[GreenKeys] M33 - Buzzing

Aidan Riley w9pog73 at gmail.com
Fri Mar 6 13:53:58 EST 2026


Good afternoon all,

I'm trying to track down an issue that popped up with my Model 33. I had
the UCC-6 pulled out for a bit, but it had worked before. After
re-installing the unit, I found that there was a buzz coming from the
selector magnet with the switch powered off. It runs open in local mode. I
see no obvious issues with the SMD card, and the flat green resistor tests
well. I don't have much of a proper way to test the loop capacitor right
now.

Has anyone encountered an issue like this? Any suggestions for parts to
test?

Thank you all and 73,
Aidan W9POG
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