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I recently re-cabled my Turntable with a 2 Meter NF cable. I attached the shield to the ground on the TT and also on the RCA plug going into the phono pre.
Now I have changed my TT around and I only need about 70 cm of cable so I am thinking of shortening the TT cable to lower the capacitance ( I think that is what it's called ) so my TT will work with more MM cartridges.
Question is: Should I attach the shield to the ground to the new PCA plug going into the phono pre or not?
Follow Ups:
I recommend connecting the shield to the plug and leave it floating at the TT end of things. Use the TT ground wire for the TT only, not the phono-level cable.
Thanks Duster. I always value your input.
Just a question: I thought the shield acts like an antenna. So If the shield 'receives' interference, wouldn't it 'drain' it into the phono pre?
A phono cartridge is a passive transducer; it's a passive device like a speaker is. As such, if the shield is connected to the TT end of things, there is no earth potential so it's useless to attempt to ground the shield at that end while leaving the shield floating at the phono preamp end of things. The phono jacks of the phono preamp provide the active aspect of the signal chain, they provide the energy for the phono cartridge to function, so the shield should be grounded to the phono preamp jacks, while the TT is grounded via its dedicated ground wire to the phono preamp chassis.
This design works.
nt
Thanks Duster for the explanation.
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