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- Wed Jul 31, 2019 3:17 pm
- Forum: Technical Discussion
- Topic: Ampeg Gemini I - hum hum hum !
- Replies: 10
- Views: 4416
Re: Ampeg Gemini I - hum hum hum !
I too have been working on an old Gemini I amp circa 1966 that had a persistent hum even after reworking the power supply. The grounding scheme of this amp is rather haphazard and it became evident that the offending components are the input jacks grounding to the chassis. I replaced the input jacks...