[morzh]

Tony


Good insight. And the sockets have been brought up. And the sockets and heat could do exactly that.
One thing that has been done, I think - tthe tubes have been wiggled and poked; if the socket had one pin somewhere disconnecting, wiggling the tubes would likely do something to indicate bad connection.
It is almost like something get to a pretty stable state after 2-3 hrs. Like a flip-flop.

Forgot to ask: have we done the freeze spray yet? Has been suggested.
If not, we should, if yes, we should also try it on the tuning cap and the associated trimmers on it.