MODEL
351
ELECTRONIC ASSEMBLY
VARIATIONS IN
CIRCUITRY
fOR
CCIR
EQUALIZED elECTRONIC
ASSEMBLIES
FROM
THE
STANDARD
NAB
EQUALIZATION.
RECORD
BOARD-
1.
An
additional equalization circuit comprised
of
a 20 millihenry choke
(ILl);
.0024 micro-
farad
capacitor (1 C
11
),
is wired across 1 R22
through
contacts
of
switch
4S2B as shown
on
schematic
diagram
30961.
2.
1C8 is
changed
to a .068
microfarad
capacitor.
3.
1C46
and
1C7 are both
changed
to 275-970
microfarad
adjustable capacitors.
For
the
location
of
these
components
see
Figure
1
of
this section.
REPRODUCE
BOARD-
1.
Capacitor 2C15 is
changed
to .0012
microfarad
and
the
jumper
between
2R30
and
2R31,
is removed. Variable resistor 2R30
(500K)
is utilized for CCIR equalization.
Ref.
No.
1C7
1C8
1C11
2C15
1C46
ILl
2R30
For
the
location
of
these components see
Figure
1A.
CHANGES
AND
ADDITIONS
MODEL
351
COR
PARTS
LIST
ELECTRONIC ASSEMBLY
CATALOG NUMBER 30960-05
AND
-06
Part Description
Capacitor, variable: 275-970 pF, 175 V dcw: El Menco
Part
No. 306 Type 30
Capacitor,
paper:
tubular, .068
uF,
10%,
400 V dcw: Sprague
Part
No. 89 P 68394
Capacitor,
paper:
.0027
uF,
5%,400
V dcw: Sprague
Part
No. 89 P 27255
Capacitor,
paper:
tubular,
.0012 uF, 400 V dcw,
5%:
Sprague
Part
No. 109 P 12254
Same
as 1C7
Choke, air core: 20 MH
Resistor, variable: .5
meg
ohm,
30%,
%
W:
Chicago
Telephone
Supply
Part
No. Type UPE-70, Spec. 31184
Reproduce Board Assembly
Record Board Assembly
Harness
Assembly
(Master)
Harness
Assembly
(Slave)
1 -1
Ampex
Catalog No.
038-003
035-299
035-298
034-203
038-003
30767-01
044-207
30962-04
30963-04
30966-01
30966-02
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