[Hammarlund] HQ-110C Help!!!

[Mike Lopez]

I have an HQ-110C with a weird problem that is driving me nuts!  When I switch to the SSB/CW mode, the radio goes in to continuous audio oscillation.....it screams. I have the AVC in the off position ( actually it doesn't make any difference, on, or off). I can stop the scream at -0- volume and bring it on at just below the 8 O'clock position ( I can barely open the volume control ). I can remove all of the tubes (except the 2 Audio tubes of course) and it still does it. I can the see the oscillation pretty much everywhere on the scope. It's not a humm, its like 1-2K cycles. The radio works in the AM mode and actually still works at minimum volume in SSB mode. I can hear a beat note at low volume when tuned to an AM signal so the BFO is working. I cleaned all the switches ...the problem doesn't seem to be there. Any clues????

Thanks,
Mike N8AZC
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