[Heathkit] HW-101 questions.

[Kenneth G. Gordon]

Edward Richards wrote:

> Hi Ken;
> 
> That is not an unusual mod. I have done it to various receivers. The idea
> is to supply the VFO with constant filament voltage, even when the radio
> is turned OFF. This keeps the oscillator tube and compartment warmed up
> to reduce frequency drift when first turned ON. Maybe he had it in an
> unheated garage or something. He probably used an unused pin in the plug
> along with one of the two that go to the switch, to supply 120 VAC from
> the power supply. Some manufacturers, Hammarlund for one, have done this
> too.

I am beginning to think you guys are right. You are the third person to 
suggest this.

Although the VFO is an FET based unit, I suppose that by keeping the 
filaments on the buffer tube V-20 the 6AU6 in question, hot, that would 
reduce what little drift there is.

I think for my uses, I will take it out, since that way I don't have to run an 
additional wire in my PS to rig cable.

Ken W7EKB