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Low hum from properly grounded turntable

post #1 of 4
Thread Starter 
Last night I hooked up my new AT LP-1240 to my Onkyo TX-SR601 receiver. I grounded the turntable to a case screw on the Onkyo, so there is no 60 cycle buzz (I disconnected the ground from the Onkyo with the turntable powered up, and, believe, me, I heard the buzz, which immediately went away when I reconnected the ground).

The thing is, there's a low level hum that's present, even when the power to the turntable is turned off. It's a tad louder when the power is on, but still present even when the power is off. I can also hear the hum waver a bit between album tracks... like it surges a bit then recedes. The turntable is isolated from any other audio components (the receiver is at the opposite end of the entertainment center)... so, I'm just wondering if anyone has any suggestions of what I might try to eliminate that hum. A power conditioner?

Thanks!

--Bill
Edited by billg66 - 9/18/13 at 8:11am
post #2 of 4
Quote:
Originally Posted by billg66 View Post

Last night I hooked up my new AT LP-1240 to my Onkyo TX-SR601 receiver. I grounded the turntable to a case screw on the Onkyo, so there is no 60 cycle buzz (I disconnected the ground from the Onkyo with the turntable powered up, and, believe, me, I heard the buzz, which immediately went away when I reconnected the ground).

The thing is, there's a low level hum that's present, even when the power to the turntable is turned off. It's a tad louder when the power is on, but still present even when the power is off. I can also hear the hum waver a bit between album tracks... like it surges a bit then recedes. The turntable is isolated from any other audio components (the receiver is at the opposite end of the entertainment center)... so, I'm just wondering if anyone has any suggestions of what I might try to eliminate that hum. A power conditioner?

Got a laptop that you can carry over and check how much hum its USB output has?
post #3 of 4
Thread Starter 
Quote:
Originally Posted by arnyk View Post

Got a laptop that you can carry over and check how much hum its USB output has?

Yes, I do... I'll give that a try as soon as I can. What might the presence/absence of hum prove?
post #4 of 4
Quote:
Originally Posted by billg66 View Post

Quote:
Originally Posted by arnyk View Post

Got a laptop that you can carry over and check how much hum its USB output has?

Yes, I do... I'll give that a try as soon as I can. What might the presence/absence of hum prove?

If the hum is less with the USB connection then it might suggest that there's something going wrong with your connection to the preamp.
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