Question about Peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2 OHMS => Model PV2000 Car Audio Amplifier

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Peavey Session 500 Mark IV guitar amp sound loss

I have a Peavey Session 500 Mark IV guitar amplifier that cuts in and out on the output. I have cleaned the contact points with contact cleaner, but I am not sure that is the problem.
I can play through it awhile and it will the just cut down on volume. I can move the gain knob and put a large amount of gain to it and it will pop really loud and then come back on, sometimes.
Could this be a power supply problem or do you deal with guitar amps at all?

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Proud owner of a session 500 here
had this problem from day one
brought in it for warrantee repairs many times
in the end, the shops could do nothing
they were lost
i tinker in electronics so i tore it down myself
after looking closely, i came to the reasoning that it was a cold solder joint
i took my soldering iron and redid every solder point on the boards
also cleaned the jacks while i was at it
reassembled it and fired it up
never had trouble since
i fixed it where the repair shop gave up trying
if you can solder, go for it and take it easy

Posted on Jan 06, 2010

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Hi Benjamin,

Electronics get things called dry joints, this is where the soldered components become insulated from their surrounding components intermittently. This usually manifests itself some years in use.

The symptoms are just like you describe the system cuts in and out.

I have repaired heaps of these over the years and it takes patience with a magnifying glass and a hot soldering iron to repair..

Id start with the socket connections on the main circuit board where you push cables in and them pulll them out again...as thats where mechanical pressure is
placed onto the conection between the socket and the circuit board.

Good hunting....YU BEUT..

Posted on Dec 04, 2008

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