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Old 22nd November 2011, 07:13 PM   #11
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Very interesting.

Basically the course is:

Ground board-----post (isolated)---- chasis

żNot?

Regards
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Old 22nd November 2011, 07:17 PM   #12
6L6 is offline 6L6  United States
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Yes, that is what worked for me. Wayne suggested to start with the chassis not connected, as it can be quieter that way. I tried it, but connecting the chassis was quieter. Try it both ways, one will be better.
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Old 22nd November 2011, 07:30 PM   #13
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My setup is much more complicated but I have to keep trying.

Out put ground--- post (isolated)--- Ground Loop Breaker---- IEC earth
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Old 22nd November 2011, 07:51 PM   #14
6L6 is offline 6L6  United States
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I do not have the PSU IEC earth connected to the RIAA box. The safety earth is only in the chassis that holds the PSU. The umbilical has only DC + and - , those connect to the RIAA circuit board, and never touch the chassis.

What noise I have in the circuit is the same regardless if the PSU is powered on or not, and even if it's connected or not! There are no bleeders in the power supply, the circuit will run for about 40 seconds once the power is off. About 30 seconds if you unplug the umbilical completely. There is a lot of supply capacitance.

I need to try a groundbreaker on the RIAA chassis connection. That will be my next step.
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Old 22nd November 2011, 08:14 PM   #15
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I will test your configuration of Ground
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Old 8th March 2012, 02:20 PM   #16
rizqi is offline rizqi  Indonesia
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@6L6
can you share scheme v2?..
regards...
__________________
Better try it ...
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Old 8th March 2012, 08:01 PM   #17
6L6 is offline 6L6  United States
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Quote:
Originally Posted by rizqi View Post
can you share scheme v2?
I'm not sure what you mean...

I will be happy to help, can you be more specific? Thanks!
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Old 11th April 2012, 07:03 PM   #18
Dzius is offline Dzius  Poland
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Here is my version on PCB's which have been done by myself.
Pearl_foto1.jpg
Pearl_foto2.jpg
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Old 11th April 2012, 07:41 PM   #19
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Beautiful!
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Old 11th April 2012, 08:30 PM   #20
6L6 is offline 6L6  United States
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Pearl 2 boards! Very nice! I like the look of the mirror-image.

Don't forget to use the PCB starground - the hole above C12 and below C4.
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