Stereo Amp Overheating

uberfusionJanuary 25, 2007

I have a 15+ yr old stereo (integrated AM/FM, phono, Amp - with external speakers) that has a pretty good sound and I use for my workshop.

The sound output is now low and a bit distorted (with a slight hum) and checking inside, the heat sinks for the o/p power transistors (both channels) are running very hot (can't touch) - even with the speaker wires disconnected.

I guess something is shorting... but no visible evidence of any problems - eg. the speaker wires aren't touching etc.

Don't want to spend a lot of money on fixing this unit and I'm quite handy with electronic repairs but I'm wondering where the obvious place is to start troubleshooting?

Many thanks for any ideas...

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The hum portion could be a filter capacitor leaking or going bad. With a VOM, you can check the Output transistors and see if they are reading properly.
Go HERE to help you check transistors if need be.

    Bookmark   January 31, 2007 at 3:38PM
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