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Peavey BackStage Plus guitar amp very low volume

30 year old Peavey BackStage Plus guitar amplifier suddenly has very low volume.
There are no obvious physical problems. Tried several instruments and guitar cables.
 

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bluemoon
bluemoon picture

Hi,
 this is not enough info you give us. Without some measured values nobody can help you. The 2nd problem is a measuring in Peavey guitar end other amplifiers because they use very weird conception. The power amp and the preamp gnd-s are on different potential and the output stage transistors emitters common point is not connected to speaker, it is connected to gnd! As first without schematics and oscilloscope is nearly impossible to find error. My opinion is, it will end with your decision to find some service where they know how to handle this kind of amp.

wish you a very nice day

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Jaca
Jaca picture
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Hi!

First check phone out, and preot. It has normal level?
https://elektrotanya.com/peavey_backstage_plus_sch.pdf/download.html

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