Ampex 351 - Page 95

ELECTRONIC ASSEMBLY
SCHEMATIC DIAGRAM
I2AX7/ECC83
iff
1R23
8200
275
6201
1R105
100K 2
1U
5J1
i-8.5|
4R1 t
100K>
-80 4R9
100>
■12B TO A|
26 1R21
220
1R8 <
1MEG?
E°
iff:
J5o 5 :
452b
i LOW
0
CCIR EQUAL ONLY
<A
4S2s
I2AX7/ECC83
3R35
27K
Iff
1B0
.1 ’ 0
ns
2R42S
220K?
s ; sj
2V4b
, 110 >
2R46
1000 El]
-68
V
J
13
RED
STS?
tel
to
de 2R41
1500
BLUE
2R33 5
10MEG?
m
7mr ;
2R4S
39K
1?$-
tthf
295
SEE NOTE 4
PLAYBACK !
LEVEL |
TABLES
O-
I2AU7
|4M1
VU
SPARE
300
F
REC.
300
RECORD,
REC.
3
4S3c
3K10
| INTLK
117VAC
r< 8
117VAC
2
r
3C16c • 3C161 -
20 ^75
450V ’ 450V '
3C2i I-
20
450/ -
2
RED
[f
1R65
220K
300
5
SPARE
INTLK
RED
REC
-)F
4
.GREEN
REC
3
5l
117 VAC
id
9
<713
SWITCH 4S1 IN MICRO 
BLUE
•BLUE
Tmr
8-23 8-24
|UE1I
2
; redael I
5J7
TAPE TRANSPORT
t ----- 1
I2AX7/
ECC83
4S6
RECORD BUTTON
2C19
.02
500V
Hi-
fi
' BROWN
I2AU7
A 2C15
*1R18 A 1C8
------ [(-
-M-|-
4C43j^
10 •T'
150 V ‘
4R70
330
‘ HP
1R59
1500
2W
>T 2 v
RECORD
LEVEL S'}
5C25 T
.0047^
600V I
-AAA-
1R6 ,
100K|
■Iff
1W
WHITE
J
BLACK
3Klc
3V7
6X4
IVsbl 3 .
MICROPHONE J .
BALANCEoPK
BRIDGE O l O-
4K3
BIAS
COUPLING
RELAY
RECORD
RELAY
3Kla
750pF
150K *1>
TJ3K1
KRECORD
J RELAY
RECORD
LICHT
5C13
15-130pF
175 \0
BIAS
ADJUST
TABLE 1
NAB EQUAL I .
REF I 3-3/4 7-1/2 [
| NO. | 30960 -02-04 |
C46
I C7
C8
R29
R30
REF
HO.
C46
C7
C8
R29
R30
C15
R18
| 780-2 110pF~
550-1600oF
.02 *5%
10 MEG
500K ______
750pF
150K 1 1>
30960
-01-02-07
6TS3
SEE NOTE 5
PHONES
IZATION ______
7-1/2 15
30960-01-03
550-1600pF
100-550pF
.02 *5%
8.2 MEG
• jumper
FOR
I 30960
-01-03
ONLY
3C29
.01
1000V
.BIAS
CALIBRATION
-L- CIRCUIT GROUND
■gfr CHASSIS GROUND
Q DC VOLTAGES
I — I SIGNAL VOLTAGES
30960
-03 04-08
METER AND OUTPUT
SWITCH
PLAYBACK,
HEAD
1
3C30
.01
I000V
3R60
1.5
1W
POWER
2R47I
15K >
6T3 Y ELLOW 1
ado
1V6
12AU7
b ™ w we °°
i
GREEN
?
LEGEND
THE FIRST NUMBER OF THE SCHEMATIC REFERENCE
NUMBER SIGNIFIES THE LOCATION.
1. RECORD AMPLIFIER BOARD
2. REPRODUCE AMPLIFIER BOARD
3. POWER SUPPLY BOARD
4. FRONT PANEL OF AMPLIFIER CHASSIS
5. BACK PANEL OF AMPLIFIER CHASSIS
6. SIDES AND BOTTOM OF AMPLIFIER CHASSIS
UT TRANSFER
ITCH
Iff
TABLE 1
CCIR EQUALIZATION
7-1/2 15
30960-07-08
275-970pF
275-970pF
■ 068 *10-.
