKET The EIMAC SK-410 air system socket and
SK-4:36 -:himney are recommended for use with the
3CX1 200A7 When a socket other than the SK-410 is used. provisions must be made for equivalent cooling of the base. the envelope. and the plate lead. if a socket other than the EIMAC SK-410 is used, the user should assure himself that strong !ateral pressure
:s not applied to the tube base pins Otherwise, even though the base of the tube is reinforced, damage to he base seals may result.
COOLING-
Forced-air cooling is required to maintain
the base; seals at a temperature below 250° C. and the
Plate seal at a temperature below 250° C. Air flow requirements to maintain the above maximum temper-
..itures are shown @n cooling data curve.
At 1200 W of plate dissipation an airflow of 30 ctm with a back prnssl.ir(.-z of 0.5 inches of water should be apt;'A,;d and directed through the fins of the tube A
Min-rnur;i of 5 cfm must be supplied to the base of tube whenover thofilament voltage is on.
in all cases. the only criterion of proper cooling is the tenit.;uraVc; of the tube seals. Tube temperatures may he ifl(?aSlireci with temperature sensitive paint, spray, c)r c;rayrm
HOT SURFACES: When the tube is used in air and air
cooled, external surfaces may reach temperatures up to 200 degrees C and higher. In addition to the anode, the cathode insulator and cathode-heater surfaces especially may reach the high temperatures. All hot surfaces may remain hot for an extended time after the tube is shut oft. To prevent serious burns, take care to avoid any bodily contact with these surfaces, both during. and for a reasonable cool-down period after.
tube operation.
ELECTRICAL
ABSOLUTE MAXIMUM RATINGS: Values shown for each type of service are based on the "absolute system" and are not to be exceeded under any service conditions. These ratings are limiting values outside which the serviceability of the tube may be impaired. In order not to exceed absolute ratings. the equipment designer has the responsibility of determining an average design va!ue for each rating below the absolute value of that rating by a safety factor so that the absolute values will never be exceeded under any usual conditions of supply voltage variation in the equipment itself. It does not necessarily follow that combinations of absolute maximum ratings can be attained simultaneously.
ZERO-BIAS OPERATION:
Operation at zuro-bias is not recornmended with plate voltages over 4000 since, plate dissipation may be exceeded. A rener diode placing positive bias on the cathode or other constant voltage source may be used to reduce zero signal plate current at plate potentials over 4000 volts.
^8
CLASS-C OPERAT ION
Although specifically designed for linear amplifier service, the 3CX1200A7 may be operated as a class-C power arnplifier or oscillator or as a plate-modulated radio -frequency power amplifer
The zero-bias characteristic of the 3CX1200A7 can be used to advantage in class-C amplifiers operating at plate voltages of 4000 volts or below by employing only grid- resistor bias If driving power fails. plate dissipation is then kept to a low value because the tube will be operating at the normal stalic zero-bias conditions
FILAMENT OPERATION The rated frlament voltage for the 3CX 1200A 7 is 7 5 volts Filament voltage. as measured at the socket, Must be maintained within the range of 7 81 to / 13 volts to obtain maximum tube life
For best tube hfe ihe rnrush c:urrent to the fdament should be limited to two limes normal current during turn-on
This will minimize thermal stress on the thorrated-tungsten filarnew wire. which can cause internal tube geometry changes with repeated cycling
HIGH VOLTAGE Operating voltage tor the
3XC 1200A 7 can be deadly. so the equipment must be designed properly and operating precautions must be followed Design equipment so that no one can come in contact with high voltages All equipment must include safety enciosures for high voltage circuits and terminals, with interlock switches to open the primary circuits of the power supply and to discharge high voltage capacitors whenever access doors are opened
Interlock switches must not be bypassed or "cheated" to allow operation with access doors open Remember that HIGH VOLTAGE CAN KILL
INT ERMODULATION DISTORTION Typical operatrng conditions with distortion values included are the result of data taken during actual operation at 2 megahertz Intermodulation values listed are those measured at the full peak envelope power noted
INTERELECTRO[)E CAPACITANCE The actual rnter-
nal interelectrode capacitance of a tube is influenced
by many variables in most applications such as stray capacitance to the chassrs, capacitance added by the socket used, stray capacitance between the tube termrnals, and wiring effects. To control the actual capacitance values within the tube as the key com ponent involved, the industry and military services use a standard test procedure as described in Electronic
Industries Association Standard RS-191 This requires the use of specially constructed test fixlures which effectively shield all external tube leads from each other and eliminate any capacitanco reading to
"ground " The test is performed on a cold tube Other factors being equal, controlling internal tube capacitance in this way normally assures good interchange ability of tubes over a period of time. even if the tube is made by different manufacturers The capacitance values shown in the manufacturer's technical data. or test specifications. normally are lakon in accordance with Standard RS-191
The equipment designer is therefore. Cautioned to make allowance for the actual capacitance values which will exist in any normal application Mc:asurc^ ments should be taken with thesoe:ktrt and mounting which represent approximate final layout it capacitance values are highly significant in the design
INPUT CIRCUIT
When the 3CX 1200A/ is operated as a grounded-grid rf amplifier. the use of a resonant tank in the cathode circuit is recornmended in order to obtain greatest linearity and power Output I or best results with a single-ended amplifier it is Suggested that the cathode tank circuit operate at a 0 of two or more
SPECIAL APPLICAT IONS If it is desired to opera lF^ this tube under conditions widely different from those given here, write to the Varian Electron Device Group
Sales Office or the Product Manager. Varian EIMAC.
