[Heathkit] HR10B

[Bwana Bob]

If its drifting up and down, I would not suspect warmup problems. There
is no voltage regulation, so if your line voltage varies a lot you could
see some drift. You might try cleaning the end bearings on the variable
capacitors, not the ball bearings, but the brass fingers that make
contact with the shafts. Try  a good quality contact cleaner or DeOxit.
The same goes for the band switch. You could also have a faulty
oscillator tube or dirty tube socket.


				73,

				Bob WB2VUF

Wayne wrote:
> 
> I have a HeathKit HR10B and it receives very well but it drifts on CW the tone goes up and down is there a mod to make it more stable or do I have a weak competent in it somewhere, I have checked the tubes and replaced the weak ones.
> 
> Thanks Wayne AA5JJ
> 
> PS are there any modes for the HR10B like adding a OA2 to help stabilize it ?
> 
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