Sansui RA-700 User manual

OPERATING INSTRUCTIONS
SOLID-STATE REVERBERATION AMPLIFIER
SANSUI RA-700
Sansut.
SANSUI ELECTRIC CO., LTD.

Congratulations on joining the thousands of proud,
satisfied owners of quality stereo components from
Sansui.
The RA-700 reverberation amplifier is a unique com-
ponent to add a new thrilling pleasure to your stereo
enjoyment. It can provide reverberation effects to all
the program sources set up on your existing stereo
control amplifier, including the playback from, record-
ing on a tape deck, and dubbing between two tape
decks. The continuously controllable reverberation
time, multicolored reverberation indicator and other
new ideas have been engineered into the RA-700.
This manual has been prepared to guide you in con-
necting and operating the reverberation amplifier cor-
rectly. Please read it carefully before operating the
amplifier and retain it for future reference.
CONTENTS
SWITCHES AND CONTROLS orcsssssscasnacsvcennsnnve 3
CORINEC TIONS assicnestesrassemenessooncasenndenceisancyewsnt 4
CONNECTIONS/OPERATION ccsiccerssnsnanvaswes 5, 6
HINTS ON USE/ACCESSORIES wisi ss sssvnnsnnucnes 7,8
SPECIFICATIONS/BLOCK DIAGRAM ................ 9
BGHEMA TIC DIAGRAM cscxscssnsmnsstessianasconsesies 10

REVERBERATION
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REVERBERATION
AMPLIFIER
—

SWITCHES AND CONTROLS
REVERBERATION INDICATOR
The reverberation indicator is illuminated when
the Reverberation On or Record button is de.
pressed. The two rainbows, one inverted, draw
sharply and distinctly apart as the reverberation
REVERBERATION TIME CONTROL
Use this control to adjust the reverberation time
while watching the reverberation indicator. To
lengthen the time, turn it clockwise; to shorten
the time, turn it counterclockwise.
time is shortened.
POWER
REVERBERATION TAPE MODE
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ON OFF RECORD
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REVERBERATION AMPLIFIER
RA-700
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POWER SWITCH
Push this switch once to turn the power on; push
it again to turn the power off.
POWER INDICATOR
The power indicator is lit when the Power switch
is turned on. It remains lit while the amplifler
is on.
REVERBERATION PUSHBUTTONS.
ON—Depress this button to add reverberation to
any program source. If it is depressed during
the recording process, the recording is made
without reverberation but only the sound from
the speakers is reverberated.
OFF—Depress this button if you want not to add
reverberation during the recording process or
while listening to records, radio broadcasts or
tapes.
RECORD—Depress this button to add reverbera-
tion to the sound of the recording.
TAPE MODE SELECTOR
B—Use this position to record on, or play back
through, the tape deck connected to the TAPE
DECK B jacks.
A—Use this position to record on, or play back
through, the tape deck connected to the TAPE
DECK A jacks.
OFF—Use this position to provide reverberation
effects to a program source set up on the receiver
(or control amplifier) connected to the RA-700.
With the selector switched to this position, the
reverberation amplifier is disconnected from the
tape deck circuits.
Ap B—uUse this position to record from the tape
deck A to the tape deck B.
Bp A—Use this position to record from the tape
deck B to the tape deck A.

CONNECTIONS
GROUNDING
TAPE DECK Sarsvwe poo am AMPLIFIER
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REC PLAY REC PLAY
UNSWITCHED
TOTAL 300VA
MAXIMUM
TO TAPE _—
TURNTABLE, ETC. a ~b
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TUNER
AUX
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REAR PANEL OF RECEIVER
(or control amplifier)
TO INPUTS TO OUTPUTS TOINPUTS
OF TAPE OF TAPE OF TAPE
DECK A DECK A DECK B
TO OUTPUTS
OF TAPE DECK B
TAPE DECKA TAPE DECK B

