Thanks Don, K3FPR, for the troubleshooting info. I isolated the problem to the VCO part of the RF board. When I replaced T5 with the VCOSHLDKT a couple of years ago, I did not tin the T5 toroid wires very well. The K2 quit a few days ago. I removed the toroid, retinned the wires, resoldered the toroid to the RF board and the K2 came back to life. The PTTL phenomenon is for real. Roy Morris W4WFB
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