User Manual
 OWNERS REFERENCE MANUAL
AMPEX
Welcome to the growing family of music lovers whose dis-
criminating tastes have found expression in the ownership
of an Ampex console. This manual has been prepared so
that you may realize the full potential of the quality fea-
tures engineered into your console. It is suggested that you
first read the manual carefully, operating the controls to
become familiar with their operation and function.
WARRANTY REGISTERED 196 —
(DATE!
Comento
HOME MUSIC SYSTEM
what it contains:
what it does:
how to operate it:
engineering considerations:
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AMPEX |
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Stereo Amplifier
Matching Speaker System
* PLAYS AM * PLAYS FM * PLAYS STEREO * PLAYS MONOPHONIC * PLAYS STEREO
RADIO PROGRAMS RADIO PROGRAMS RADIO PROGRAMS RECORDS RECORDS
TO TURN CONSOLE ON SEE PAGE 5
FUNCTIONAL DESCRIPTION OF STEREO CENTER SEE PAGE 4
OPERATION OF STEREO CENTER — TE SEE PAGE 5
“STEREO PHONO DESCRIPTION, OPERATIONAL FEATURES SEE PAGE 6
“HOW-TO-DO-IT TECHNIQUES" SEE PAGE 7
OPERATING CONSOLE IN CONJUNCTION WITH OTHER COMPONENTS 5 SEE PAGE 8
SPECIFICATIONS SEE PAGE 9
| SCHEMATIC CIRCUIT DIAGRAM OF STEREO CENTER SEE PAGE 10
SCHEMATIC CIRCUIT DIAGRAM OF STEREO AMPLIFIER 4 SEE PAGE 11
OWNER'S WARRANTY SEE PAGE 11
AMPEX STEREO CENTER
COMBINING THE FUNCTIONS OF STEREO TUNER AND AUDIO CONTROL
The Ampex Stereo Center provides a convenient
grouping, on a single panel, of all the controls
necessary to maximum stereo listening enjoyment
from any source. Whether the stereo source se-
lected is from magnetic tape, stereo phono, or the
Stereo Center's own integral Stereo radio tuner,
the control functions which are provided auto-
matically assure the proper matching, equaliza-
tion, and balance of the input signals.
As shown in the functional diagram, the desired
signal source is determined by pushbutton selec-
tion. If a monophonic (single channel) signal is
selected, the Stereo-Single button is depressed
so that each of the amplifier/speaker systems re-
ceives an identical input, and the resulting repro-
duced sound appears to come from a point mid-
way between the two speakers.
When stereo (dual channel) signals are selected,
the Stereo-Single button is out and each of the
incoming signals is amplified independently in
parallel circuits. The resulting reproduced sound,
depending of course upon the nature of the Stereo
signals, will appear to originate not between the
speakers but beyond them, from the same appar-
ent source and direction “heard” by the record-
ing microphones.
BUILT-IN
STEREO TUNER
EXTERNAL SOURCE
The Stereo Center is provided with separate con-
trols for bass and treble response, enabling you
to make individual adjustments as required. To
accentuate either the "'lows’’ or the "highs," turn
the bass or treble control toward the plus sign.
To de-emphasize them, turn the controls toward
the minus sign.
A separate loudness control is provided for each
channel, enabling you to make individual adjust-
ment as desired to compensate for room acoustics
or variations in recordings. The loudness controls
are mounted on concentric shafts and are friction-
coupled to permit setting and maintaining uniform
calibration as well as balancing for differences in
audio levels.
The Stereo Center's tuner section incorporates two
completely independent but carefully matched
radio tuners, designed not only for optimum FM/
AM stereo reception but also containing provision
for the later addition of a multiplex adapter unit
for FM/AM stereo. Precise tuning is simplified
through the use of visual tuning indicators, the
narrow rectangular panels located within the dial
face. An automatic frequency control switch is
also provided to lock tuning into center of incom-
ing FM signal.
DISC PLAYER TAPE RECORDER
TV, ELECTRIC
GUITAR, ORGAN, ETC.
FUNCTIONAL
DIAGRAM
OF AMPEX
STEREO CENTER
Input source, either mono- ;
phonic or stereo, is se- y
lected here, and the signal |
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!
|
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|
is sent either (A) to tape |
(8) to pre-amplifier for lis- loudness, and sent to power
| tening. | amplifier and speakers.
era en =4 Re a оо оао аа ЕЕо =
PUSH-BUTTON SELECTOR
1 Here the input signal is pre- |
| amplified, set for desired |
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AMPLIFIER
TONE CONTROL/PRE-AMPLIFIER
6570 +80 90 100
120
140
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AMPEX
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106 107
108
OPERATION OF STEREO CENTER
TURN "ON" by turning control (A) to “on” posi-
tion. This controls the main power fed to the vari-
ous components used in the Console.
