Gary,
That's interesting that you mention using your own voice rather than
injecting a tone for suppression adjustments. A long time ago I thought
about making a continous loop tape using my own voice with a long
"hello" for that very purpose.

This particular 20-A is factory wired and no adjustments have ever
been tweaked with exception the two audio balance pots and the driver
circuits on the upper bands. All the 9mc.RF slugs still have the little
blob of grey paint on the threads. All I've ever done to it was to
replace the cathode resistor in the VOX relay tube. It's value had
crept up and I really had to holler at the mic to get the relay to pull
in.

I use it more often than not barefoot just for fun. It's been a good
rig for the 42 years I've owned it.

John