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My Telefunken Opus 7 radio suddenly started humming real loud. I went to sleep with it playing nicely, and it woke me up in the middle of the night with the humming. It's about fifty years old, but it has been an exceptional radio. I would like to keep it if it's fixable.

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  • Anonymous Nov 05, 2008

    I also have a Telefunken Opus 7 with a loud hum when turned on. I agree with replacing the filter caps (which I will do) Also I onder if the full bridge diode is bad, however, the small in line fuse (top right of chasis) has not blown. I'm going to replace the filter caps and then go from there if still not working.

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3 Answers

Could be a bad selenium rectifier as well

Posted on Oct 08, 2008

Replace the two 50uf 250 electrolytic filter caps (they are in one can above the chassis) Don't play it in the meantime unless you have good fire insurance.

Posted on Oct 01, 2008

Replace the filter capacitors in the power supply section

Posted on Sep 24, 2008

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