Yamaha C-4 Owner's manual
 YAMAHA offers you thanks and congratulations on vour choice of the Stereo Control
Amplifier C4,
The C-4 combines in a modern and functional control amplifier the same standards
of knowhow that have made available YAMAHA’s top-notch control amplifiers C-1
and C-2 with new developments including the improved signal-to-noise ratio at the
time of cartridge installation and the continuously variable frequency turnover ability.
it further embodies many functional facilities, i.e. TONE BYPASS, REC QUT SELEC-
TOR, CARTRIDGE LOAD CONTROLS as well as the built-in headphone amplifier
and the MC amplifier, to make itself a trully talented performer.
in order to make the most of the C-4's excellent performance ability for its long
service life, please read this manual carefully before starting to use it.
® The Equalizer Amplifier adopts a dual FET
differential amplifier in the first stage. 8 The TONE BYPASS Switch enables bypassing
A sufficient dynamic margin of 285mV (1 the tone circuit, whereby the C4, despite of
kHz, 0.01% distortion) and an excellent 85dB its rich functional talents, allows a simple
SN ratio are available. circuit configuration to produce higher sound
Specia! about the C-4 is a high SN ratio and quality.
a low distortion factor at the time of actual ® The 4-gang VOLUME Control with dB display
cartridge installation. fade both equalizer amplifier and flat amplifier
Further, the RIAA deviation within =0.2dB output stages simultaneously so as to greatly
(20H 220k Hz) ensures flat frequency response, improve the SN ratio in a small volume.
making possible high-fidelity reproduction of Adoption of low impedance volume makes
recorded signals to the maximum extent. possible flat frequency characteristics and good
® The Head Amplifier for MC cartridge uses a separation.
4-stage symmetrical push-pull circuit. It enables e The Tone Control Circuit capable of contin-
an extensive noise reduction of better than uously variable frequency turnover is adopted.
77dB SN ratio, which more than satisfies It makes possible delicate and diversified sound
MC cartridge requirements, control which the conventional amplifiers can-
The PHONC-1, -2 input Circuit are provided not achieve.
with a MM cartridge load switch capable of
B-step switchover in load resistance and load ® Yamaha's unique REC OUT Selector Switch
canacity. allows recording another program while it 15
Installation of the 10082 position, especially, reproducing one.
means improved matching characteristics with ® The REC OUT and PRE OUT terminals use a
low impedance and high output MC cartridges. muting relay to prevent noise with On and
Availability of a varying load capacity means Off of the power.
different characteristics also obtainable from ® The functional panel layout is enhanced to
the same and one phono cartridge to permit unique Yamaha beauty, with the keynote of
fine selection of sound quality in reproduction. color in black.
CONTENTS
Caution: Read this Before Operating Your C-4. 3
Connection Diagram... ue 4
Front Panel and Controls... ..... 6
Connections and How fo use... ......... 9
Additional Functions L 1 1 2 12114 2 6 14 1 40 00 14
Specifications LL. 224 4 4 4 6 4 4 4 44 4 4 0 a 4 4 0 16
Block Diagram... 4 4 4 1 4 44 17
Schematic Diagram 11424 044 4 4 1 4 44 a 4 0 18
Trouble Shooting 122 2444 4 4 4 4 4 4 4 4 140 19
Please record the serial number of your
unit in the space below
Model Name C-4
Serial No,
The serial number is located on the rear
of the chassis,
Aetain this Owners Manual in a safe
place for future reference.
The C-4 is a high performance pre-amplifier
with low distortion and versatile controls,
This manual is required reading if vou are
to get the best from its special features and
controls. |
GIRAR
Do not drop or otherwise jar the C-4, which
Is a precision electronic instrument,
>
Store у
Do not place the C-4 where it will be ex-
posed to direct sunlight, excessive heat (for
instance over a radiator), cold, moisture, or
dust. |
Do not use chemical solvents (such as ben-
zene er alcohol) to remove traces of dirt,
Wipe only with a soft, slightly damp cloth.
