Electro-Voice 6000 Series Repair Owner's Manual

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Electro-Voice 6000 Series Repair Owner's Manual | Manualzz
Contents
6000 Series Specifications 1
PAGE 3
General Circuit Functions 2
PAGE 4
Performance Check 3
PAGE 5
Trouble Shooting Procedures à
PAGE 6
6000 Standard Disassembly Procedure 5
PAGE 14
6000R Disassembly Procedure 6
PAGE 14
Trouble Shooting Tables 7
PAGE 16
Parts List 8
PAGE 17, 18, and 19
TAPCO.
TECHNICAL AUDIO PRODUCTS CORPORATION
5000 SERIES
Repair Manual
Technical Audio Products Corporation 3810 148th Avenue N.E. Redmond, WA 98052 Phone (206) 883-3510
MOD! 79 037 8/500/JPI
€
6000 SERIES SPECIFICATIONS
Frequency Response
10 Hz to 40 KHz +1 dB
Distortion 15%
Input Level: 70mV RMS
Preamp gain: 6 dB below clipping
Input Z: 1500
Equivalent input Noise -122 dBM
Available Gain >120 dB
MIKE INPUTS
Impedance Matching Low Z or High Z
Max. Input Level 1.7V RMS 2.5V RMS
LINE INPUT
Input Impedance B2K
Max. Input Level 10V RMS
EQUALIZATION Shelving Type
Continuously Variable =15 dB
Bass 80 Hz
Treble 10 KHz
Mic EQ (6000R only)
HI LEVEL OUTPUT
Max. Output Level
Output Z
LOW LEVEL OUTPUT
Max. Output Level
Output Z
ADDITIONAL SPECIFICATIONS — 6000R ONLY
+9 dB @ 20 KHz
10V RMS into 2K or greater load
+16 dBm into 600
150
20 dB down from Hi Level Output
4.7K
Maximum Output Level Output Z
Effects Send High 7.5V RMS into 1K or 150
greater load
Effects Send Low 12 dB down from 82K
Effects Send High
Monitor Send (rear panel) 7.5V into 10K or 1K
greater load
Reverb Tank
Power Requirements
Accutronics Type 4, modified
115VAC, 7 watts
WEIGHT
6000 7 pounds
6000R 10 pounds
DIMENSIONS E W H |Rack mounting
6000 15% x 7% x 3% |kit available
60008
17 х 10%” x 3344 for both units
dat dé à
2. General Circuit Functions
The Tapco 6000 Series mixers are designed to satisiy a
wide range of high quality P.A., sound reinforcement anc
recording requirements. An increasing demand for low
cost versatility has produced several design innovations.
The 5000 Series output stages are integrated circuit op-
amps, selected for low noise and high output capability.
The input preamp is capable of very wide dynamic range,
and will accept either low or high Z microphones. These
preamp features are the result of a unique design whose
fundamentals must be understood before attempting
repairs:
1. Gain Control The volume level of most preamps Is
controlled by a fader after the preamp. In the 6000
Series, the actual gain of the circuit is governed by
the volume knob. Referring to the schematic, note
that potentiometer VR1 varies the amount of nega-
tive feedback applied to the base of the first input
transistor, Q1. Mare feedback, lower gain; less feed-
back, more gain. With this control in the full
counter-clockwise (off) position, preamp gain before
the tone controls is 10 dB. In the full clockwise
position the preamp gain is over 60 dB. Proper use
of this control will always prevent preamp overload
distortion.
VOLUME
№: À
LO/HI-Z
MICROPHONE
ECC
NEGATIVE FEEDBACK
Negative Feedback Signal Flow
Fig. 2-1
2. Automatic Impedance Matching Well, matching
isn't exactly the right term. Actually, automatic im-
pedance accepting is more accurate. The measured
impedance at the input of the preamp varies between
1K and 2K ohms, depending on the setting of the
volume control. However, the circuit behaves as if it
were perfectly matched with either low or high 2
mikes. Visualize a low impedance mike connected to
the input of the preamp, as in Fig. 2-1. Any negative
feedback returned tc the input through the volume
control will be shunted to ground by this low imped-
ance. This loading of the feedback loop effectively
reduces the amount of negative feedback that
reaches the input, so the gain goes up. Now let s say
there's a high Z mike connected to the input. This
presents a much lighter load to the feedback loop, so
more of the feedback reaches the input. This lowers
the circuit gain, automatically matching the higher
output level of the high Z mike.
