Isolating Digital Noise, need help.

Do you get any noise when only the amp is in the system and on, of course?

Is it possible to try a different outlet without the extension cord?

@tbg , no, amp is quiet.

@jond, I'll try that today, the cable from the Furman may reach across the room.
Thanks.

Lowrider, I had previously suggested trying the CDP’s stock power cord on the preamp. However, given that it is now evident that the CDP’s stock power cord doesn’t fully eliminate the problem when used on the CDP, what I would suggest is that you try connecting the CDP with the Audience power cord in series with the long extension cable (which eliminated the problem when plugged into a distant outlet), plugged into the **SAME** AC socket you normally use for the CDP.

And if that resolves the problem but also results in any adverse sonic effects, try putting the extension cord in series with the preamp’s power cord instead, plugging it into the same place as usual.

Keep in mind that when you eliminated the problem by connecting the CDP to the distant outlet you changed two things at once, namely using the distant outlet, and putting the extension cable and its undoubtedly significant inductance in series with the CDP’s power cord. At this point we don’t know which of those variables eliminated the problem, but it very conceivably could be either of them (or both).

Best regards,
-- Al

@jea48

Check again for resistance from the ground pin on the power cord plug to the metal chassis of the amp. "OL"?

Yes, OL (or zero L). Maybe a code for something?

Next measure from the ground pin on the plug to one of the outer grounds of one of the RCA jacks on the back of the amp. (No ICs connected to the inputs of the amp.) Any resistance?

  1.0 for resistance.

I have looked on Carver/Sunfire forums for a schematic and no luck. Others are asking for them and apparently the company has never released them to the public.
Many thanks for interest thus far.