An odd receiver problem

[David Stinson]

I'm betting on a parasitic oscillation in the RF or Mixer stages.
It would move slowly with heat, which means either a bypass
cap or an isolation resistor in a voltage divider mounted
somewhere near a tube socket.

When you next here the siganl, put your finger on each tube
starting at the RF and give it a little push.  The one that
makes the signal wabble is the villian.  Except the osc. stage,
of course.  It will wabble in any case if you push the osc.,
and even it could have a parasitic.

Or perhaps the ghost of the previous owner is saying "HI?"

73 DE Dave Stinson AB5S
arc5 at ix.netcom.com

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