The actual 1 to 2K input impedance of the 6000
Series preamp presents a nearly ideal load for both
low and high impedance microphones. in the case of
low Z mikes, the dynamic range, output level and
transient response are dependent upon the load the
microphone ‘sees’ looking into the preamp input.
When a low Z microphone is operated into an im-
pedance equal to its own, dynamic range and output
leve! are reduced, and transient response suffers.
The net result is a sound that's just not quite as clean
as it should be. That's why most microphone man-
ufacturers recommend terminating their mikes into a
load NO LOWER THAN THREE TIMES THE MIKE'S
IMPEDANCE. That means a 150{1 mike should see
NO LESS than 450 ohms, and a 60002 mike should
see 1.8K. Under these recommended conditions, the
amount of distortion produced by the microphone
itself is greatly reduced, and the mike's output level
is greatly increased. The 1 to 2K input impedance of
the 6000 Series preamp meets or exceeds micro-
phone manufacturers recommendations. This can
produce a significant improvement in perceived
quality and signal to noise performance.
High Z microphones perform better into the 6000
Series preamp also. Most dynamic microphone ele-
ments are, by their very nature, low impedance. In
order to make a high Z dynamic mike, most manufac-
turers put a small low to high Z transformer right
inside the microphone housing. Of course, any
transformer that'll fit inside a mike has to be pretty
small. The bigger the transformer, the more voltage
you can get out of it. That little transformer in the
mike housing isn't going to give you much signal
before it starts producing a lot of distortion. How-
ever, the amount of signal the transformer has to
handle can be effectively reduced by loading the
secondary. In other words, plugging this high im-
pedance mike into the 6000 Series ‘medium’ im-
pedance preamp will greatly reduce the voltage
swing the transformer is required to handle. This will
tend to keep the levels in the transformer within the
real limits of the transformer's size. The net result is
cleaner sounding performance from high Z micro-
phones.
The tone control section of the preamp is the usual pas-
€
sive configuration. The two most notable characteristics
of this type of tone control are 1.) the signal is attenuated
the same amount as the available boost or cut; and 2.)
the response of the network is not exactly “flat” with the
controls at center. In the 6000 Series, the signal is pro-
cessed through the tone controls, then mixed through a
10K resistor. The other side of this resistor is the virtual
ground summing junction of an op-amp. Because this
junction is almost at electrical ground, very little signal
will be seen here.
The dual low-noise op-amps used for all mixing and out-
put functions are capable of 10 volts RMS output. Full
use of this headroom is made available to the operator by
the gain controlled mixing stage, IC4A, This summing
op-amp is operated in the inverting mode, with a variable
resistor in the feedback loop to control gain. This pre-
vents this stage from being overloaded under all condi-
tions. The mixing stage is followed by an op-amp line
driver with a gain of 12 dB (IC4B). You'll notice on the
schematic, between the mixing and output stages, the
“stacking output.” This connection is provided for com-
bining two or more mixers. As you can see, connecting
mixers together at this point puts the mix buss signal
from each mixer onto the output amp of every other
mixer. All signals from any mixers connected like this will
appear at any other mixer's main output, while the mas-
ter volume control on each mixer remains a submaster .
for its six input channels. With the exception of the Mic
EQ circuit, the 6000 standard and 6000R mixing and out-
put sections are essentially the same.
The 6000R has another completely separate mixing sec-
tion for reverb and effects. This effects mixing section
performs many functions. It provides signals for the in-
ternal reverb, the monitor output on the rear panel, and
the effects send outputs on the rear panel. It also pro-
vides the return path for external effects devices to feed
back into the mixing system. Referring to the schematic,
note that IC1A performs the effects buss mixing function.
