ah.1.43. HW-101-39: Identification of The 6146a Tubes
NOVEMBER 20, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-39
The 6146A tubes [PN 411-75] used at V8 and V9 of this unit are marked '6146A' in
white ink on the side of the tube. These tubes may also have '6146B' etched in the
galss. These tubes have been reworked by G.E. and are acceptable for use in the HW-
101.
Most tube cartons will contain the following insert to explain the situation to the
customer:
IMPORTANT INFORMATION;
THE TUBE SUPPLIED WITH THIS NOTICE IS TYPE 6146A, AS PRINTED ON ONE
SIDE OF THE TUBE, EVEN THOUGH THERE MAY BE A 6146B ETCHED
ELSEWHERE ON THE TUBE ENVELOPE. ALWAYS REPLACE V8 AND V9 WITH
6146A TYPE TUBES
Replace the backing from this label and place the label at any convenient location inside
the cabinet top.
ah.1.44. HW-101-40: Noise or Static From Speaker When Chassis Tapped Lightly
NOVEMBER 28, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-40
If noise or static is heard from the speaker when the chassis is lightly tapped, check for
intermittent tubes, cold solder connections, or intermittently shorting filaments in the
pilot lamps by tapping each lamp lightly. This produces noise in the filament supply but
usually will not produce any difference in the lamp brilliance.
ah.1.45. HW-101-41: Relay Chatter in Any Setting of The VOX Sensitivity Control
DECEMBER 11, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-41
If the relays chatter in the VOX mode, try performing the procedures in BULLETIN'S
HW-101-13, -31 and -38. If these changes do not correct the problem, perform the
following:
1. With a scope, check for excessive noise at the junction [point 8] of R213 and R214.
Any noise on the white-red-red wires coming from the mode and function switches will
override the reverse bias to D201, thus activating V12B.
2. Replace the two white-red-red wires with shielded cable [PN343-15].
HW-101 Service Bulletins Page 146
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