[ARC5] Unstable VFO

[Ian Wilson]

Posted a while back about a haunted ARC-5 VFO on 40m. Strange 'warbling'
instability that I just couldn't defeat despite changing many parts.

Someone - Ken Gordon, I think - suggested a bad joint around the tube
socket. The answer turned out to be a bad joint somewhere in the grid
circuit.

The VFO is quite stable now, running from a 182V stabilized (Zeners,
sorry) supply. The original dogbone ceramic capacitor has been replaced
with a polystyrene equivalent that appears to be doing a fine job.

This has taken way too much time, need to get the rig back on the air
now.

73, ian K3IMW