Can anyone direct me to a source of information or a tutorial on Ultrasonic
feedback in modulator circuits such as that in the Heathkit Apache.
My Apache modulator squeals when the microphone gain is raised and the
modulator tubes draw a lot of current. As long as the microphone gain is kept
very LOW the current does not take off and there is no squeal coming from the
modulator section. I am going to go through the section with a screwdriver and
a nut driver to tighten up the grounds to the chassis and tube socket.
Ultrasonic feedback is a NEW phenomenon to me. Someone mentioned ferrite beads
some time back. Thanks for reading. 73, John, K5PGW
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