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I have an old late 70s Peavey PA-400 powered mixer. It's a workhorse that suddenly started doing the following: As soon as you turn it on - both speakers hum pretty loudly, and the back of the PA begins to get really really hot. If you plug in a mic while the speakers are humming, PA overheats and auto-shuts off. After cooling, you can turn it back on. If I turn on the PA (without the speakers plugged in) and leave it on for a good 15 minutes, then plug in the speakers - no humming at all - no significat heat either. All seems to work well if I let the PA "warm up" for about 20 minutes! Something is definitely wrong.

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  • moed33 Jul 14, 2008

    I'll have these things done and let you know. Thanks for the prompt reply!

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As these units get old, the solder joints can start to fail. Also, come of the components are getting tired. If you have no electronics experience, bring this to a servicer. I typically overhaul these units for about $100 plus parts. In most cases, the parts costis less than $20. These are solid units and you can probably get another 30 years out of it.

Part of the overhaul should be reseating all of the output transistors and replacing all of the heatsink compound as well as cleaning out all of the pots and switches.

Keep us posted.
Dan

Posted on Jul 14, 2008

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