One or more bleeders is open or a cold joint on the rectifier board.
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On Sunday, January 20, 2019, Steve London <n2icarrl@gmail.com> wrote:
I have an SB-220, of unknown lineage.
While using it, I noticed that on receive, listening on my receiver, I was
hearing a strong tick, tick, tick sound, about 3 ticks per second. With a
little
experimentation, I noticed the tick rate was higher in the SSB position than
the
CW position. At audio frequencies, I localized the source to the HV area of the
amp. My guess would be filter capacitors, rectifiers or equalizing resistors. A
few more data points - the equalizing resistors are not the original - they are
100K, rather than the original 30K. The electrolytics are Nichicon 200uF, 450
WV, 85 degree C. That's probably not original, either. I don't see any cracked
resistors. Best course of action ? Replace the electrolytics ?
73,
Steve, N2IC
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