I recently acquired a built K2, serial 7237. Occasionally, when first turned on, it emitted a very loud medium pitched tone for a couple of seconds. Otherwise it seemed to operate normally.
Now suddenly whenever it is turned on it emits this howl constantly, and no changes in settings affect this loud audio oscillation.
Before I embark on the laborious process of taking it apart to start measuring every voltage, I was wondering if anyone has a clue to what failure might cause this problem so I can focus my investigation more efficiently?
Thanks,
Stanley K6SGK
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