Do not attempt to carry out internal adjust-
ments or repairs, Leave these to vour local
service representative,
Do not assume vour C4 is faulty before
checking the Trouble Shooting list on page
19 for common operating errors,
Operate all switches and knobs in accordance
with the instructions. Avoid applying undue
force, which should never be necessary, and
do not attempt to use intermediate settings.
© A
Note that the muting circuit keeps the C-4
silent for several seconds after switching ON,
to prevent the pops and clicks that can oc-
Cuir,
Do not connect other audio equipment to
the spare AC outlet sockets on the rear panel
if they will require more power than the out-
lets are rated to provide,
Keep this manual in a sate place for future
reference, and refer to it frequently until
vou are perfectly familiar with all C-4 con-
trols and functions,
Turntable (1)
{with 2 cartridge,
| | |, etc.)
Turntable (2)
{with a cartridge,
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ridge}
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Push this switch, and the C-4 will be supplied
with AC power and a lamp inside the switch
will light. Push again to turn OFF power,
*1. In several seconds after pushing the but-
ton on, sounds are not produced because the
muting relay functions to eliminate pop noise.
*7 Befcre pushing ON the POWER switch, always
place the VOLUME knob in the minimum posi-
tion {fully counterclockwise: so} so as not to
gain an indiscreetly large sound,
USES ASE Tone (Contra!
(The defeat position in the center is the flat condi-
tion point)
This enables you to emphasize low frequency
sounds (rhythm section, etc.) or to reduce them
it your speakers sound “boomy.” Turning to the
right increases the bass response, and turning to
the lett reduces it.
O TREBLE- Tone Control
{The defeat position in the center is the flat condi-
tion point)
This works similarly for the high freguencies.
Sometimes turning slightly to the left, to reduce
high frequency response, can cut out unwanted
‘hiss’ noise or record scratch, although turning too
far will give an unnatural or muffled sound. Turn-
ing to the right increases high frequency response
to compensate for absorption by soft furnishings,
curtains, etc,
* Refer to page 14 "TONE CONTROLS/TURN-
OVER FREQUENCY CONTROLS.”
When this push-button switch is pushed the indi
gation lamp lights and sound signals are made
to bypass the control circuit,
That is, the DC equalizer connects with the DC
flat amplifier directly, and accordingly ensures
high sound quality, The button pushed once more,
the light goes off and the tone control circuit is
re-connected,
* While the lamp is lighted, the filter switches
@ , and the tone controls El, €), апа
do not function even they are operated,
Please do not operate this tone bypass switch
when the tone control is left furthest to the
right (+), otherwise a sudden change of the
sound volume is caused and it will exercise
bad influence on the speakers.
GREC OÙUT Selector Switeh
This switch sends out signals for recording to
a tane deck connected.
Regardless of the position of the INPUT selector
switch, this switch termits selection of a desired
program source connected,
“i. Recording is impossible when the switch is
in OFF position. |
2. Please refer to Page 12 for how to use.
¡UDINEUT Selector Switch
This is a switch for selection of connected pro-
gram sources.
Change the switch matched with a program
source according to the table upper right.
INPUT
Selector Program Source
Switch
AUX Playback from an equipment
connected to the Aux termi-
nais
TUNER Broadcasting Reception
PRONO DISC Audition
TAPE-1 Playback from an Tape Deck
1 connected to the TAPE-1
terminals
TAPE-2 Playback from an Tape Deck
2 connected to the TAPE-2
terminals
OPHONO Input Selector Bwiteh
it is the switch to select a turntable connected.
Note: Please be sure that a turntable witha MC
cartridge is connected to the PHONO-3/MC
terminal without Тан,
To this PHONO-3/MC terminal, do not connect
a high output cartridge such as a MM car-
tridge.
(Headphone Level Cong
PHONG Input
Selector Switch Type of Cartridge on Turntable
Position
PHONC-1 MM type (IM, MI types, etc.)
