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Anyone Know Where I should Look to Figure Out This Hum?

http://https//www.dropbox.com/s/faxmop972rok7i1/Noise.m4a?dl=0

I recently purchased a Lamm LP2. First couple days, silent. Now this. It's coming from both sides equally, turning up the volume makes it louder. It's not the cartridge. Noise still there when I unplug the turntable inputs from the phono preamp. It sure doesn't sound like a ground hum and since it's both channels I don't think it's going to be a bad tube . I have another set of tubes on the way but they won't be here until next week so I can't double check that. I swapped out the rectifier tube and that changed nothing. 

Help!
dhcod

Showing 1 response by uberwaltz

uberwaltz's avatar
uberwaltz
13,381 posts
 
But why the ground loop hum not happened in first couple days?
My initial thoughts were how would this be solved by a cheater plug but....

It is likely a very good indication that something has failed or is on the verge of failing internally in the Lamm and was just very unfortunate timing on the ops part.
Did you buy it used?
If it was myself and it had started acting up after just two days I would be talking to the seller......
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