Question abouit signal grounds and connections from a TV ?

I just installed a new Mains cable arrangement in my system, I believe the overall noise floor of the system has dropped considerably.

My question:

I have a 4m attenuated interconnect between the TV and the Preamp. The TV has 2 wire mains input, i.e. no earth (I imagine it's double insulated ?).

I haven't tried disconnecting yet, but I was wondering if the 4 metre interconnect would be polluting the ground plane of the preamp, even when the TV is off ?

If it was I was wondering if some kind of transformer connection would be better ?, or even a A/D converter, they can be had cheaply, and going through an optical of my DAC.

Any thoughts on the subject ?

Is this going to an amp or preamp? You could fit an earth lift resistor to the signal ground inside the amp/pre. How you do this depends on how the signal ground is connected inside, i.e. are the rca sockets insulated from the chassis?

Quote:

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Originally Posted by Ali Tait

Is this going to an amp or preamp? You could fit an earth lift resistor to the signal ground inside the amp/pre. How you do this depends on how the signal ground is connected inside, i.e. are the rca sockets insulated from the chassis?

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Come to think of it I think the preamp has a ground lift switch, The preamp is an implementation of the tentlabs volume control, i've asked the same question of the builder.

Ok sounds like it's sorted then. If not, you'd just need to fit a resistor from the rca socket grounds where the i/c from the telly connects to. 100 ohm will do.