Heathkit HW-16 drift

[Tom Buchanan]

My Heathkit HW-16 receives great some of the time and output is good at 50w to 65w all the time.  I have been enjoying making contacts with it.  I have retubed it except for the final output tube.  The filter capacitors test okay.  I am using a Heathkit HG-10 VFO with it.  Replaced a bad VR tube in the VFO yesterday.

It randomly will drift off frequency a bit with the audio gradually increasing to a high pitch then a bunch of garbled distortion before silence, then audio is back to normal for awhile.   Anyone had this experience before or know of a cure?

Tom
KG4KGY 

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