(e. moving magnet type)
PHONG-2 do,
PHONO-3/MC — MC type (moving coil type)
cartridge
| MLITING Swivel
When the button switch is pressed the lamp goes
off and a straight Z0dB reduction is made in
the amplifier gain.
The button pressed once more, the lamp lights
and the gain is brought back.
* Suppose that this switch is left ON (Le. the
light keeps off) and the VOLUME @
turned to the light to effect an increase In the
sound volume. |
After that switching OFF the button in this
case produces a sudden change in the sound
volume and will resultantiy exercise bad in-
fluence on the speakers. Please be careful so
as to prevent such.
D VOLUME Control
This knob permits vou to control the overall
sound volume. Turn it clockwise to increase the
sound volume,
* When turning ON the POWER switch, always
turn this switch fully counterclockwise (oe) so
as not to be given an indiscreetly large sound.
re )
It controls the headphone sound volume,
Turning it to the right {clockwise} gives an im
crease in the sound volume.
* When the VOLUME € is left furthest to the
left (anti-clockwise!, no sound is produced
by turning the control to the right.
E
PHONES (Headphones Jack)
Connect your stereo headphones to this jack, and
use the level control {IJ to obtain sound volume
of your choice.
TIEN WED WEY
Controls
BASS: This varies the turnover freguency in
the low frequency range of the tone
control, Turning it to the right pro-
duces an increase in the turnover fre-
quency in the low frequency range, and
turning it to the left produces a de-
crease in the same,
* Please refer to “TONE CONTROLS/
TURNOVER FREQUENCY CON-
TROLS” in Page 14.
TREBLE: It varies the turnover frequency in the
high frequency range of the tone con-
trol. Turning it to the right produces an
increase in the turnover frequency of
the high frequency range, and turning
it to the left produces a decrease in the
same.
* Please refer to “TONE CONTROLS/
TURNOVER FREQUENCY CON-
TROLS in Page 14.
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LOW: When this button switch is pushed { am),
ultra low frequency noise below 15Hz
out the audible frequency range, normal-
ly unnecessary for music reproduction,
is cut-off so as to prevent the speakers
ultra low freguency reaction (fluttering
of cone paper) due to a warped disc.
* Leave this switch ON [ax ) while the
TONE BYPASS Switch is OFF to
protect the speakers.
Pushing this button switch { as} cuts
high frequency noise components over
TOK Hz.
* Leave it OFF (Al
+ for normal use.
DE Switches
The switch makes choice of mode to match a
program source connected to the input terminals.
STEREO: When the button is pushed {a=},
ordinary stereophonic reproduction ls
obtained,
REV: Pushing this button (==) produces
reverse stereo reproduction, where the
right and left channels are reversed.
Monaural reproduction is obtained by
pushing the button (==).
MONO:
© PHONC-1,-2 CARTES
Litas LEAL
Eto es
The “427 switeh allows selection of the optimum
load resistance for a MM (moving magnet type)
cartridge on the turntable connected to the
PHONO-1 or -2 terminals, and the "pF" switch
allows selection of the optimum load capacity.
* Refer to “CARTRIDGE LOAD SWITCH” in
Page 15.
Ssvwitehss
These switches are used to put ON and OFF
the output signals from the PRE OUT Terminals
1 and 2.
To turn them ON, push them (as) and to
turn them OFF ( A), give another push.
Control
Turning it to the right produces a decrease in
the left channel sound volume, and turning to
the left, a decrease in the right channel.
To bring the left and right channels in balance,
push the “MONO” MODE switch and so adjust
this knob that the sounds from the speakers,
left and right, can be heard from the center posi-
tion between them. Then, push the “STEREO”
MODE switch,
Plug the power supply cord to an AC Socket
outlet, When the amplifier is connected to
a power amplifier and/or to a turntable, do not
fail to fully turn the VOLUME switch to the left
(9) before switching power ON.
