Joe Bucher wrote:
I finally got around to restoring the old gal and it works pretty good
except for an annoying chirp on CW. It sounds like the VFO has trouble
starting and when it does the frequency shifts slightly down on keying.
Tubes are good and supply voltages look ok. Any ideas? Thanks much and 73!
Joe, KF9EU

Hi,

I had a chirpy Apache at one time, and had luck
substituting a 6AH6 for the 6AU6 in the VFO
(both tubes have the same pinouts).
This trick appeared in 73 Magazine in the early 60's.

73,
Ed Knobloch