I have an older K3 ( under 3000) so I do not have the newer KPA3A. Several yeas ago I had to replace at least one of the driver transistors. At that time I also changed some transformers either on the driver or final board. I do not remember without looking but the nature of the wire change was either to or from enameled. I also recently installed gold pins because the pins leading from the main board to the interface board to the KPA3 had tarnished. Those are the only changes that I have made to the TX side since it had been sent back to the factory by the prior owner. Barney K3LA
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