" Uncle Peter" wrote:
Any articles or experience on taming drift in the Heath VF-1 VFO?

I got mine to be pretty stable. First I removed that big heat producing dropping
resistor (was it a 10K 5 W? it's been a few years) from under the chassis and
away from those heat sensitive frequency determining parts. Then I added a few
holes in the upper case to help remove more tube heat. Finally I got a small
filament transformer and ran the VFO filaments 24/7 which really helped with
warmup drift, which as I recall sometimes went on slowly for up to an hour. The
always-on didn't seem to hurt the tube life as I recall, but heck I had a bin
full of those 6AU6s anyway so it wasn't a problem...