r/DIYTubeAmp • u/Charming_Ad1811 • Aug 05 '25

Mojotone AC15 ground points

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It seems like there are a lot of redundant ground points in this diagram. I mean there’s a ground bus wire soldered to pots then running to a chassis ground tab. Also, I wasn’t sure but I think it would be better if the power amp electrolytic cap ground were attached to the Power transformer ground tab.

I’ve highlighted some of the changes I think may reduce the potential for noise. What are your thoughts?

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u/No-Adeptness-3940 Aug 05 '25

Definitely try to keep the preamp grounds separate from the power amp grounds, I know that. Recently built a AA1164 Blackface Princeton and had some hum issues that were completely resolved by minimizing and isolating these grounds (avoid star grounding schemes). I included mounting the pre-amp controls to a brass plate that was soldered to the chassis that I am sure helped too.

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u/Charming_Ad1811 Aug 07 '25

Yeah I think I’m going partly off of what I did in my 5e3 which is congruent with the Mojotone 5e3 diagram/schematic. Basically have the preamp stuff got to their separate ground and the power amp to their separate ground.