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Model 428B
REFERENCE
DESIGNATOR
PART NO.
T6
9100-1486
T7
9100-3228
V1, V2
1923-0017
V3, V4
V5
1923-0017
V6, V7
1932-0022
V8
5080-0041
V9
1921-0010
V10
1923-0021
W1
8120-1348
428A-21A
428A-83A
0403-0004
1440-0002
1490-0015
5040-0616
00428-66501
5020-0653
00428-26501
0330-0029
8520-0017
1410-0052
2110-0269
0510-0748
1205-0011
0370-0822
0370-0031
0370-0035
0370-0064
0370-0823
0370-0824
0370-0825
0370-0826
7121-0192
2950-0034
1200-0062
1200-0083
3100-0268
00428-90003
27
Table 6-1. Replaceable Parts (Cont'd)
-hp-
TQ
1
Transformer: head drive
1
Transformer: power
3
Tube: electron 6AH6
Not assigned
Tube: electron 6AH6
2
Tube: electron 6DJ8
1
Tube: electron selected 12AU7
1
Tube: electron 12B4A miniature 9 pin
1
Tube: electron 6AU6 miniature 7 pin
1
Cable: AC power
MISCELLANEOUS
428A-1C
1
Dust Cover (rack only)
1
Probe Assembly (see Figure 6-1 )
1
Escutcheon
428B-2A
1
Panel (cabinet only)
428B-2R
1
Panel (rack only)
428B-44
1
Assembly: cabinet
4
Bumper: rubber
Handle: leather
1
1
Bail: cabinet tilt
2
Detent: cabinet bail
1
Assembly: P .C. Board
1
Bezel
1
Board: P.C.
1
Boot (rack only)
1
Brush: nylon
1
Bushing: potentiometer
2
Fuse: clip
1
Fuse: holder
1
Heat sink
1
Knob: round, brown
1
Knob: 1" dia. black conc.
1
Knob: bar 1" dia. black
1
Knob: 3/4" dia. red w/arrow
1
Knob: red (for R63)
1
Knob: orange (for R69)
1
Knob: yellow (for R46)
1
Knob: green (for R98)
1
Nameplate (cabinet only)
1
Nut: hexagonal
4
Socket: 9 pin miniature tube
4
Socket: 7 pin miniature tube
1
Switch: rotary
1
Operating and Service Manual
DESCRIPTION
MFR.
MFR. PART NO.
-hp
-hp
33173
6AH6
33173
6AH6
73445
obd
-hp
33173
12B4A
33173
6AU6A
-hp
-hp
-hp
-hp
-hp
-hp
-hp-
OOOMM
obd
0000Z
obd
OOLAG
obd
-hp
-hp
-hp
-hp
76545
62
OOLAH
obd
32016
obd
91506
6008-32CN
75915
357002
98978
TXBF-032-025B
-hp
-hp
-hp
-hp
-hp
-hp
-hp
-hp
91345
obd
91961
obd
71785
121-51-11-060
91662
05-0730-02
76854
216481-HZ
-hp
obd
obd
obd
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Troubleshooting