The output of this amp drives the high and low effects
send outputs on the rear panel, as well as the next stage
of the effects section. IC1B provides pre-equalization for
the reverb drive amps. IC2A & B are both used to drive the
reverb tank in a push-pull, or balanced differential con-
figuration. IC2A is operated non-inverting, IC2B is invert-
ing (180° out of phase). The signal from the output of the
reverb tank is very small, maybe a millivolt or so. IC3A
amplifies and re-equalizes this signal. PLEASE NOTE
SWITCH SW2A IS PART OF THE REAR PANEL MONITOR
SEND JACK. WHEN A PLUG IS INSERTED INTO THIS
JACK, THE INTERNAL REVERB IS COMPLETELY DIS-
CONNECTED FROM THE REST OF THE SYSTEM. This
allows the effects buss to be used as a completely sepa-
rate mix buss for external effects mixing, stage monitor-
ing or what have you. When used in this manner, the
signal flows from the output of IC1A through the
effects/reverb mix pot VR7 and into the effects system
master amp, IC3B. This is the master gain control amp for
ALL effects system functions. Its output is mixed onto the
main buss through isolation resistor R53, and mixing re-
sistor R54.
3. PERFORMANCE CHECK
Because of the unusual operating features and many dif-
ferent functions available in the Tapco 6000 Series mix-
ers, the following performance check should be made
BEFORE OPENING THE CASE. These simple tests
will isolate the general area in which a defect may have
occurred,
PREAMP SECTION
[] VOLUME to 5
BASS and TREBLE to 0
EFFECTS to O
CHANNEL IN/OUT to IN
MASTER EFFECTS to 0
MIC EQ to OUT
MASTER VOLUME to 5
20mV/1000Hz to MIC IN
30V P-P on HI LEVEL OUT?
2.8V P-P on LO LEVEL OUT?
0 1 EE
EFFECTS SECTION
VOLUME to 5
BASS and TREBLE to 0
EFFECTS to 5
CHANNEL IN/OUT to /N
MASTER EFFECTS to 5
REVERB CONTOUR to 5
MIC EQ to OUT
MASTER VOLUME 10 0
EFFECTS/REV at MAX
28V P-P on EFFECTS SEND HI?
3.6V P-P on MONITOR SEND?
1 ff 01 3 РЕРО
Signal to Noise Ratio Test The isolation scheme of Fig.
4-1 MUST be used for this test. Resistor R2 in the isola-
tion network represents the reference impedance for the
test. In other words, to specify S/N ratio for 150 0 mi-
crophone impedance, R2 is 1500. For 6000, R2 is 6000,
etc. One other precaution: BE SURE TO SET THE
GENERATOR OUTPUT LEVEL TO PRODUCE THE DE-
SIRED LEVEL AT THE INPUT OF THE MIXER, NOT AT
THE OUTPUT OF THE GENERATOR.
As an example, let's say you want to make a S/N ratio test
to determine noise performance for a 150 0) mike that
puts out 10mV RMS. Further, the output level of the
mixer is to be 0 dBm.
1. With the test set-up of Fig. 4-1, adjust the generator
for 10mV at the mixer input.
2. Set the preamp volume somewhere in the normal
use range for this input level: approx. “5” on the
volume Knob.
3. Bring the master volume control up as far as neces-
sary to produce the 0 dBm reference level at the out-
put, INTO A 60001 LOAD.
4, Now either turn off or ground the generator output.
Remember, the gain of the preamp is affected by
load resistor R2. If you ground the preamp input the
gain will go way up. This will alter every parameter of
the S/N ratio test and produce incorrect results.
5 Read the residual noise voltage appearing at the
output. If you have a very accurate, well shielded
meter calibrated in dBm, you may be able to read the
result directly. If your meter is not calibrated in dBm, Typical Repair Scene
calculate: Fig. 4.2
0 dBm at output
BN = ZOG residual noise of mixer 4, TROUBLE SHOOTING
PROCEDURES
TT5V RMS 1
— 20L0g-5 RMS Equipment Required: Oscilloscope Low Distortion Sine
Wave Generator VTVM
BECAUSE OF THE UNUSUAL CONFIGURATION OF THE
= 20(3.19) = 63.8 dB 6000 SERIES INPUT PREAMP, THE GAIN OF THE
PREAMP IS PARTLY DETERMINED BY THE IMPEDANCE
OF THE SIGNAL SOURCE. SIGNAL GENERATORS MUST
BE ISOLATED IN THE FOLLOWING MANNER TO
GUARANTEE THE ACCURACY OF ANY TESTS TO BE
PERFORMED:
OSCILLOSCOPE
SIGNAL GENERATOR
90900000
NS
Ó 6 066610
QO 90000080 O
4.7 K 0 0
——_VVV O 9
1 » O o o
20 MV. RMS
SET GENERATOR FOR ia AT MIXER INPUT VERT,
1000 HZ SINE WAVE METAL FILM
Input Isolation Scheme
Fig. 4-1
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5. 6000 STANDARD DISASSEMBLY
Tools Reguired:
Interior Access
Step 1.
