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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 2 responses by imhififan

imhififan's avatar
imhififan
2,221 posts
 
First couple days, silent. Now this. It's coming from both sides equally, turning up the volume makes it louder.
My suggestion is unplug everything from the unit, check inside the unit for any loose connection and make sure all tubes are firmly insert to their sockets then reconnect the unit to your system. From the picture I can see some (2?) cable with screw-in connectors inside the Lamm LP2.

https://www.lammindustries.com/PICS/LP2/modified/LP2%20inside.jpg


imhififan's avatar
imhififan
2,221 posts
 
I recently purchased a Lamm LP2. First couple days, silent.
But why the ground loop hum not happened in first couple days?
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