* Switching power ON makes the lamp housed
in the switch button lighted. (Fig. 1)
Fig. 1 Connection of AC Power
Connect the PRE OUT-T terminals to the INPUT
terminals on a power amplifier by means of
connecting cords. Note that L and R are correctly
connected as shown |
Three PHONO input terminals are provided for
MM and MC cartridges.
Connect a turntable with MM (moving mag-
net) cartridge to the PHONO-17 and PHONO-2
terminals.
in case of MC {moving coil} cartridge, connect
the output cord directly to the PHONO-3/MC
terminals. |
When connecting, confirm L and À of the pin plug
provided at the tip of output cord from a turn-
table, and then connect a turntable with MM
cartridge to the PHONO-1 or PHONO-Z terminal
and a turntable with MC cartridge to the PHONO-
3/MC terminal. (Fig. 3) |
if a ground cord is provided together with the
pin plug, connect it to the GND terminal on the
rear panel.
Fig. 3
Ground Cord
Turntable (В Turntable (2) Turntable 43)
{with à cartrides, {with à cartridge, {with a MC cart
MIRA, E, MAL, eto) MBA, IM, MI, eto) ridge}
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8 Playing DISC
1) Please note that connections are right.
2) Push the POWER switch “ON”.
* The VOLUME control will be fully turned
to the left (ce),
3) Set the PHONO INPUT selector switch on the
front panel to the position corresponding to the
input terminals to which the turntable is con-
nected, |
* For example, set the PHONO INPUT selector
switen to the “FHONO-17 position for the turn-
table connected to the PHONO-1 terminal.
Set the INPUT selector switch to "PHONO".
For a stereo disc, push the “STEREO” MODE
switch, and for monaural disc, the “MONO”
MODE switch.
6) Push the TONE BYPASS switch button if
bypassing the tone control circuit is desired.
* In this case, all such controls in the control
G1 Zi
circuit as BASS, TREBLE, and TURNOVER
FREQUENCY BASS and TREBLE as well
as LOW and HIGH FILTERS do not func
tion,
7) Push the “17 or “2” PRE OUT switch button
to select a power amplifier connected, and
bring the amplifier into operation.
Commence DISC playing.
Turn the VOLUME slowly to the right and
obtain desired sound volume. Also work on
BALANCE control so that the sound volumes
of left and right speakers are equal.
When using a MM cartridge on the turntable,
set the “12 SWITCH of PHONO-1, -2 CAR-
TRIDGE LOAD so as to best meet the car
tridge's impedance.
Also by means of the “pF” switch, select the
optimum load capacity,
© ©
10
es
11) When the TONE BYPASS switch is left in the
OFF position, the tone control circuit func
tions. So, use such controls at choice as BASS,
TREBLE, and TURNOVER FREQUENCY
BASS and TREBLE.
The FILTER circuit keeps also functioning,
therefore cut off unwanted noise components
by pushing the HIGH and/or LOW switch
according to a disc program.
* Since the LOW switch is cut off ultra low
frequency components below 15Hz out the
audible range, vou may leave it in the
15Hz position (— } so that it works as a
subsonic filter.
12) When you discontinue disc play, turn the
VOLUME control to the furthest left (се),
pring the disc play to a stop, and finally
push the POWER switch OFF.
“ The “pF” switch in PHONO-1, -2 CAR-
TRIDGE LOAD presents stray capacity de-
licately varying according to length of the
output cord of a turntable connected and
with the material of the cord,
In principle, use the “M” switch to achieve
impedance matching for a cartridge to use,
and use pF switch to make choice of a
delicate tone variation in the high frequency
range.
Connect the tuner output terminals to the C-4
TUNER input terminals on the rear panel, using
the pin-plug cord provided, Make sure to confirm
that the left-hand and the right-hand outputs are
connected to the proper input terminals. To
enjoy your tuner, set the INPUT selector switch
to TUNER position, and operate the tuner to
receive the desired AM or FM signal.