Step 2.
Step 3.
Step 4.
PROCEDURE
#1 Phillips Screwdriver
Needle-nose Pliers
Low Power Soldering Pencil
(800° max.)
Diagonal Cutters
Narrow tip flat blade
Screwdriver
Va" Nut Driver
Reference: Fig. 5-1
With mixer resting on knobs, remove six
Phillips screws securing bottom plate. DO
NOT REMOVE FEET! Carefully lift off bot-
tom plate.
Remove all 3 pin XLR connector mounting
screws.
Turn unit face up. Remove all knobs on
channels 1-6. Remove all pot nuts on chan-
nels 1-6.
With the 3 pin XLR connectors hanging out,
fold out the circuit board as in Fig. 5-1. Try
not to bump the lock washers off the pot
bushings when you do this — it'll save you
the trouble of replacing them all when you
put it back together.
6000 Standard Disassembly
Fig. 5-1
Reassembly: Reverse steps 1-4 above. Be sure there's
14
a lock washer on every pot. Also, take
care not to pinch any of the coax cables
from the 3 pin connectors under the pots.
After you get the board secured with 2 or
3 pot nuts, give each of those cables a
gentle tug to make sure they're not
pinched.
Tools Required:
Interior Access
Step 1.
Step 2.
Step 3.
Step 4.
Input PC Board Removal
Step 1.
Step 2.
Step 3.
Step 4.
6. 6000R DISASSEMBLY
PROCEDURE
#1 Phillips Screwdriver
Needle-nose Pliers
Low Power Soldering Pencil
(800° max.)
Diagonal Cutters
Narrow tip flat blade
Screwdriver
La" Nutdriver
Reference: Fig. 6-1
With the unit resting on knobs, remove six
outer Phillips screws securing bottom plate.
DO NOT REMOVE FEET!
Facing front (¥4" phone jack side) of mixer,
carefully lift the bottom plate, exposing the
front of the reverb tank and the cables that
plug into it (Fig. 6-1).
With needle-nose pliers, carefully remove
the cables from the jacks in the front of the
reverb tank, Grasp the plugs on the cables
by the metal cable clamp that extends to-
ward you. This will ensure the structural in-
tegrity of the cable.
Carefully lift off the bottom plate.
6000R Bottom Plate Removal
Fig. 6-1
Reference: Fig. 6-2, 6-3
Remove the securing nuts from the Va"
phone jacks for channels 1-4.
Referring to Fig. 6-2, desolder the SIX buss
wires that connect the two main PC boards.
Turn the unit face up. Remove all knobs
from channels 1-4. Remove all pot nuts from
channels 1-4.
Referring to Fig. 6-3: With the unit resting
on the rear apron, fold out the input board.
Reassembly:
Output PC Board Removal
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
CG Step 6.
6000R Input Board Removal
Fig. 6-3
Reverse Steps 1-4 above. Be sure there's
a lock washer on every pot, and that none
of the 3 pin XLR connector coax cables
are pinched under the pots when you re-
place the board. After you get a couple of
pot nuts replaced, check to make sure
the coax cables are free.
Reference: Fig. 6-2, 6-4
Referring to Fig. 6-2: Desolder the SIX buss
wires that connect the two main PC boards.
Desolder the black wires from the channels
5 and 6 "IN/OUT" switches.
Clip the white nylon cable tie that secures
the reverb pickup cable to the (short black)
channel 5 input wire.
Remove the securing nuts from the
sa" phone jacks for channels 5 and 6.
Don't forget the “TAPE/HI LEVEL" jack at
channel 6.
Turn the unit face up. Remove all knobs for
channels 5 and 6. Remove all pot nuts for
channels 5 and 6.
With the unit standing on its right side, foid
out the output board as shown in Fig. 6-4.
