MODEL 300 MULTICHANNEL EQUIPMENT
VARIATIONS IN
CIRCUITRY
FOR
CCIR
ELECTRONIC
ASSEMBLIES
FROM
STANDARD
NAB
EQUALIZATION.
1.
The
30920 EQUALIZER BRACKET ASSEMBLY is removed
and
the
30761-01 EQUALIZA-
TION
SWITCH is
installed
in
the
same
location.
RECORD
BOARD-
a.
An
additional
equalization
circuit
comprised
of
a 20
millihenry
choke
(ILl);
.0027 mic-
rofarad
capacitor
(lC11)
is wired
across
1R22
through
contacts
of
switch
4S2B as
shown
on
the
schematic
diagram
30961.
b.
Capacitor
1C8 is
changed
to a .068
microfarad
capacitor.
c.
1C46
and
1C7 are both
changed
to 275-970
microfarad
adjustable
capacitors.
For
the location
of
these
components
see
Figure
1
in
Section
1.
REPRODUCE
BOARD-
Ref.
No.
1C7
1C8
1C11
2C15
1C46
ILl
2R30
a.
Capacitor
2C15 is
changed
to .0012
microfarad.
Variable resistor 2R30
(500K)
is
mounted
on
the
etched
board,
replacing
4R69 formerly located
on
the
bracket
as-
semly. Variable resistor 2R31
(WOK)
is
installed
in
place of fixed
resistor
2R31 (68K).
For
the location
of
these
components
see
Figure
1A
of
Section
1.
CHANGES
AND
ADDITIONS
300 COR
PARTS
LIST
ELECTRONIC ASSEMBLY
CATOlOG
NUMBER
30960-07
AND
-08
Part Description
Capacitor, Variable: 275-970 pF, 175 V dcw: EI Menco
Part
No.
306
Type
30
Capacitor,
paper:
tubular,
.068 uF,
10%,
400 V dcw:
Sprague
Part
No. 89 P 68394
Capacitor,
paper:
tubular,
.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
3 -1
Ampex
Catalog
No.
038-003
035-299
035-298
035-203
038-003
30767-01
044-207
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