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stevie23 · 20th Jul 2021, 7:29 pm

OK, thanks guys. I've swapped out the reservoir caps. The humming has now stopped but it now goes into oscillation/motorboating when the gain is up past the halfway point and playing stops.

20th Jul 2021, 7:29 pm	#10
stevie23 Pentode Join Date: Apr 2021 Location: London, UK. Posts: 103	Re: Ferrogaph 2A amplifier hum. OK, thanks guys. I've swapped out the reservoir caps. The humming has now stopped but it now goes into oscillation/motorboating when the gain is up past the halfway point and playing stops.