[Heathkit] HW-101 questions.

[Kenneth G. Gordon]

On 26 Apr 2005 at 15:34, George KB2Z wrote:

> Hello Ken,
> Not sure what you have in front of you having never owned a 101.
> The better receivers of the era used to keep the VFO fils lit up all
> the time for stability. Many of them would drift for a 1/2 hour or so
> when first turned on. Keeping the VFO hot cut down on the drift. I
> have heard it said that it also extended the tube life by eliminating
> inrush current every time you turn on the rig. Good luck with the rig,
> George kb2z

Hi, George.

Well, the 6AU6 is only the buffer amp for the VFO. The VFO 
itself is two FETs, an oscillator and a source follower, so I can't 
figure that keeping the buffer hot would help VFO stability 
much. 

The factory specs on the VFO are 100Hz to warmup, and 100Hz 
for a significant line voltage change.

Although, if this guy didn't know that, you may be right in 
what he was trying to do.

Thanks for the suggestions.

Ken W7EKB