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Horsebox 26th April 2011 05:53 PM

Basic SSE input RCA jack wiring question
Hello again,

Before I go and solder the inputs, I have a niggling question about the RCA wiring, and would be grateful for any help!

I have a metal top plate that is earthed. The RCAs have two terminals, obviously electrically separate. One of the terminals of both RCAs is basically a solder tag that, when fixed in place, will be in direct contact with the top plate and hence will be earthed. Will this work, or do I need to insulate the RCAs from the top plate to prevent them having the same signal ground (i.e. earth in this case)?

Hope that makes sense! And thanks for any help.

rknize 26th April 2011 10:20 PM

If you look at George's wiring diagrams, using the RCA signal ground as the earth ground for the PCB is one of the options. In short, yes this can be your ground point. Make sure the rest of the grounds are right there too.

Horsebox 27th April 2011 05:26 PM

Thanks Russ. I am referring to George's wiring diagrams constantly as I know no better. I think the fact that there was a separate earth wire from one of the input jacks to the star earth puzzled me a bit as surely there's no need for this wire when the whole top plate is earthed anyway.

What I've got now is both RCAs grounded to the chassis, which itself is earthed to the third pin in the wall plug.

It's getting very close to checkout time, and then throwing the switch if all is well. My neighbours can smell the fear.

I measured 802 V unloaded across the two red wires on the PT yesterday (Hammond 374BX). That seems really high, but maybe the 0 V tap (red/yellow) sorts things out.

rknize 28th April 2011 03:28 AM

That's about right (401VCT unloaded). It's rated at 375VCT.

redjr 24th April 2012 12:20 AM

Do you have a link to 'George's wiring diagrams'. :) I've got a ground loop hum and want to make sure I've got my RCAs wired correctly. In my case the connectors are isolated with the ground lugs wired to the star point. What type of wire should I be using? Shielded, single core?

boywonder 24th April 2012 01:45 PM


Originally Posted by redjr (
Do you have a link to 'George's wiring diagrams'. :)

Looks like George has fixed many of the broken links....

Wiring Diagrams

redjr 24th April 2012 02:55 PM


Originally Posted by boywonder (
Looks like George has fixed many of the broken links....

Wiring Diagrams

Thanks boywonder.

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