CONNECTIONS OPERATION
TAPE DECK A TAPE DECK B
PLAYBACK = RECORDING<=
RECEIVER OR
RA-700 CONTROL AMPLIFIER
OUTPUTS
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REVERBERATION AMP. INPUTS
WALL AC OUTLET
CONNECTION TO RECEIVER OR CONTROL AMPLIFIER
RA-700 RECEIVER OR
REVERBERTION
AMP
CONTROL
AMP
TAPE (REC) Outputs
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CONNECTION OF TAPE DECK TO RA-700
RA-700 TAPE DECK
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TURNTABLE
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To Reverberate Sound From Any Pro-
gram Source—Record Player, Tuner
or Microphone—Except Tape Deck
1. Set the Tape Monitor switch on the receiver
(or control amplifier) to its PLAYBACK or
ON position.
2. Turn the Tape Mode selector on the RA-
700 to its OFF position.
3. Depress the Reverberation On button.
4. Adjust the Reverberation Time control to
the desired reverberation.
To Reverberate Sound From or
Through the Tape Deck
Playback
1. Set the Tape Monitor switch on the receiver
(or control amplifier) to its PLAYBACK or
ON position.
2. Turn the Tape Mode selector on the RA-
700 to A or B depending on which jacks are
being used for playback.
3. Depress the Reverberation On button.
4. Operate the tape deck in the playback
mode.
5. Adjust the Reverberation Time control to
the desired reverberation.
Recording
1. Set the Tape Monitor switch on the receiver
(or control amplifier) to its PLAYBACK or
ON position.
2. Turn the Tape Mode selector on the RA-
700 to A or B depending on which jacks are
being used for recording.
3. Depress the Reverberation Record button.
4. Operate the tape deck in the recording
mode.
5. Adjust the Reverberation Time control to
the desired reverberation.
Notes:
¢ If the Reverberation On button is depressed
during the recording process, the original pro-
gram can be recorded without reverberation
while the reverberated sound comes from the
speakers.
¢ If the Reverberation Off button is depressed
during the recording process, no reverberation
is added to the sound of the recording nor to
the sound from the speakers.
Dubbing
1. Set the Tape Monitor switch on the receiver
(or control amplifier) to its PLAYBACK or
ON position.
2. When recording from the tape deck A to
the tape deck B, turn the Tape Mode selector
to APB; when recording from the B to the A,
turn the selector to BRA.
3. Depress the Reverberation Record button.
4. Operate one tape deck in the playback
mode and another in the recording mode.
5. Adjust the Reverberation Time control to
the desired reverberation.
Note: If you want not to add reverberation
during the dubbing process, depress the Rever-
beration Off button. If the Reverberation On
button is depressed during the dubbing process,
the original tape can be recorded without re-
verberation while the reverberated sound
comes from the speakers.
Monitoring
If your tape deck has its own preamplifier as
well as separate recording and playback heads,
you can monitor the tape instantly after the
recording is made and while the recording is
still in progress. For use with a two-head tape
recorder which can pick up a signal before the
recording is made, you can listen to it as well.
If a two-head tape recorder which does not
employ this arrangement is used for recording,
not playback, the Tape Monitor switch on the
control amplifier (or receiver) should be set to
its SOURCE or OFF position, otherwise no
sound comes from the speakers.
—_

HINTS ON USE/ ACCESSORIES
Connections
Be sure to use shielded cable (four connecting
cords supplied) to connect a control amplifier
and tape decks to the RA-700. The use of an
ordinary twin leadwire may cause hum or
noise. Always check to see if the connecting
cords are plugged firmly and properly into their
corresponding output or input jacks. If the
connections are loose or in touch with other
parts, the RA-700 will not perform normally,
and may produce undesirable noise. If used in
such a way for a long time, it will eventually
break down.
A.C. Outlets
The two a.c. outlets on the rear panel are live
at all times and for plugging in a pair of tape
decks. The voltage delivered at these AC out-
lets is the same as the power supply voltage
used. They have a maximum capacity of 300
VA total. Never use them beyond their rated
capacity.
UNSWITCHED
TOTAL 300VA
MAXIMUM
Power Fuse
If the unit remains completely dead when the
power is switched on (the POWER indicator
fails to light), the power fuse is probably blown.
In this case, remove the line cord from its a.c.
outlet and replace the fuse after finding and
eliminating the trouble that caused the fuse
to blow. Use only an identical glass-tubed fuse.
For 100-117 volt operation, a 0.5 ampere fuse
is required. For 220-240 volt operation, a 0.3
ampere fuse should be used. Never attempt
to use a piece of wire or a fuse of a defferent
capacity as a substitute.
100/117V O.SA
220/240V 0.3A
Replace with same type fuse
FW
NF
Grounding
Connect one end of vinyl or enameled wire to
the terminal screw marked GND on the rear of
the amplifier, attach a copper plate to the other
end and bury it underground. In all cases,
grounding is desirable since it allows a better
SN ratio to be obtained. To ground an entire
audio system, connect the grounding wire of
each component to this terminal.
COPPER PLATE
BURIED UNDERGROUND

