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...

Thank you for reporting this comment. Undo
gilloz

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
Sign Up to comment
More Discussions
13.2v Battery Charger
The battery charger for my Craftsman drill has died...
randy427
vizio xvt473sv dead
I have a 4 year old VIZIO XVT473SV that now has NO...
thew60
Lost sound on my computer.
Once again I need your help. I have been persuaded...
ronalawn82
Headphone jack
Dug up a sub-mini plug for my home phone earphone jack....
stoveguyy
plug-in tart warmers - parchment-paper safe?
Hi, re: plug-in wax-tart warmers: Is it safe to cover...
jally
© 2015 Houzz Inc. Houzz® The new way to design your home™