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Ampex 300 - Page 8

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SCHEMATIC
DIAGRAM
ELECTRON IC
ASSEMBLY
MODEL
351
45·1
I
V-Ih
INPUT
TRANSFER
S\V1TCH
MJCROPHONErQ~
______________
~I~'A~X~1~/~E~C~C~'3~~
CCIR
EQUALIZATION
BALANCED
I
~b----------------------------~~
BRIDGE:
·6
~------~I
SJ-l
'"
-7".
UNBALANCED
I
#.
LINE
('I~~)
I I
"lOOK
I
I~
15
L-.-l
' 1
r...l:,
IV-I;:!
12AX7!ECCf<:j
1
v-2b
12AT7
IV-2a
IR-19
Q
12A'J'7
22
K
IW;;:::,)
IR-23
8200
CATALOG
NUMBER
0-30961
G
1
lc-wl
5C-IJ
30960
4 I I
'4R-l
>-
BRlDGE
\rj'
r-~,\
,'o~-~;'
IC-I"
O
INPUT
F-,L;-
V'n-~\
-+--}----1Ir-+-...,
I B
.T-~3
.~-n-·
-74.S
~~-~L
r--"{fi
'n'
Kt,
'R-'~-)'"
',RO-O'
~~-:
L-+--<l:'
•.
2;~0
>-
.'1
T
J:i2BToAl
15
- 130pF
L-_~~~~~~
__
-._~"U5~~V~.
___
..
_______
__
R:~~RD
~
I
1i:]ST
3~3WI
T
NOTES.
\.
RESISTOR
VALUES
ARE
IN
OHMS
1O'b
In
WATT
UNLESS
OTHERWISE
SPECrF'l:ED.
2.
ALL
CAPACJTOR5ARE
IN
.MlCRO~
FARADS
AND
RATED
AT
400
v.
UNLESS
OTHERWISE
SPECl
fI
E
d.
3, S\.Vl'TCHES
ARE
SHOWN AS
THEY
fUNCTION
NOT
AS
THEY
ARE
CON-
STRUCTED
AND
WIRED.
4.
FOR
UNBALANCE?D
OUTPUT
WITH
ONE
SOE
GROUhUED
CONNECT
A
TO
BAT
51'52
OR,P1N
1
TO
PTN
2
AT
5J5.
FOR
BALANCED
OUTPUT
WITH
CENTER
T,A.P
GROUNDED
CONNECT
G
TO
H
AT
61'81.
5,
JUMPEREDAS
SHOWN,
VU
METE:R
IS
CAUBRATED
FOR
+ B VU
OUTPUT
FOR
+ 4
YU
OUTPUT
JUMP
E
TO
r'
INS'TEAD
Of'
E
TO
0 ON'
6TS3
(SEE
INSTALLATION).
READJUST
RECORD.
CAW8RATTON
CONTROL
AS
DESCRlSEO
IN
SECTION
V
OF
MAJNTENANCE
MANUAL.
6
D,C,
VOLTAGES
MEASURED
WITH
20,000
OHM
PER
VOLT
METER
WITH
EQUI
PMEN'l'
1 N
'RECORD
MODE
AT
It7V,LJNE.
~GNA
L.VOL
'rAGES
MEASURED
WI
TH
AC
VTVM
AND
EXPRESSED
IN
db
REFERRED.TO
.76
VOLTS.
crRCUlT
CONDITIONS
5J-7
2R-25
330
I<
'rAPE
TRANSPORT
INTERLOCK
4
.,
2
'R
3
.>
'----0-'
l'li
IR-'
4R-9<
100
>
~
~
I MEG
100
K<
2R-ZIl
1!500
1'(,
4R-36
250 K
~S-3a
I
I
I
I
12R-31
II
MEG.
I
4CR-2
PLAYBACK
I
__
~~~
____
,
LEVEL
I
HEAD)~
\
~---------------------------
45-28
CCIR
EQUAL.
