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Conrad Johnson PV-14 background noise

Hi.

I noticed a faint background hum caused by my CJ PV-14 (because there is no noise when I turn on the power amp only), it is not obvious but you can hear it when you get really close to the speakers. I have tried a set of new tubes but the noise did not change. Anybody has experience to share?

Thank you!
jeq
dwr
113 posts
 
I just purchased a PV14L from an A-gon member and this unit has no hum at all. The unit came with a total of 4 tubes and 2 of those had tube hiss but after sorting through the tubes I came up with 2 that are nice and quiet. You may want to try a cheater plug and see if that removes the hum.
rrog
1,958 posts
 
Jeq, Did you buy your tubes from CJ?
vernneal's avatar
vernneal
438 posts
 
try plugging electrical cables into different sockets you may be getting a ground loop hum especially if you are using a sub
jeq OP
17 posts
 
Thank you for your advises,

Dusty, I have to be very close to the speakers, so I guess it is not unacceptable

Vernneal, I will try other sockets.

Rrog, No, I did not get it from CJ. I got it from Ebay. But the old ones I use are Mullard purchased from CJ and they have noise too. And I tried to call client service of CJ but its always answered by an answer machine.

Dwr,could you please elaborate a little bit what is a cheater plug?
rrog
1,958 posts
 
Is it a hum or hiss?
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