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Reattaching the wire might have corrected the problem. I don't remember the first post being that long nor the radios swapped out and the problem was still there with the new radio. Might have been a low voltage problem because of the contact resistance. But with the radio swap it would indicate a problem with the amp,


Some times the keying circuits will oscillate and with no carrier input. I had a KL-1000 that did the exact thing. I tuned a capacitor in the HV area and that stopped it.


It could be a bad jumper in your set up.