10 MEG t5**»
500K _________
.0012 <5-.
120K *57.
2 £} 8 . . 2R43>
500 v T 220K f
CIRCUIT CONDITIONS
EQUALIZATION SWITCH 4S2 IN 7 f ’
POSITION 500 CYCLE INPUT.
LEVEL CONTROLS 4R9 AND 4R36 FULL
CLOCKWISE. LINE OUTPUT 5J5 TERMINATED
IN NOMINAL 600 OHMS . OSCILLATOR TUBE
1V6 REMOVED.
1,000 OHM RESISTOR SUBSTITUTED FOR
RECORD HEAD.
INPUT TRANSFER I
PHONE POSITION.
RECORD RELAY 3X1 ENERGIZED.
LM
POWER CIRCUIT FOR
30960-01-02-07 A,
MASTER ELECTRONICS p
BIAS
COUPl
5 J 9 a
fl
"2d
X
__ t —
*EE TABLES
SHI
me? gJlL
lie?
5J2
RECORD
HEAD
lC2c -
10
450V -
F redael
it-OGREENAEL
— 456
fl
4C23b I
.001
500V
‘ 1 ’ * I ww ]
3C27
.02
5007
558
iw 5
fl 
fl ”
4C37
.01
500V J
T r ECORD BUTTON
sXf
POWER CIRCUIT FOR
30960-03-04-08
SLAVE ELECTRONICS
0*1C46
fl
8?
it lC2b
-T 20
_L 450V
BIAS j ’ ERASE
>O --------
PLAYBACK
kCRljcjJ +
1 4000^
15V -
NOTES:
1. RESISTOR VALUES ARE IN OHMS *107.
1/2 WATT UNLESS OTHERWISE SPECIFIED.
2. ALL CAPACITORS ARE IN MICROFARADS
AND RATED AT 400V. UNLESS OTHERWISE
SPECIFIED.
3. SWITCHES ARE SHOWN AS THEY FUNCTION
NOT AS THEY ARE CONSTRUCTED AND WIRED.
4. FOR UNBALANCED OUTPUT WITH ONE SIDE
GROUNDED, CONNECT A TO B AT 5TS2 OR PIN
ITO PIN 2 AT 5J5. FOR BALANCED OUTPUT
WITH CENTER TAP GROUNDED CONNECT G TO
HAT 6TS1.
5. JUMPERED AS SHOWN VU METER IS
CALIBRATED FOR * B VU OUTPUT. FOR ♦ 4
VU OUTPUT JUMP £ TO F INSTEAD OF E TO D
ON 6TS3 (SEE INSTALLATION). READJUST
RECORD CALIBRATION CONTROL AS DESCRIBED
IN SECTION V OF MAINTENANCE MANUAL.
6. DC VOLTAGES MEASURED WITH 20,000
OHM PER VOLT METER WITH EQUIPMENT
IN RECORD MODE AT 117V LINE.
TO .78 VOLTS.
iK, ^n
XM
2R31
100K
1C35
350pF
500V
r
■4(
2C21
.02
500V
1 5*00^
6R52
8200
*5%
5J7
TAPE TRANSPORT
2C22 4C23a
50V MONITOR 500 V
n yr
EQUAL 1 "
__ _ SWITCH
Q 1 0 L0W 4S2 c
T^2R30 Q * s O — -
Hip A
5C24 J,
.0047T
600V |
record "
CALIBRATE
IS EF
2C14 - 350V
WW 02
x — x 500V " C
(lOOji --------- 1( -----------------------
2V3b
" 0TE:
C39MAY BE ELIMINATED IF NECESSARY.
3C16bI-
15
ERASE
’ LING HEAO
-rr?
ERASE
5 C33 ADJUST
100-
5C34«' I
.00091
’ ’ 500V
* -i-
5F1
1/2A
SLO-BLO
IVlb
4 — j
6T4 ^ l .
IK
1C32 T
350pF lV6b
7^500V L
R63 4700: ^^8
!ovp
" ^ ? 5 lV2b
I 500V [717
-ir —
5J8 xis.
.... ACIN/>**\
loo" xd "° “ E "
hi -------- -J —
5F1
1/2A
SLO BLO
-)l ---- 1
5C39
33pF SEE NOTE
iff -"i
2V4
12AU7 12AX7
12.DC7 12AX7
--fl'