Olympic model B-925 speaker hum

[Billbobaggin]

Hey! I found an old Olympic radio and turntable cabinet at an estate sale and bought it for about 40$ it lights up and all the tubes seem to be in working order and not burnt out or without a vaccum, I went to plug it up and the speaker has a very audible hum that I can’t figure out the origin of. The turntable works fine it just makes a loud speaker hum that is super annoying. Any help would be appreciated.

 

[Bicyclist]

You're lucky nothing was destroyed during it on. You definitely are gonna need some serious service. Replacing all electrolytic caps and probably all the coupling caps. More folks will have better advice.

 

[Bicyclist]

Looks like it has 6k6 pp output so it might sound nice when refurbished. You're hearing a faulty power supply.

 

[Buck Rogers]

The large "Silver" can is your filter capacitor.

New stock caps are so much smaller they will all fit under the chassis.

The voltage and micro farad specs are on the side of the cap.

Leave it unplugged for a few hours, Then short each pin of the cap to the chassis to remove any charge.

Don't short good or new caps this way! It's not good for them.

Usually we simply Clip the lugs off the filter and add new caps to that connection

That should get rid of the hum.

Hope that helps~~! Good luck.

 

[Bicyclist]

Coupling caps and bypass caps may need addressing as well.

 

[gadget73]

Power supply and any wax caps are almost guaranteed to need replacing, but fair bet it'll mostly work fine once you do that. Likely could do with the controls cleaned as well.