Then, follow the procedures 5) to 12) for playing
DISC.
Fig. 4 Tuner Connection
— INPUT :
TUNER AUX
TUNER
CEPA nee amare a Tear
i A
ен овен:
The output cord provided with the Tape Deck are
used to connect the deck LINE OUT terminals to
the TAPE PB terminals. Use the TAPE 1 terminals
for your main deck, Use the TAPE Z terminals for
a second deck or as a spare pair. Set the INPUT
selector switch 10 TAPE 1 to play back tapes (or
to TAPE 2 if you are using the TAPE 2 terminals,
of course}.
The tape-deck cord provided are used to connect
the deck LINE IN terminals to the REC QUT ter-
minals. Again, you should use the TAPE 1 termi-
nals for your main deck, keeping the TAPE 2
terminals for a second or spare pair.
Note that the INPUT selector switch setting
has no effect whatever upon the signal which
will be recorded via these terminals. The REC
OUT terminals’ signal is decided by the REC
OUT selector switch.
Fig. 6 Tape Deck Connection
ТАРЕ РВ
LINE OUT
- me - ra LA
я
; LINE OUT
LINE IM
À program source from the REC QUT terminal
can be recorded irrelevant to the program selected
by the INPUT selector switch. For example, you
can record an FM broadcast by placing the REC
OUT selector switch in the TUNER position (Fig.
6) or dub a tape while listening to a disc through
speaker.
Typical examples:
INPUT | REC OUT
Selector | Selector Speakers
Switch Switch
You can record an FM or AM
PHONG | TUNER broadcast while listening to a
disc through speakers.
ap You can record an FM or AM
TUNER | TUNER broadcast while listening to it.
You can listen to a disc
PHONG | PHONG through speakers while record-
ing it.
You can record a disc while
TUNER | PHONG listening to an FM or AM
broacdcast,
By matching other positions of the REC OUT and
INPUT switches, you can enjoy various other pro-
gram sources,
With the REC OUT selector switch in the OFF
position, the C-4 1s completely disconnected from
the recording output terminals. Thus, when you
are not recording, the C-4 will be protected from
any adverse effects of unused tape deck input
circuit impedances. Use this position when not
recording.
Recording One Program Source While
Listening to Another
Fig. 6
Rec Out Selector & Input Selector Setting
РЕ СТ
iNET
PRO
TUNER
OFF
PHOMO UNER
/
APE TAUX
TADE
COPY
mE
PVP
РЫСИУО
|
en
TT
18
i
i
The C-4 provides for dubbing from tape to tape
with the tape decks 1 and 2 connected to the
TAPE-1 and -2 terminals respectively, To dub from
the tape deck 1 to the tape deck 2, place the REC
OUT switch in the TAPE COPY 1» 2 position as
shown in Fig. 6, and operate the tape deck 1 in the
playback mode and the tape deck 2 in the record-
ing mode.
* To dub from the TAPE-2 to the TAPE-1, place
the REC OUT switch in the TAPE COPY 2 №1
position, and operate the tape decks 1 and Z in
the recording and playback modes respectively.
Fig. 7 Rec Quí Selector Seftina
REC OUT
OFF
TUNER {
x
PHONO
This is a spare input for any sound source you
wish to connect to the C-4. When connecting a
stereo source to these terminals, insure the left-
hand and the right-hand plugs are inserted in the
proper terminals.
This input has a sensitivity of 180mV, and can be
used for such inputs as mic mixer amplifier, 6-
track tape deck,
Fig. & Auxiliary Input Connector
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MIC MIXER, etc. в |
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Plug the headphone into the headphone (PHONES)
jack on the front panel, You can listen by head-
phone when the PRE OUT switch (1, 2) set to the
OFF,
Please notice that the headphone's left and right
are rightly on your ears when using it.
Adjust the LEVEL knob to control headphone
level.