SELECT DESIRED PROGRAM SOURCE FOR LIS-
TENING by using pushbuttons (D) through (H):
(D) for AM radio; (E) for FM radio; (D) and (E)
for AM/FM stereo radio; (F) for tape; (G) for
phono; and (H) for an external-source, If the
program is stereo, pushbuttan (J) must be out) if
monophonic, (J) must be in for feeding the signal
to both speaker systems. Normally, (K) will be
out. If program is to be recorded on tape, (K)
will be pushed in after program is selected and
tape machine is prepared for recording.
OPERATE SELECTED PROGRAM SOURCE accord-
ing to the instructions for the selected component,
ADJUST LISTENING LEVELS. Controls (B) and (C)
adjust the loudness level, and should be set at
the most pleasing level. The two controls are in-
dependent, but are friction-coupled so they will
normally turn together. If necessary, balance can
be corrected by holding one control while turning
the other. Tone is adjusted as desired by using
(L) for bass and (M) for treble. Turning clockwise
increases, and counter-clockwise decreases the
emphasis of bass and treble tone.
OPERATION OF TUNER. After selecting AM and/
or FM for listening, it is only necessary to tune in
the desired program. For AM, turn control (N) to
desired station as indicated by the pointer posi-
tion on the AM dial scale. Proper tuning of se-
lected station is indicated by minimum dark area
in tuning indicator (P).
For FM, use control (O) for tuning in desired sta-
tion, and (Q) for indication of proper tuning. Con-
trol (A) should be in “on'' position while tuning
in an FM station. When properly tuned in, switch
(A) to “AFC” position, which "locks" the tuning
and avoids FM drift.
For AM/FM stereo broadcasts, tune both AM and
FM to proper station. The sound level from each
station may be different, depending upon dis-
tance from your local stations. Use controls (B)
and (C) to adjust for proper balance.
STEREO
PHONO
PLAYER
The automatic record changer in your Ampex con-
sole is capable of reproducing all modern stereo
and monophonic disc recordings. The pickup arm
incorporates a high quality dual-axis magnetic
cartridge with diamond stylus, which reproduces
microgroove stereo and monophonic discs inter-
changeably. Features of the record changer in-
clude a powerful constant-speed 4 pole motor,
extra-quiet heavily weighted turntable, automatic
shut-off and fully adjustable pickup arm.
To reject a selection, move the right-hand knob to
the REJECT position. To stop the changer before
all selections have been played, simply move the
lever to STOP position. If this is done while a rec-
ord is playing, that record will be rejected when
changer is again placed in operation.
MANUAL CONTROL
The purpose of the manual control is to disconnect
the changing mechanism so that single records
can be played as on a transcription turntable.
Move the MANUAL-AUTO knob to MANUAL and
replace the long record spindle with the short
spindle. The pickup arm will be free to move and
you can play the unit as a single record player.
At the completion of a record the pickup will rise
and return to its rest leaving the turntable revolv-
ing. To stop motor and turntable, move the right-
hand control to STOP.
SPECIAL NOTE: 45- AND 78-RPM RECORDS
If you plan to use your record changer with 45-
rem records, first pull out the slender record
spindle and install the large spindle. Place the
seven-inch 45-rpm records over the large spindle
and do not lower the record clip. Adjust the speed
change knob to ‘‘45' and play records as you
normally would.
Although the cartridge on the record changer may
be used interchangeably with any microgroove
record, stereo or monophonic, it would be wise
not to use it with 78-rpm records. It is recom-
mended that you use a special cartridge, avail-
able at nominal cost in any hi-fi store, for playing
78-rpm records.
TO OPERATE:
1. MOVE SPEED CHANGE KNOB
TO DESIRED SPEED
2. SET LEVER FOR SIZE OF RECORD
TO BE PLAYED
3. PLACE UP TO EIGHT RECORDS ON SPINDLE,
AND LOWER CLIP
4. MOVE SWITCH TO "ON"
"HOW-TO-DO-IT" TECHNIQUES
To Play Monophonic (AM or FM) Radio Programs
AM: Set push-buttons as shown in chart at right.
Turn the AM radio tuning control $) to bring the
pointer on the upper scale to the approximate
station setting desired. The station is precisely
tuned in when the dark band in the center of the
visual tuning indicator Q is at its narrowest.
FM: Set push-buttons as shown in chart at right.
Turn selector control & to ON.” Turn the FM
radio tuning control © to bring the pointer on
lower scale to the approximate station setting de-
sired. Station is precisely tuned in when the dark
band in the center of the visual tuning indicator
© is at its narrowest point. Now turn control €
to FM-AFC, which will cause the tuning circuit to
lock automatically on to the incoming signal and
compensate for any frequency drift.