ONLY
2
40
(SEE
TABLE
I)
~
2R
47
lC
22
R-
2V-4a
2V~4b
15-
K
.1
50V
5J-4
82
K
I2AX1!ECC83
12AX1!ECC83
295
Jo.AA
J
f-vMONITOR
~o~
".I~
""
'j':'"
r
C'
J!.
\"'~
50g
2
V'"
220
K
,0'
~
~lROWN
6T
il
-;C
3
-<>-Y:..:E::L::L::.O:..:W,
________
....
-.:-
____
.......
..-_
.....
."..""i-_____
...
V"":.r.._-
__
~~,
~
::0,:
:R'-4.
~\
6_:,
BLACK
T~~~~
~_;
'4h'3
)51
2{
- \
90
.02 8 -
UNE
2 n r
\"
~~:
,
.....
_+_5-100I-V~
......
-+
__
'1M
13
~
GREEN"
5R56~8
>-
OUTPUT
I
0i
-
~--
-
4=
h~,
-~
-:
j'
RED/YEL.
~61TSH-1
:l-5T&-B
2
7TJ'rrr
~~o7i
0-:e
~.
'¥@
BLUEbD~R<EEN/YEL'
"
2
..
'
~
2H-39
2H-41
2C-20
2R-45 2R-46
295
18
2R-49<>
1~00
> I MEG. 1!500
1l;'6~FV'T'
MEG 1000
~
39
K > SEE
NOTE'
,
____________
~=..::.:::-':___j--__,
I
BIAS"
-L
~
~'
2
/[L-~-8
LOy
16ll-s"g'
~
: !
~
---- --
~
------
r---------------~----------------------------------------------...J
- - - - - - - - - - - -
~~03~~4:08
-
~~~=~7
-
~}~E
--
4S-~
4K-3
I
lV-6
T1777T
COU?LlNG
II/If
;
flM-1
SPARE
5 POWER.
BIAS
COUPLING
RL_AY I
12AU7
L---f-----
..........
, V U
~,E,C~.
A.C. :
~~r2-,
...
1---5c-.-2-5t-t--f-J
'-_t-
____
.....
..,.~"'rr141~:
....
~_~..Ja
- - - - - - - - - - - -
-JB-:;~1,~.~r----,,-:;-:--:-:-~---
....
-~-::
1",,:~
- - - - -
--;
- - - - -
:,:~,~~
--~
- - - - - -
~,-roJ""
.~
""
,::~.!
j
!M~·
REC.
111
v.
A.C·
I
-'
6~~~16gf\
f-:'
l.
s
_
6
:
~'i"i.c;,,~D
6T-"EL.
!~-:
330
I,~~O
I~~O
31~
~
3'5~-3;
I
,;~.
~
330
fX
Ic?8is
3
s
3
0 I
PLAYBACK
H?~
I A .A';" I
I'!
~
,00\'"
6
,....2T-S
X
pF
lanK
AND
OUTPUT
lei?
7
.1
I~EL3
4 7 'YO
__
~',2500V-T-5%5
'R
OOV
·
l
7!\/:~__
x 1 SWI"PCH
L-'"!0L-.
BI..AyCK
3C
2 t
__
,
r-.
5C-34
-,,-
J
RE~
,t"J.
"~O~"I
3C
I.
+ 3 +
f;-"
4
'
700
R
-
61
'>
~R700-62<
B
1I'--~7.,..-----.....;;5:.·.~::..,o-'g:.:::g:.:::6:!V-----------------....l
~
45~OV'
T.J
-
~i1:d:'T-
-,
,
~~",~""'..J
1
lR-"
POWER
CIRCUIT
f'OR
309:0E~g3RD-~~'f"T'°68
RED/YEL.
1,Ro-6K3~r
8A""'LA
1S
N
E
C'
E
~,%w2
~41-1
RECORD
(SLAVE
EU:CTRON1CS)
-
t-':a-.;...;.;;.;..--t--
...
--+---t---.,.-
..
---
..
-
....
-
__
~:.;.~
..
I.::::.:;::,;::;.::O-_--I-----..!.::~~~+D
UGHT
,...-<J\.
