HP 120A - Page 92

INSTRUCTION MANUAL CHANGES
MODEL 120A
OSCILLOSCOPE
NOTE :: VJ and V102 may be 12AT7 instead of 12AZ7
Serial 151 and above:
C321 : change to
capacitor, fixed, electrolytic, 120uf, 350 vdcw;
-hp- Stock No. 18-62HP; Mfr., CC
C322, change to
C328: capacitor, fixed, electrolytic, 2 sections, 120 x 40uf,
450 vdcw; -hp- Stock No. 18-51HP; Mfr., CC
C322 is in the same can as C324
C328 is in the same can as C331
Serial 351 and above:
C225: change to
capacitor, variable, mica, 14-150uuf, 175 vdcw;
-hp- Stock No. 13-55; Mfr., QQ
C204: change to
capacitor, fixed, mica, 22uuf, +5%» 500 vdcw;
-hp- Stock No. 14-69; Mfr., V
ADD C237: 0237 is parallel with C225
capacitor, fixed, silver mica, 150uuf, +5%> 500 vdcw;
-hp- Stock No. 15-51; Mfr., A
R204: change to
resistor, fixed, composition, 3600 ohms, +5%> 1/2 W;
-hp- Stock No. 23-5-6K-5; Mfr., B
1 •
Paragraph 4-9C TRIGGER GENERATOR, change to read;
Connect a 250kc sine wave of 0.7rms
(third line from bottom) with less than 0. 7rms . ....
HEWLETT- PACKARD CO.
J