[morzh]

What bothers me is that statement I mentioned, about touching the probe and all works after that.

Could you repeat that experiment?

When the radio craps out, touch that Sig Gen probe anywhere, and kep touching until (or maybe it is any place, the very first you touch) the radio plays normal.
Notice where you touched.
Also notice if this started with the actual probe touch or before that, when you connected GNDs together, or....

The more details the better.

Rod's suggestion is also valid. An IF can could crap out. Not the winding but a trimmer. But then, if the IF still works, how's that possible? Or maybe we think it works and it does not.


I thought of trying to run the signal from the sig gen WHEN the radio craps out, but if touching ANY probe to the radio makes it work again, that is gonna be futile. But if not, if you can possibly run the signal, starting through the Antenna terminal, from the Generator and see that it is weakened, you could possibly try to see exactly where it is attenuated.