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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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Hi, I will do the best I can to help you. I remember these radios from my childhood. There may be some things you can do to help it tune to FM radio stations. On the back of the radio, there should be 2 screws referring to an "FM" antenna. If the radio is making a "hissing" sound through the speaker, but you are not picking up any stations, then connect a single wire about 1.5 meters in length to the screw labeled "FM antenna". The other screw, if it is labeled "ground" leave with no wire attached. Make sure that the wire you use does not touch both screws. The piece of wire should act as an FM antenna. If that is the only issue, then you should pick up radio stations.
That is a very well made, good quality radio, but it is over 50 years old.
Here is a link to Telefunken in Germany. They may be able to find a manual for you.
http://translate.google.com/translate?hl=en&sl=de&u=http://www.telefunken.com/de_DE/home/&ei=Vn46TYSVOcXegQfr3ZGDCQ&sa=X&oi=translate&ct=result&resnum=4&ved=0CDoQ7gEwAw&prev=/search%3Fq%3D%2522TELEFUNKEN%2522%26hl%3Den%26lr%3D%26safe%3Doff%26prmd%3Divns
I would suggest having someone fill out the request in English.
I hope I have helped you. Let me know.
Best Regards,
Mark







located the Telefunken website.
Here is a link to it.

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