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VOM and the Creeping Humm

forceof1

forceof1

Active Member
Bought a small Voice of Music console to convert. No known serial numbers or model numbers. Took the tube amp out. The phono automatically turns off the amp at the end of the record so i severed the connection and use the Tape input for my TT, works great.
Here's the big BUT when I turn it on after a few seconds a 60hz hum begins, and it gets louder then stays at a given volume. If I turn up the bass it will clip. If I turn up the treble it sounds like frying bacon. Volume knob has no affect. I've been through the whole ground loop test a couple of times - negative.
- Cleaned and lubed pots
-Cleaned all connections for corrosion etc.
I still have the 3 wires out the back that powered/controlled the on board TT. Since those are "open" could that create the hum? I kinda think its a power issue since it ramps up as the system heats up, or not. Looking at the amp I can't really ID what everything is. If you need an image , let me know and thanks' so much for taking the time to read thisIMG_0607.jpeg
 
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What speakers are you using with this? If they are extremely efficient (like headphones) you might just be hearing the background noise level of a mediocre amp. It is possible that the speaker sensitivity for the console may have been purposefully chosen to match the background noise level of the amp.

Still, Dave451's suggestion for a PS recap is an excellent place to start.
 
No, no recap. Initially I tried my NHT's but there was not enough power. Paired them with a pair of Polk bookshelf speakers, that seems to be a great match. Where do I have my recaps done?

Thank you both for your help!
 
I have several VM amps but this one doesn't look familiar. Take a closer look to see if there are any model numbers. Could be on the back of the console itself or somewhere on the chassis. Sometimes they used a paper tag with a number.

Did this operate correctly when it was installed in the console?
 
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