Thanks Jim for the battery suggestion. I have tried several means of supply voltage. Straight from a battery, battery with PWRgate, linear power supply that can vary votage from 13.3 to 14.9, switching power supply at 13.8 to 14.x.
The buzz varies from fairly slow at the lower voltage, increasing as voltage is increased until 13.9 where it "pulses" at about two or three per second. When voltage is increased, it speeds up and then stops completely at 14.1 volts. Receiving audio varies in volume, low to high and distorts as it is increased to maximum.
I suspect all of this problem is in the audio circuits somewhere. I'm not sure if there is an individual audio board in the radio or not that could be replaced. I suspect it will need test equipment to find the problem as it is probably unique to my K-3.
I am waiting for the support folks to respond with suggestions but I really think it will have to go on the bench at Elecraft.
73,
Griff....N5AG
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