Headphone Connection
Fig, 9
Stereo Headphone
* Notice that headphones will not function when the
volume knob stays to the furthest left,
“ain aa
a o
Fig. 10 Sieear
4
THESE
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4
100 SOC
® BASS CONTROL CHARACTERISTICS
Response (de)
v TREN
Fesponse (de
TURNCER TASBLE
EMEQUENDY kHz
ACE]
Frequency (Hz)
LE CONTROL CHARACTERISTICS
Frequency (Hz)
sound quality considerably varies due to the
conditions of a room where sound reproduction
is made. These tone contrals are the control cir-
cuits exclusively designed for compensating this
sound quality according to your preference, in
the low (BASS) and high (TREBLE) frequency
ranges independently. (Fig. 10)
B BASS (Low Frequency Tone Control} can be
achieved by means of the BASS control and
the TURNOVER FREQUENCY BASS control.
® The BASS control produces the greater
volume increase in the low frequency the
further it is turned to the right, and the
greater decrease in the same the further
it is turned to the left.
@ The TURNOVER FREQUENCY BASS cont-
ral varies an turnover frequency in the range
from 100 to 500Hz, The further it is turned
to the right, the greater increase in the turn-
over frequency is achieved, and the further
it is turned to the left the greater decrease in
the frequency is produced,
TREBLE control. (high frequency tone con-
trol} can also be made in the same manner
as BASS control.
BASS and TREBLE variations effected by the
controls are shown in Fig. 10.
Once the TURNOVER FREQUENCY BASS
and TREBLE controls are used, a greater
change in the high and low frequency charac
teristics is produced for even the same extent
of turning of the BASS and TREBLE controls.
As above described, the C-4's tone control
circuits make diversified and delicate tone
control possible.
Fig. Ti Tone Bypass Switch
BALANCE
INPUT MODE pp
INPUT SIGNALS
FROM A RECORD
ON when pushed
{fightad inside}
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| DC FLAT AMP. 7
„VOLUME 7
RR FE Hat SHE TE GRR Er
The TONE BYPASS switch is unique in that it
directly connects the excellent equalizer amplifier
and the DC flat amplifier,
As is shown in Fig. 11, when the TONE BYPASS
switch is put ON (Le. when the push-button is
pushed and the lamp inside is lighted on}, the
output from the equalizer bypasses the tone
controls and filter circuits and directly reaches
the flat amplifier,
Thus, the output signals can be sent to the
amplifier via the much simplified circuit con-
figuration.
When two different program sources are connect-
ed to the amplifier and when two power amplifiers
and/or two pairs of speakers are in use, this
“TONE BYPASS” switch allows easy switching
over for either flat characteristics or compensated
tone characteristics at your option to better meet
a program. |
While the TONE BYPASS switch is ON (Le.
while the lamp lights on}, neither the tone con
trols (BASS, TREBLE, TURNOVER FREQUEN-
CY) nor the FILTER switches do function.
Here, also note that putting the TONE BYPASS
switch OFF (Le. putting the lamp off} badly
influence the speakers when both the VOLUME
control and the TURNOVER FREQUENCY BASH
control are turned to the furthest right (Le. Tully
clockwise) or when the LOW FILTER SWITCH
is left in the OFF (JH) position,
Generally speaking, the PHONO terminal of which input
impedance fails to match the cartridge’s load resistance
value has bad influence upon the sound quality repro-
duced. The C-4 is equipped with the "7 SWITCH vwhich
can be switched over in five steps in ali, 10060, 33k17,
47k0, GEKO, and 100ke, so as to fully meet the load
resistance value of a cartridge in use, Changes in frequency
characteristics effected by the switch is shown in Fig. 12.
in addition, the "pF" SWITCH on the C4 permits also
five-step switching over the load capacity, Le. 100pF,
150pF, 220pF, 330pF, and 470pF. Frequency character.
istics changes due to positions of the switch are shown in
Fig, 13,
* Que to the type of a cartridge in use, the amplifier’s
frequency characteristics vary to some extent, So,
please choose such a switch position as to meet your
preference in the tone quality. This switch further
enables selection of the optimum stray capacity value
or its compensation, of the output code connecting
the cartridge and the PHONG input terminals. To
achieve this selection or compensation, just follow and
so set a load resistance value and turntable's cord
capacity specified by the cartridge manufacturer. This
capacity specification, however, may not be available
in many cases, IT not, please play a variety of discs to
determine the optimum switch position to produce
the type of sounds as you like,
Thisalso means that using a load resistance value other
than the manufacturers specification on purpose
makes creation of different sounds possible.