Reassembly:
6000R Output Board Removal
Fig. 6-4
Reverse Steps 1-6 above. Be sure there's
a lock washer on every pot. Look out for
those coax cables that go to the XLR
connectors on the rear panel. After you
get the board back in place, pull gently
on each coax to be sure it's not pinched
under a pot.
15
7. Trouble Shooting Table #1 — 6000 Series Input Preamp
PROBLEM POSSIBLE CAUSE SUGGESTED REPAIR €
Dead Channel, no signal Defective Transistor Check bias voltages, replace
at TP4 transistor as indicated
Dead Channel, no signal
at TP1.
Input preamp will not
clip (low gain)
Scratchy sounding
3 pin connector wires
touching. Broken input wire
Leaky capacitor
Defective transistor
Dirty element
in Fig. 4-5, 4-9.
Check input connections with
ohm meter.
Replace C1, or C3
Replace Q2, or Q3
Spray contact cleaner inside
volume control pot
Leaky capacitor Replace C2
DC level shift when Leaky capacitor Replace C5, C2, or C7
turning bass control, or Defective 2N4250 Replace Q3
channel volume control
Preamp hums
Defective transistor
Solder bridge
Replace Q1, Q2, or Q3
Look very closely
Malfunctions listed in order of probable occurrence
Trouble Shooting Table #2 — 6000 Standard Output Stages
PROBLEM POSSIBLE CAUSE SUGGESTED REPAIR
No output, distortion, oscillation, Defective RC4739 Replace IC
low output, noisy or hum
DC on output Leaky capacitor Replace C14 or C10
Defective DC feedback loop Check R24, R25, C11 €.
Power supply hum
Leaky capacitor
Defective 1N4001
High (34V) and Low (32V)
supply busses shorted
Replace C35, C36, C37 or C15
Replace D1, D2, D3, D4
With power off, check
resistance between TP7 and TP8
(1.7K Nominal)
Malfunctions listed in order of probable occurrence
Trouble Shooting Table #3 — 6000R Effects/Output Stages
PROBLEM POSSIBLE CAUSE SUGGESTED REPAIR
No output, distortion, oscillation, Defective RC473S Replace 1С4
low output, noisy or hum.
No reverb, distorted reverb, Defective RC4739 Replace IC3
no effects return
Reverb or effects send noisy,
distorted, low or dead
470 (R66) in power
supply burned, or
correct voltage at TP6.
Oscillation
DC on output
16
Defective RC4739
IC in socket backwards
Power supply shorted
Defective RC4739
Defective capacitor
Effects buss grounded
Leaky capacitor
Replace IC1 or IC2
Check IC positioning
Check for solder bridges
or misplaced wires
Replace IC1, 1С2, 1С3, ог 1С4.
Replace C15, C16, C17 or C13.
Inspect board for solder
bridges (check jumper wires) A
Replace C30 or C26 €
Malfunctions listed in order of probable occurrence
Trouble Shooting Table #3 — 6000R Effects/Output Stages
No reverb Dirty or bent contacts on Check monitor send jack switching
monitor send jack (rear) action with ohm meter.
Clean contacts as necessary.
No reverb, reverb hums Loose reverb drive plug Insert plugs as necessary
Loose reverb pickup plug
Incorrectly grounded bottom plate Tighten bottom screws firmly
Excessive hum Defective RC4739 Replace IC1, IC2, IC3, ог 1С4.
Defective 1N4750A Replace zener diode DZ1.
Leaky capacitor Replace C35, C36, C37, or C32.
Defective 1N4001 Replace D1, D2, D3, D4.
High (34V) and Low (32V) With power off, check resistance
supply busses shorted. between TP6 and TP7. (1.7K Nominal).
Malfunctions listed in order of probable occurrence
8. PARTS LIST
REFERENCE TAPCO PART NUMBER DESCRIPTION SOURCE
R1, 3, 5, 8, 28, 34 005114 82K
36, 37, 38, 39, 41, 42
R2, 52 005064 680 0
R4, 40 005143 1.3M
RE, 7, 27, 29, 15-20 005099 20K
RS, 47 005132 ‘ 470K
R10, 11, 51 005076 2.2K
R12, 14, 59 005084 4.7K
R13, 60 005060 4700
R21-26, 31 005092 10K
R30, 35, 43, 46 005124 220K
R32 005047 1300
R33 005104 33K
R35 005124 220K
R43, 46, 49 005052 220 0)
R44 005096 15K
R45, 53 005068 1K
R48 005088 6.8K
R50 005094 12K
R54 005108 47K
R55, 56, 62 005076 2.2K
R57 000094 12K
R58 005112 68K
R61 005300 390, 1 watt composition
R63 005082 3.9K
R64 005143 1.3M
All resistors 5%, Yaw carbon film unless otherwise noted.