To Play Stereo Radio Programs: Set push-buttons as
shown in chart at right. The AM and FM push-
buttons should be depressed simultaneously so
that both engage. Turn tuning controls & and
O to proper settings for the AM and FM fre-
quencies of the stations which are broadcasting
stereo, tuning for the narrowest gap in the visual
tuning indicators. Now release the AM and FM
buttons one at a time, and adjust controls ©
and @ individually to properly balance the two
signals, accommodating any possible differences
in the station's AM and FM signal strengths.
To Play Monophonic Records: Review page 6: then
set push-buttons as noted in chart at right. Release
the arm catch, and make certain the plastic ex-
tension is in place at the end of the selector arm.
Set the speed control knob and size selector for
the records being played, and lower the clip so
that it secures the records. Move the changer
switch to “ON”.
To Play Stereo Records: Since the record player in
your console will play both monophonic and stereo
records interchangeably, the settings and operat-
ing procedure are identical with those noted above
for playing monophonic records. However, it is
possible that some stereo recordings will repro-
duce more to your satisfaction if you adjust con-
trols @ and 6 independently to achieve better
balance between channels.
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ADJUST CONTROLS SHOWN WITH COLORED DOTS
To Ploy Monophonic AM Radio Progroms
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ADJUST CONTROLS SHOWN WITH COLORED DOTS
— To Play Monophonic FM Radio Programs
A o: H
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ADJUST CONTROLS SHOWN WITH COLORED DOTS
To Play Stereo Radio Programs
A Dn H
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ADJUST CONTROLS SHOWN WITH COLORED DOTS
To Play Stereo or Monophonic Records
Ax Desired
As Desired
Tuna Station
As Desired
As Desired
Tune Station
As Desired
xs Desired
Tune Station
Tune Station
As Desired
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OPERATING YOUR CONSOLE
IN CONJUNCTION
WITH OTHER COMPONENTS
Your Ampex console was designed to operate in
conjunction with a tape recorder such as the Am-
pex stereo tape recorder/player, which may be
added to your system at any time. With such an
addition, cabled into the system as shown in the
diagram below, the number of operations you can
perform will be greatly multiplied. You'll be able
to record as you listen, from monophonic or stereo
records and radio programs, as well as recording
“live” with microphones. In addition, you'll be
enabled to record sound from any external source,
such as from your TV, from electric guitar, organ,
or other instrument with electronic output. At right
is a photograph showing the connector panel,
noting the proper connections for use with ex-
ternal inputs.
STEREO =
STEREO TAPE RECORDER/REPRODUCER
AMPEX
STEREO
CENTER
Inputs
4 high level (approximately 200,000 ohms)
2 low level phono (approximately 50,000 ohms)
AM and FM antenna connections
AM ferrite antenna included
FM 300 ohm input.
FM Sensitivity
5 microvolts for 30 db quieting, IHFM Standard.
FM Bandwidth
200 KC.
AM Bandwidth
7.5 KC.
Outputs
2 to power amplifier, 2 to tape recorder RECORD input.
DUAL
POWER
AMPLIFIER
Per channel specifications
Total Harmonic Distortion
Less than 1.0% at rated output.
Frequency Response
+1 db from 20 cps to 50,000 cps at rated output.
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Output Loading
25,000 ohms or greater with less than 2500 mmfd. ca-
pacity.
Frequency Response
With 250,000 ohm load —
+2 db from 20 to 20,000 cycles, tone controls in flat po-
sition.
Hum and Noise Level
From high level inputs — better than 68 db below 2 volts.
From phono inputs — better than 58 db' below 2 volts.
Maximum Gain
From high level inputs to outputs — 0 db.
From phono inputs to outputs — 44 db at 1,000 cycles.
Harmonic Distortion
Less than 0.09% for 1 volt output.
Program Power Output
15 watts; 30 watts peak.
Noise and Hum
78 db below rated output or better.
Input Sensitivity
Less than .80 volts to develop rated power.
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OWNER'S WARRANTY
WELCOME TO THE GROWING FAMILY OF
If any part except tubes should prove to be
defective during the aforementioned ninety.
day period, such defects should be brought
to the attention of the Ampex Audio dealer
from whom the equipment was purchased.
If upon examination the part is determined
to be defective in material or warkmanship,
the dealer will replace the defective part of
no charge. The responsibility of Ampex
Audio Company is limited to making a new
or factory-reconditioned replacement part
available to the decler through on Ampex
Audio Authorized Service Center. It is the
responsibility of the dealer to replace de:
fective parts, either by his own service per-
sonnel or through on Ampex Audio Author-
ized Service Center.
The foregoing is in lieu of all other warran-
ties, expressed, implied or statutory, and
Ampex Audie Company neither assumes nor
authorizes ony person to assume for it any
other obligation or liability in connection
with soid equipment.
THIS WARRANTY IS EFFECTIVE ONLY WHEN
ACCOMPANYING CARD IS FULLY AND
PROPERLY FILLFD OUT AND RETURNED TO
FACTORY WITHIN TEN (10) DAYS OF
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