PREAMPLIFIER CIRCUIT DIAGRAM
FIGURE 5
PREAMPLIFIER PC BOARD
FIGURE 6
REPLACEMENT PARTS LIST
Reference Part
Commercial
Designation
Number
Description
Alternate
Al
90A8216
Printed Circuit Board Assembly
None
A2
R129
Microphone Cartridge & impedance Converter
None
C102, 107, 108, 110
86S628R
Capacitor, Electrolytic, 1 µF, 50 Wvdc
None
C103
86AE629
Capacitor, Electrolytic, 33 µF, 16 Wvdc
Mallory VTL33S25
C106
86W628R
Capacitor, Electrolytic, 15 µF, 63 Wvdc
None
D101, 102, 103, 105, 106 86A415R
Diode, Computer, 75V, 0.4A
TI, GE 1N4148
D104
86A8405
LED, Green
None
D107
86C429
Diode, Current Regulator, 1.3 mA
Motorola, Teledyne
1N5300
L1, L2 80A253
Ferrite Bead Ring
Stackpole 57-0180
MP2
53A1879B
Grille (Microphone)
None
MP3
37A147
Inner Screen (Microphone)
None
P1
95A8077
Connector, Receptacle, 3-pin Miniature
Switchcraft TB3M
P2
95A247
Connector, Receptacle, 3-pin
Switchcraft D3M
Q101, 105
86A350
Transistor, NPN
Motorola, National
Semiconductor 2N5210
Q102,103,104
86A348
Transistor, PNP
Motorola, National
Semiconductor 2N5087
S101, 102
55A8031
Slide Switch, SPDT
None
T1
51A286
Transformer
None
W1
C107
Cable and Connector Assembly
None
-4-
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