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In Reply to: RE: Best IC's for vintage RCA jacks posted by sleeper on September 16, 2014 at 19:00:30
"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.
Follow Ups:
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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