1678 Pioneer Rd. Salt Lake City. UT 84104, for information and recommendalion
^'^
COOLING DATA
3CX1200A7
Liters per minute
CFM
1700
1416
113
850
566
282
Inches of water
4-
60
0.6
+ 1 ^
4- 1
-
0.5
50
^-
4
-
-
1
•
^
.
0.4
40
30
20
10
0
.. ..} -
0.3
-t.
•
.
-
- - +
rt
^
,
^--
.
.
_
^ ^-
7
1-
1 t
H
-
H-H
0.2
- ^i
..,
v If
0.1
' 01 1 A
- ^
+
-t
1.5
0.5
1
PLATE DISSIPATION (kW)
CFM and pressure required to keep anode temperature at 225°C.
Standard conditions 2511C at 29.92 In. Hg
1 PAS = .00407 X In. of water
1 cubic meter/min. - 2.832 X 10 -2 X CFM
00
EIMAC 3CX1Mll7
CONSTANT CURRENT
CHARACTERISTICS
GROUNDED CATHODE
PLATE CURRENT - AMPERES
------ GRID CURRENT .- AMPERES
125
100 l
/ i f1.0
25
.^- -" ---------- 2
^^ - - - - - - - - .05
0
-25
1
2
3
PLATE VOLTAGE (kV)
4
5
0.5
0.2
0
1
3.0
2.5
2.0
1.5
32
K
L
M
N
DIM
A
D
E
F
B
C
G
H
MIN
700
DIMENSIONAL DATA
INCHES MILLIMETERS
REF MIN MAX
5 400
_ 2 750
2500
--
-
MAX
137 16
-
REF
674
635
_
312
500
3375
800
7
^937
_
- 17 15
19 6
7 65
76 75
82.7
22 g5
185 191
30'
1250
2 875
-
453
--
- -
468
--
30'
30.63
7044
NOTES:
1
REF DIMENSIONS ARE FOR INFO
ONLY Sr ARE NOT REQUIRED FOR
INSPECTION PURPOSES.
SECTION
11.
TUNE AND LOAD SETTINGS
The following are approximate settings for a 50 ohm
l-aad
de ptyndi'n4 on th^ 'AC -Iinevaltlge at"' the operatint^"psi 'ion -+
.
Model:
Serial
Number: but will vary
---------------------
St=!:TIUN 11.1 i,'A^^TORY' DATA r.-R EnUENC Y TUNE LOAD GRID MA PLATE MA
^ .^...._^_
/
^^
._..._.^.--•-•--^. .
•
•
_ .._ , _
,
- i
-^.. . _ .
-- - ----=^ ^ ^^ -- `4 z -------C ^^` -- ----
-
AL-"-'A-
-- •
_...---- ^l '-^--•--....-.-•^ ^ - ---^---j -^•-^----------
-- ---.-? _.:^_.. - .._.. -^ -^^="-------1 ^ -- -----
SEi_TION 11.21 USER DATA
OUTPUT WATTS
- -
..
_i101ih6L16W1,0
-
OUTPUT WAT'rS
FREQUENCY
TUNE LOAD GRID MA
PLATE MA
^ ^u'
/
^---- --•----•----1.- ^-^,_,^._....__.__^=_=^..'% -----------•-•---------^^-•----•---------:-----•-••-•-----
L 4
"^ ^ ^ ^1 `/ C^ •
( ^ .^. ^
------------------------------
^ ^ ^^ •^ 4^-.1._._'^ _ ^------ ti _ ^------^- '^ _---------------
:::i:,-/- -------
^.^
3-^

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Key features
- Grounded grid circuit
- Highest quality RF and DC components
- Adjustable ALC feedback circuit
- Forced air cooling
- Conservative power supply components
- Resonant choke input and oil filled capacitors
- Semiconductor diode rectifiers
- Standby switch
- Pi-L plate circuit with silver plated tank coil