17
REFERENCE
C1
C2
C3
C4, 18
CS
C6, 9, 12, 14, 31, 33, 34
C7
C8, 21
C10, 11
C13, 18
C15
C16, 17, 20
C22, 24, 25, 26, 27, 30
C23
C28
C29
C32
Q1,3
Q2
D1-4
IC1-4
DZ1
Ti
Power Switch
Chan. IN/QUT switch
Pilot Light
IC Socket
VR1
VR2
VR3
VR4
VR5
VR6
18
TAPCO PART NUMBER
001308
001403
001211
002022
001403
003061
003085
003025
001408
003073
004013
003001
001408
003055
003019
004022
001412
006001
006002
008021
007002
008042
302001
301001
301040
300100
005400
005401
005401
005402
005404
005403
DESCRIPTION
22uF 16V electrolytic
2.2u F 25V electrolytic
47u F 10V electrolytic
1.5uF 25V tantalum
2.2uF 25V electrolytic
.047u F polyester
.22uF polyester
.0047u F polyester
251 F 25V electrolytic
1u F polyester
22pF ceramic
001 polyester
22 uF 25V electrolytic
.033u F polyester
.0033u F polyester
39pF ceramic
100uF 25V electrolytic
NPN Transistor GES-97
PNP Transistor 2N4250
1N4001 Diode
RC4739 Dual Low Noise
Op-Amp
1N4750A, 27V 1 watt
zener diode
Power Transformer
115V pri, 24V sec.
@ 300mA.
SPST rocker switch
Neon pilot light (NEZ)
14 pin DIP IC socket
CV9610, 1.5 meg.
special audio taper
TC9611, 50K linear
taper potentiometer,
PC mount
TC9611, 50K linear
taper potentiometer,
PC mount
MV9612, 500K audio
taper potentiometer
EF9614, 50K linear
taper potentiometer
RC9613, 10K audio
taper potentiometer
SOURCE
GE Semiconductor
National
Semiconductor
Nanticoke
Raytheon
Semiconductor
ACR Electronics
Carling Switch
(TA100TRB)
Kelvin Electronics
Thermaloy
Tapco
Tapco
Tapco
Tapco
Tapco
Tapco
cs)
REFERENCE
VR7
J1, 2 etc.
Monitor out-
put jack (rear)
Effects return jack
XLR Connector
XLR Connector
Reverb tank
Chassis
Chassis
Chassis
Chassis
Chassis
knob
knob
knob
Line cord
6000 printed circuit
board complete
60008 Input printed
circuit board complete
6000R Output printed
circuit board complete
6000 Series Power
Supply Circuit Board
complete
TAPCO PART NUMBER
005403
300001
300003
300002
300006
300006
802001
450001
450003
450004
450005
450006
400001
400002
400003
303001
800002
800003
800004
800001
DESCRIPTION
RC9613, 10K audio
taper potentiometer
Ya" phone jack
Ya” phone jack
with multiple switch
V4" phone jack
with switch
3 pin XLA connector
(round)
3 pin XLR connector
(rectangular)
Modified reverb spring
and can
6000 standard top plate
6000CF top plate
6000RCF top plate
6000 bottom plate
6000RCF bottom plate
Ya" Pointer knob
Number knob
Va” Beak knob
2 cond. AC cord
PCB w/6 preamps and
output stage
PCB w/4 preamps
SOURCE
Tapco
Switchcraft #11
Switchcraft #55
Switchcraft #12A
Switchcraft C3F
Amphenol #91-456
Accutronics
Type 4
Tapco
Tapco
Tapco
Tapco .
Tapco
Tapco
Tapco
Kelvin Electronics
Belden
Tapco
Tapco
PCB w/2 preamps, effects, Tapco
reverb drive, reverb return,
and main output stages.
PCB with rectifiers,
pilot light, filter
capacitors
Tapco
19

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