'R-56
3C-29
lC-2c
T_
- T
.
SF'~:;Z
1/2
A
5;L~
BLO
100 ,01 10
-..J.:"
-:!:-
lR-65
5./-7
311
Y Z RF.D
..;..
__
....
__
'0.t,00"
V.
450
VT+
-=
220 K
TAPE
TRANSPORT
r
I~
~~~R
WHITE
I :
3R-51
II~O~
INTERLOCK
6
~~
5J-B
~~I~~3cl
__
A·~10~0~-1~2A1wY-';~-;~
______________________
-4'--
____
~~~~
__________
~
_________________________
J
A.C.
IN
~
3K-IoI
>::-?
Y'
REC.
4
I--~
-~
1 Z
K-Ic
.o{c;~go
v.
6'"
TABLE
1
I
~
~
~
7 LEGE),iU
r-_r-N_A.;:8_E;..Q:.U;..A...;U:.:ZA;;.T:.':;:O;;.~:....
__
.,
9
'5
4 THE: FlRS'J'
NUMBER
Or"THE
SCHE.MATIC
REFERENCE
MACHINES
NUMBER
3GNIF'lES'f'HE
LOCATION
REF
3-3/4
-1-1/2
7-1/2
-
15
GREE:N'
SPARE
5 ,
NO,
J096O..o2,
-04
30960..o"
..o3
r--------+-o-L++-4--1
________
-+-4~~
__
---ff,3K-la
8QUAIJZA1'rON
SWJ'J'CH
482
IN
?~1/2
REe.
.:I I
?CanON
500
CYCLE
INPUT.
~
GREEN
YEL.
'5:=>
I
RECORD
AMPLlnER
BOARD
LEVELCONTROLS-4R9A.ND1R36
rULL
II'1V.
~.C.
2
~
CLOCK.WlSE.
UHf:
OUTPUT
5J5TER-
5C-2S
I
.MlNATED
IN
NOMlNAL
600
OHMS.
OSClL-
111
II.
A.C.
I
~
.0047
I.. r
RrCORD
LATOR
TUBr.1
V6
REMOVED.
'-
______
-L---l
SC
24
600
~-6
I
RELAY
I,OOOOHMRE:SlSfORSUBS1T1'U'l'EDfUR
.OO-47~-IV'
j
~_~
:
3K-l
l~EpCUOTR~RHA~"s~·ER.
SWITCH
451
IN
MICR,O-
fiOO·Y.,
r-
L56r~-~'v.
r
PHONE
POSlTlON_
RECORD
RE.LAY
.31(1
ENERGIZED.
NOTE:
UNBALANCE.
OF
2
db
MAY
BE
EXPECTED
AT
PIN
2
AND
PIN
1
Of'
2VS.
RECORD
BUTT()"""
POWER
CIRCUIT
rOR
30960-01
-02
-
07
MA5TE:R
ELE.CTRONlCS)
~GREEN~
e 4 5
~
BLUE"'1_2
4~:_60
BLUE:
1.S
2V-3
!v-2
lV-1
YEL.
J..
lW
A
12AX7
12Al'~
12AX7
8LUE
L
__
V
::._-'J;
.....
'
.......
+
_~.:.._4
....
9=--~=9
____
47~DC2.6
6CR-l
4000---r--
15
Y. r
5
2. RE".PRODUCE
AMPUF'lER
BOARD
3
POWER
SUPPLY
BOARD
4
fRONT
PANeL
OF
AMPLJFlER
CHAss.S
5.
BACK
PANEL
or
AMPUflER
O{A~SlS
6.
SlOES
AND
BOTTOM
OF
AMPUflEA
CHASSIS
..L
mh,-
O
D
CIRCUIT
GROUND
CHASSIS GROUND
o c
VOLTAGES
SGNAL
\l.OL
'fACES
R-·30
SOOK
OMIT
-BYPASS
S-2C
AS
SHOWN
WITH
DOTTED
~-4
________
~
__
~u~m~~

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