Tektronix 434 - Page 119

Electrical Parts List— 4 34/R 434
A2 VERTICAL Circuit Board Assembly (cont)
Tektronix Serial/Model No.
Ckt. No.
Part No. Eff Disc
Description
Semiconductor Device, Diodes (cont)
CR433
*152-0185-00
Silicon
Replaceable by 1N4152
CR440
*152-0185-00
Silicon
Replaceable by 1N4152
CR521
*152-0185-00
Silicon
Replaceable by 1N4152
CR551
*152-0185-00
Silicon
Replaceable by 1N4152
VR227
152-0279-00
Zener
1N751A 400 mW, 5.1 V, 5%
VR327
152-0279-00
Zener
1N751A 400 mW, 5.1 V, 5%
Q200
*151-0281-00
Transistors
Silicon
NPN
TO-98 Tek Spec
Q202
*151-0192-00 Silicon
NPN
TO-92
Replaceable by MPS 6521
Q255
151-0220-00
Silicon
PNP
TO-18 2N4122
Q265
151-0220-00 Silicon PNP TO-18 2N4122
Q275
151-0221-00 Silicon PNP TO-18 2N4258
Q278
151-0221-00
Silicon
PNP TO-18 2N4258
Q280
*151-0190-01 Silicon NPN
TO-106
Tek Spec
Q300
*151-0281-00 Silicon NPN
TO-98
Tek Spec
Q302
*151-0192-00 Silicon NPN
TO-92
Replaceable by MPS 6521
Q355
151-0220-00 Silicon
PNP TO-18
2N4122
Q365
151-0220-00 Silicon
PNP TO-18
2N4122
Q420
151-0223-00 Silicon
NPN
TO-18
2N4275
Q425
151-0223-00 Silicon NPN TO-18 2N4275
Q435
151-0223-00 Silicon NPN TO-18 2N4275
Q440
151-0223-00 Silicon NPN TO-18 2N4275
Q454
151-0220-00
Silicon
PNP
TO-18
2N4122
Q470
151-0220-00
Silicon
PNP
TO-18 2N4122
Q505
151-0220-00
Silicon
PNP TO-18
2N4122
Q515
*151-0198-00 Silicon
NPN
TO-92
Replaceable by MPS 918
Q520
*151-0230-00
Silicon
NPN
TO-105 Selected from RCA 40235
Q525
*151-0127-00
Silicon
NPN
TO-18
Selected from 2N2369
Q545
151-0220-00
Silicon
PNP
TO-18
2N4122
Q550
*151-0230-00
Silicon NPN TO-105 Selected from RCA 40235
Q555
*151-0198-00
Silicon
NPN
TO-92
Replaceable by MPS 918
Q565
*151-0127-00
Silicon
NPN
TO-18 Selected from 2N2369
Resistors are fixed,
R200
composition, ±10%
316-0274-00
Resistors
unless otherwise indicated.
270 kn % w
R202
316-0682-00
6.8 kn
’A W
R204
316-0152-00
1.5 k n
'AW
R210
316-0103-00
io k n
'AW
R212
311-1232-00
50 kn , Var
7-7