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Post by stuey222 on Mar 25, 2009 19:24:17 GMT -7
Do you just have the amp plugged into the wall? Sometimes you can get some hum from computers, fridges, etc.
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Post by gtrplr2 on Mar 25, 2009 19:32:39 GMT -7
Thanks stuey!
I have it plugged into a power strip, then to the wall. I have turned off or unplugged everything I can think of, and I have the amp downstairs where there is nothing but music gear hooked up. I have several other amps in the basement, and they have no hum when on at idle.
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Post by stuey222 on Mar 25, 2009 20:50:24 GMT -7
Ok, my next thoughts would be to swap out all of the tubes. If you still get the hum, I would call the shop and talk to them, they're very helpful, and it sounds like you bought it new, so you're still under warranty.
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Post by gtrplr2 on Mar 26, 2009 3:11:41 GMT -7
I will try swapping the tubes first. Yes I bought it new, and I received the amp yesterday. Thanks again.
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Post by gtrplr2 on Mar 26, 2009 4:55:20 GMT -7
OK, here is where I am. I have some good tube testers, Maxi-Matcher and Hickok 800. So I tested all the tubes and they all test good. So for process of elimination I reinstalled the rectifier and the EL84's. Turned it on, no hum. Then I started with the preamp tube nearest the El84's (V3), which I believe to be the phase inverter, and there is the hum. I tried swapping out the V3 tube even though it tested good. I tried a 12AX7, 7025, etc. the hum is there with any tube in V3. So that is where I stopped, and will be calling the shop later this morning.
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