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ah.2.9. SB-100-9: Tuning Erratic
February 22, 1978
SB-100 Bulletin No: SSB Transceiver SB-100-09
Some of the earlier LMOS can be opened up for service, such as cleaning the wiper
contacts on the tuning cap when tuning becomes erratic. Some of these units have
fiber washers between the frame of the tuning capacitor and the worm gear assembly.
Intermittent contact between the teeth of the gears can change the ground path for the
tuning cap and also cause erratic tuning. Simply replacing a fiber washer with a metal
washer will give good connection between the tuning cap frame and the worm gear
assembly to eliminate this problem.
ah.2.10. SB-100-10: Relays Remain Energized After Transmit Condition
June 5, 1978
SB-100 Bulletin No: SSB Transceiver SB-100-10
After keying the transceiver with PTT for thirty to forty seconds, a positive voltage in
excess of 10 volts appears at the control grid, pin 9 of V12, thus keeping the relays
energized.
To correct the problem, replace V12 [PN 411-124]. IEC brand tubes have been found
defective in several cases, b ….(rest is missing)
SB-100 Service Bulletins Page 166
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