The third try: Naim Superline with Rega RP10

OK, Just so I'm clear.  All this is the case when using standard length cabling, yes?  

So, even when using standard cabling with a capacitance plug then you are still getting bad noise?

Chris - this is a bit of a baffling one, especially as you've managed to substitute pieces into the system without seeming to solve the problem and involved your dealer. It sounds like a grounding issue but all what you have tried seem to reduce but not eliminate the noise.

I would look at simplifying the setup to try and identify the root cause and then if successful, build the system back up from there until you get the problem noise again.

I'd start by getting the system back to it's basic form with just the RP10, Superline, Hicap, 272, 300 in use. Remove the XPS at this stage.

Use standard naim power cables and a standard distribution block.

Leave the Unitiserve and its power supply off and have nothing apart from the TT connected to the 272 (no network connection, no AV amplifier etc).

Turn off Wireless on the 272.

Does this basic system setup eliminate the noise ?

“Guys - for my own education is there any reason why the 272 as a pre-amp should behave any differently to say a 202or SN when fed with a signal from a Superline?”

i had a problem with earth hum when attempting to use Supernait, HiCapDR as a preamp to a 250.2 with my lp12 / prefix/NDX. Took kit to dealer and found that the Snait was the problem box, earth hum BAD out of woofers. Has the hicap been taken out of the equation completely, and has the 272 been replaced with a 282 as a test? 

Scott

i gave up and purchased a second hand 282 from dealer. Problem solved. 

Scott,

Yes I believe the OP has tried a 252.  

Regards,

Lindsay

Has your RP10 worked successfully when played into a different system which has its own MC stage?

When I use my old Lehmann Black Cube SE instead if the Superline/ HiCap DR there is no noise. I did not try this with the new grounding cable of the RP 10. But with the standard RP 10 and a 5 m Audioquest cinch cable from the Lehmann to the 272 there is no noise.

Chris thanks. I can't comment on the Lehmann - possibly it can drive long i/cs better than Naim.  All I can say is to reiterate that long i/c s of 5m would push the Superline/PSU into instability and would likely result in poor sound and bad noise.  So any testing here must be with standard cabling before declaring any part defective.

Have you tried with standard cabling and some capacitance plugged on the Superline?

Richard: As I said we tested different cables and cable lengths at the dealer. The first mentioned noise was audible with all the cables. It is not the cable!

Did you try capacitance plugs with the Superline when you tested at the dealer?

According to Naim's R&D engineers, you will almost certainly get instability noise when trying to drive a 5m cable.  It's just not designed to drive such a long cable.  

And then what happened?

if it is not the cable, the superline has a problem.   I am curious to know how you will solve the problem.