ohm resistor to a 47 kilohm resistor [PN 6-473]. This will raise the VFO output by
another 0.1 VRF. These power increases may make the difference between a unit that
will meet transmitter power specs and one that will not.
ah.1.85. HW-101-81: Preselector Capacitors Won’t Take Solder
JANUARY 27, 1984
HW-101 Bulletin No: SSB Transceiver HW-101-81
The variable capacitors [PN 26-122] have been found to have corrosion on the pins
used to solder the frame to the driver board. The last production run and all parts in
replacement stock had this condition. To correct, remove the capacitor from the circuit
board. With fine sandpaper or a small ignition file, remove the corrosion. Tin the pins
before reinstalling. Be careful not to damage the plates of the capacitors.
Replacement parts stock has been reworked.
ah.1.86. HW-101-82: S Meter Drifts; IF Oscillates
SEPTEMBER 21, 1984
HW-101 Bulletin No: SSB Transceiver HW-101-82
Check the brand of 6AU6 tubes at V3 and V4. If a brand other than GE is used at these
locations, replace them with GE brand tubes. Parts replacement will stock only GE
brand of 6AU6 tubes [PN 411-11].
ah.1.87. HW-101-83: Oscillation on 15 Meters
FEBRUARY 8, 1985
HW-101 Bulletin No: SSB Transceiver HW-101-83
On the RF driver board in the newer units, the tube sockets at V10 and V11 were
changed to types without the center ground post. Consequently, the switch shields
aren't grounded at those points. To correct, refer to the drawing below and use large
metal braid [PN 345-1] to ground the switch shield to the RF driver board ground foils at
V10 and V11 and at the ends of the shield where the bare wires are located. Resolder
the ground post connections at V6 and V7.
ah.1.88. HW-101-84: R1, R6 and R7 Out of Tolerance or Open
DECEMBER 22, 1988
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-84
The wattage rating of the resistors used R1, R2, and R7 are too low. This can cause
them to go out of tolerance and eventually open. To prevent this failure, change:
- R1 from a 100 kilohm, .5 watt resistor to a 100
kilohm, 1 watt resistor [PN 6-104-1].
HW-101 Service Bulletins Page 159
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