ah.1.51. HW-101-47: Driver Preselector Won't Peak for Full Output at 7.0 MHZ
May 15, 1979
HW-101 Bulletin No: SSB Transceiver HW-101-47
See Bulletin No: HW-100-23 Dated May 15, 1979
ah.1.52. HW-101-48: PEC [PN 84-22] No Longer Used
May 15, 1979
HW-101 Bulletin No: SSB Transceiver HW-101-48
The next production run of HW-101's will use discrete components instead of the PEC
at V15A since the manufacturer will no longer supply this part. However, the parts
replacement department has a three year supply of these on hand, so continue to order
the PECs if an older unit requires one.
ah.1.53. HW-101-49: Changeover to 6146B Finals
May 15, 1979
HW-101 Bulletin No: SSB Transceiver HW-101-49
The 6146A final amplifier tubes are no longer available from the manufacturer. Future
productions runs will use the 6146Bs. These are GE brand tubes and have been tested
in the HW-101. No difficulty was encountered in neutralizing the finals; nor did the RF
choke in the final plate circuit overheat. The tube replacement label [PN 390-146]
should be removed from all units brought in for service.
ah.1.54. HW-101-50: R940 Overheats
July 30, 1979
HW-101 Bulletin No: SSB Transceiver HW-101-50
In new units, R904 100 ohm [PN 6-101] is a film-type resistor. During installation, the
body of the resistor may rub against the driver shield, resulting in the resistor shorting to
the shield. When installing a new resistor or reworking the unit, position this resistor
away from the shield.
ah.1.55. HW-101-51: Operation of Mode Switch Trips VOX
July 30, 1979
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-51
Dress wht-org-org lead from foil side of modulator board away from V1 foils.
If dressing of this lead fails to correct the problem, install filter in line with wht-org-org
lead. Use the unused foil at point "A".
HW-101 Service Bulletins Page 148
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