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Suddenly getting hum. Not sure why.

I turned on my system and flipped my Pass X1 input over to phono to listen to some vinyl. I was surprised to discover hum coming from my speakers. My TT setup is: Benz SL -> Linn Akito 2B -> AR ES-1 -> Cardas Clear -> Plinius Jarrah -> Cardas Clear -> Pass X1. The table is plugged into a VPI PLC. The only time before this I ever had hum was when an errant light dimmer control in my home (there are several of these) was accidentally left on. When they are all off there has never been any other hum issue. The Cardas DIN cable is grounded to the Plinius. Hum varies with volume.

I tried ungrounding the DIN cable. The hum went away, but as soon as I flipped on the VPI PLC that caused a different hum that I would get from the VPI PLC, which caused me to ground the DIN cable in the first place. With the DIN cable grounded this hum goes away. Let me repeat I have never had a hum issue with this configuration.

I tried one thing, disconnecting the phono cable in its entirety - signal plugs and ground - from the phono stage. That worked; with the inputs to the phono stage floating open there was no hum. What could have possibly happened to make hum appear when it was not there just last week? Could some sort of damage to the cart cause this? The hum is coming from both channels. Normal line level inputs (when selected) to not exhibit any hum.


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Topic - Suddenly getting hum. Not sure why. - tonyptony 15:19:43 07/28/14 (13)

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