Voltage Adjustment
To reach the voltage selector, remove the two
screws from the nameplate on the rear panel
and then remove the nameplate. The voltage
selector makes it possible to operate the RA-
700 at the correct volt in any area. The volt
has been pre-adjusted at the factory, but can
be easily readjusted as follows:
1. Set the arrow on the voltage selector plug to
the required volt: 100, 117, 220 or 240 volts.
2. The power fuse should also be changed
whenever the a.c. line voltage is changed. For
100-117 volt operation, a 0.5 ampere fuse is
required. For 220-240 volt operation, the fuse
should be changed to a 0.3 ampere fuse.
Note: The voltage selector can be also used to
eliminate the trouble caused by the consider-
able voltaege fluctuation. In this case, it should
be set to the peak voltage.
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Placement
Your RA-700 may be placed in any position
where it is convenient to reach. But we recom-
mend to place it away from the speakers be-
cause unnatural reverberation or booming noise
may be caused.
ACCESSORIES _
1, OPERATING INSTRUCTIONS..........
2. OPERATING SHEET 22.00 <ascensawvean
3. CONNECTING CORDS WITH
PUN-PLUGS ciscaesaxe na ranwne wornmens
| “Operating Instructions Stock No. 9208670

SPECIFICATIONS BLOCK DIAGRAM
SPECIFICATIONS
RATED OUTPUT VOLTAGE: LOAD IMPEDANCE: 100k ohms
300mV (at 1,000Hz, Reverberation time minimum SWITCHES AND CONTROLS:
input level 200mV) REVERBERATION MODE:
MAXIMUM INPUT VOLTAGE: ON, OFF, RECORD
3V (at 1,000Hz, Reverberation time minimum) TAPE MODE:
HARMONIC DISTORTION: REC/PLAY—B REC/PLAY—A
Less than 0.2% (at 1,000Hz, Reverberation A—B DUBBING
time minimum output level 300mV) B—A DUBBING
FREQUENCY RESPONSE:
20 to 30,000Hz +2dB POWER REQUIREMENT:
(at Reverberation time minimum) POWER VOLTAGE: 100, 117, 220, 240V
20 to 30,000Hz +10dB 50/60Hz
(at
Reverberation
time
maximum)
POWER
CONSUMPTION:
9W
(rated)
SIGNAL TO NOISE RATIO: SEMI-CONDUCTORS: Transistors: 11 Diodes: 3
65dB
(at
output
level
300mV)
DIMENSIONS:
111/16”(280mm)
W,
REVERBERATION TIME: 415/)6”(125mm) H,
1.9 to 3.2 second (at 1,000Hz) 107/167(264mm) D
INPUT IMPEDANCE: WEIGHT: 9.3 Ibs (4.2kg) Net
more than 200k ohms (at 1,000Hz) 11.9 Ibs (5.4kg) Packed
INPUT AND OUTPUT JACKS:
INPUT
OUTPUT
TAPE DECK—A *Design and specifications subject to change
TAPE DECK —B without notice for improvements.
BLOCK DIAGRAM
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“BUFFER AMP LOW FREQUENCY AMP
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REV AMP OUTPUT
TAPE A PLAYBACK?
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TAPE B PLAYBACK i is Ge. | REVERBERA- ) TAPE A RECORDING
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REV AMP OUTPUT
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TAPE B PLAYBACKG-—-O *—-+- “| &)
TAPE B RECORDING
TAPE A RECORDING
REVERBERATION
UNIT
AC 100V
117v
220V
240V