DELETE: (2) B21-31 (50) CAPACITOR, DISC .02 MFD Z5U
ADD : (2) B21-31 (49) " " "
" "DELETE: (4) 85-131-1 (1) PC BOARD, RF DRIVER MIXER
ADD : (4) 85-131-1 (1) " " " "
REMOVE: C-424 installed across R-401
NOTE: SBM-100-1 called for the installation of this capacitor on SB-100 units. This
capacitor should now be removed.
ah.3.5. SB-101-5D: Grounding Problems on Transceivers
June 3, 1968
SB-101 Bulletin No:SSB Transceiver SB-101-5D
A quality of factory wired transceivers have been shipped with loose rivets both at the
rear phono sockets & at the final tube sockets.
This is causing a serious grounding problem. Corrective recommendations are shown
on the attached sheet:
NOTE: IF MY INTERPRETATION IS NOT CLEAR - PSE LET ME KNOW
Illustration shows the installation of a ground buss for the rear panel phono sockets. It
also states that if the final tube socket rivets are loose, they should be drilled out &
replaced with 6-32 hardware.
ah.3.6. SB-101-1: Meter Zeroing
November 25,1970
SB-101 Bulletin No:SSB Transceiver SB-101-1
Original 10-147 control tolerance not sufficient to allow zeroing in all units. This part is
being respecified to a closer tolerance. In the meantime, any field problems regarding
zeroing of the meter can be corrected as follows:
Change: R-107 from 100K Ohm to 82K Ohm (1-159).
ah.3.7. SB-101-2: Repeated Heterodyne Oscillator Failure
September 14, 1972
SB-101 Bulletin No:SSB Transceiver SB-101-2
Change: R-212 from 220 Ohm to 330 Ohm 1/2 Watt resister (1-4).
SB-101 Service Bulletins Page 168
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