*1, Usa a possibly shortest cord to connect a turntable
and the amplifier. Also, use of a low capacity cord is
recommended,
“2 The cartridge load of 1000 represents a position for
a low impedance high output MC cartridge.
«3 Please notice that cartridge load switching is impos.
sible with the PHONO 3.
$ HAPEDANCE SWITCHING OVER & CARTRIDGE FREQUENCY CHARACTERISTICY
Fig,
12
Response (dB)
148
Frequency (Hz)
PHONO.1-2 Cartridge Load Switches IN
FHACNO- 122 CARTRIDGE LOAD
Dr
150 220 330
E CAPACITY SPATCHING-OVER & CARTRIDGE FREQUENCY CHAHACTEMBSTICS
Рю.) РН 1
13
Response (dB)
i ПЛК de
Frequency (Hz)
AUX, TUNER, TAPE PB-1, 2 to PRE OQUT.1, 2
0.005% (at 10V output)
Signal-to-Noise Ratio (IHF A-Network)
85d5 (input shorted,
rated output level}
PHONC-1, 7. 2.5mV/1000 - 33k0 -
4752 - 68k0 - 100ko
Capacitance: 100pF -
1508F - 220pF - 330pF
boe
PHONO-3/MC 1004/5008
AUX, TUNER, TAPE PET, Y 150mVv/47k0
Maximum Input Levels
PHONO-1, 285mV at 0.01% T-H-D
FHONQ-3/MC T1Omv ar 0.02% T-H-D
AUX, TUNER, TAPE PB-1, 2 B.2V at 0.01% THD
Output Level/impedance
REG OUT 1,2 150mv/15800
PRE QUT 1,2 2.0V/6009
PHONES OUT 18V (at open load, 0.05
RIAA Daviation
PHONG, 2 7308 {input open, cart-
ridge load: 47 ko rated
output level)
748 {input shorted,
rated power}
PRHONO-3/MC
AUX, TUNER, TAPE PB-1, 2
~ TONE BYPASS: ON — — 10606
— TUNE BYPASS: OFF — 10006
Residual Noise O2uV
Fregqueney Response
% T-H-D} /3300
AUX, TUNER, TAPE PB-1, 2 5 to 100kHz:0.5dB
Maximum Output Level (20 to 20, 00062)
Tone Control Characteristics
REC OWT 1, & 15v {0.01% T-H-D)
PRE QUT, 2 10V {0.01% ТН)
PHONES OUT 18V (at open load)
Bass Turnover Frequency 100Hz to SOOHz
+ 1006 ar 20Hz
Bass Boost/Cut
Total Harmonic Distortion Ratio (20 to 20,000Hz)
Treble Turnover Frequency TkHz to BkHz
PHONO-1, 2 to PRE QUT-1, 2 (Vol. —30dB)
0.0035% (2V output}
Treble Boost/Cut 11008 at 20kHz
Filter Characteristics
PRHONC-3/MC to PRE QUT.1, 2 (Vol. —d0dB)
LOW FILTER 15Hz, 12adB/oct
0.1% (2V output}
HIGH FILTER 10kHz, 12d5/oct
AUX TUNER, TAPE PB-1, 2 to PRE OUT-1, 2(Vol. max)
Channel Separation
0.0035% (TOV output)
PHONO-1, 2 to PRE OUT-1,2 85dE (Vol. —30dB .
