If V12 is an Elmenco tube, replace V12 [PN 411-124] with a GE tube. (NOTE: If a GE
tube is not available, it may be necessary to try several Elmenco tubes for a satisfactory
result.)
ah.1.20. HW-101-18: RF Choke in Final Plate Circuit Overheats or Difficult to
Neutralize on 10 Meter & 15 Meter Bands
JANUARY 20, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-18
6146B tubes in the final amplifier may be causing this problem. To correct, replace with
6146A tubes.
A label will be installed on the back panel of the HW-101 recommending the use of
6146A tubes only. The 6146B tubes should not be used as a replacement.
ah.1.21. HW-101-16: VFO Shift
FEBRUARY 2, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-19
The trimmers on the VFO tuning capacitor tend to align at their minimum capacitance.
Therefore, the head of the screw may not be under sufficient pressure against the
spring plates of the trimmers, and intermittent frequency shift can result. Changing C-
947 from 56 to 47pf NPO [PN 21-147] will allow the trimmers to tune to a point with
tighter compression.
ah.1.22. HW-101-20: Low Power Output, S-Meter Drift, Etc
FEBRUARY 3, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-20
The #44 pilot lamps presently used in the unit unbalance the series-parallel filament line
because of their 250ma current requirements.
In each unit service, change the pilot lamps to type #47 [PN 412-11].
This change will be incorporated in future runs.
ah.1.23. HW-101-21: Distorted Audio, No Carrier Null or Erratic Power Output in
Voice Mode
MARCH 31, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW0101-21
This problem may be caused by V1 oscillating at approximately 65KHZ, especially if a
"GE" brand tube is used at this location.
HW-101 Service Bulletins Page 141
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