Unit only works on low pass jack
SOURCE: Changing the output Jack on 1985 Peavey Dyna Bass
If this has active circuitry, one of the wires is the cutoff for the power supply from the battery. The other two are black for ground and either white or red for signal.
SOURCE: Peavey 115 Low hum Low volume from input
The preamp section has a problem. It could be anything in the preamp but is OFTEN the input jack itself. They take a lot of abuse.
Also the insert jack contacts that forward the preamp to the power amp if no external FX are used can go bad.
Additional things are circuit board cracks caused by rough handling and also controls that have had the knobs mashed in which can destroy the potentiometers they are connected to.
SOURCE: peavey minx 110 no output to speaker-headphone
LOUD SPEAKER BURNED REPLACE
FREDDY
TIGER ELECTRONICS LTD
ISRAEL
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