PHONES OUT 0.02% (12mW, 85)
TkHz - 5.1k07 shorted)
IM Distortion Ratio
PHONO-3/MC to PRE QUT-1,2 B5dB (Vol. —30d6 -
kHz - Of shorted)
AUX, TUNER, TAPE PB-1, 2 to PRE OUT 1,2
B5dB (Vol, —30dB -
1kHz2-5,1 ко shortec}
—20dB
GENERAL
Power Supply
120 AC, 80H:
Power Consumption
BOW
Dimensions (WxHxD)
455x1 16x376mm
{17-1 87 xt4-1/27)x
(14-3/4)
Weight
BL8kg {18 1b 15 oz)
Specifications subject to change without notice,
DOCADTODI BALANCE
| CARTRIDG | TONE AUDIO PREOUT
= - ee) PRE OUT 1
#
Mi,
PHONO-1 G LOAD | INPUT MODE
~~ MUT INGIT
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DD
PHONO-2 [email protected] 4 Pa | Lo”
= INVERSE / / | | FLAT AMP /
|RIAA AMP en
PHONO-3/MC O—
MC HEAD
| LOW FILTE =
| |
AMP |
AUX ©
YY
1 40
BASS TREBLE
BASS TREBLE
TURNOVER TURNOVER
TUNER ©
— TAPE PB ©
TAPE-1
— REC OUT @——
~ TAPE PB © y LEVEL HP AMP
ТАРЕ- 2 REC OUT -
PHONES
|
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1
FIER TERY
E ES
Pauit
Cause
Cure
No power although POWER switch is ON.
AC power line not plugged into supply socket,
Plug it firmly into the supply socket,
Power remains off despite of AC supply through firm con-
rection.
Contact your nearest Y AMARA dealer,
Mo sound although INPUT switch is ON,
INPUT selector switch in wrong position.
Check and change as necessary,
VOLUME too low,
Turn up VOLUME.
INPUT pin plug incorrectly inserted.
Check and insert it fully in correct position.
OUTPUT cord’s defective connection.
Check and make good.
PRE GUT switch in OFF position.
Set REC OUT switch to ON position.
No sound from both speakers, or sound only from either
Lor A speaker.
Defective connections between control and power-amplifiers,
ог between power amp. and speakers,
Perform correct connections, or check operations.
Balance control not properly adiusted.
Set it for correct stereo balance,
Sound suddenly ceases during audition,
Speaker protection circuit ton power amp.) at work, having
Power amp.'s potential lowering to OY, relay operates to fead
то speakers.
Turn power amp.'s power switch OFF, anda short time after
turn it back ON.
Trouble with circuit itself,
Contact your nearest Y AMAHA dealer,
Poor bass response and inferior stereo Image.
Adversely connected phase polarity (+, —) between power
amo. and speakers,
Achieve correct connections.
Sufficient volume unobtainable through VOLUME control.
AUDIO MUTING switch remains ON.
Switch it OFF and readjust VOLUME.
Loud ‘humming occurs during record audition,
Defective connection of PIN PLUG.
Plug it in firmly,
Turntables ground cord not connected to amp.'s GN terminal.
Reception of amateur or private station mixed with desired
reception,
Connect ground cord to GND terminal on rear panel,
Such stations located in vicinity.
Consult with your YAMAHA dealer.
Consult with such stations.
Loud ‘howling noise when raising VOLUME during record
audition.
Speakers and turntable are positioned closely.
Give a proper space between speakers and turntable. Ш
MO cartridge delivers low sound volume.
MO cartridge output cord connected to MM terminal
(PHONO-1, 2)
Connect it to MC terminal (PHONO-3/MC)
Fass and treble controls have no effect.
EILTER switch has no effect.
TONE EY PASS switch remains ON (amp is lit),
Turn switch OFF, as it is left ON (lighted) tone control and
filter circuit are not operative.
SINCE 1887
МРРОМ САКК!
CO, LTD. HAMAMATSU, JAPAN
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