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