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In Reply to: RE: Best IC's for vintage RCA jacks posted by manerac on September 16, 2014 at 10:41:07
A very common way of setting interconnect cables up is to ground the shield at the upstream end only. The 2 wires are used to carry signal. The shield "dumps" noise into the chassis of the upstream component, but does not carry info.
Eli D.
Follow Ups:
NT
Eli D.
So, both the shield and one of the conductors are grounded at the upstream end?
"So, both the shield and one of the conductors are grounded at the upstream end?"
Correct. An exception to the "rule" is in wiring a turntable up. Phono carts. are differential and have no ground. That's why you will find isolated I/P jacks, whose signal grounds are tied to chassis ground via 0.01 μF. caps. in phono preamps. The caps. are used to "dump" shield noise into the chassis.
Eli D.
Hi Eli,
Does that change the way you would wire a shielded twin-ax cable for phono?
Dave
Dave, it sure does. In the case of a turntable, the shield gets grounded at the preamp end. Best is a custom cable, where the shield has its own pigtail that's tied to the preamp's grounding post and is never associated with a signal carrying conductor. However, the caps. in a well constructed phono preamp allow the use of cabling with the shield connected to signal ground at 1 end. FWIW, I use a set of "Straight Wire" cables that way on my backup TT. The setup sounds pretty darned good.
Eli D.
Thanks Eli! It looks like a custom phono cable is in my future. Although my system sounds great now, I have been considering DIY cables for a while.
Dave
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