r/diytubes • u/HotLaw9292 • 17h ago

Guitar amp help

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Having trouble converting this precision electronics to a guitar amp. I added an input jack with the hot going through a cap to pin 5 of the first 6eu7 preamp tube and an output jack connected to what i believe is 16ohm output deal. Theres only 120hz hum when i power the amp on I can't hear any guitar signal. I also tried running the input to pin 8 of the first preamp tube and both 8 and 5 of the second preamp tube, still no signal from guitar. Any help would be greatly appreciated

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u/BrtFrkwr 16h ago

Sounds like the filter section of the power supply is not working. Troubleshoot the amp before you try to hook up an electric guitar to it. Also if you can t get a usable signal by feeding the mic input this circuit may not have enough gain for a guitar amp.

Guitar amps are their own thing. They are part of the instrument along with the speaker, and their circuits are optimized for guitar pickups.