high frequency intermittent noise

Before you get all spendy on fancy audiophile cables* is there some pro level shielding material that you can buy to wrap the cables? I know that the shields typically go to ground on one end, but I gotta believe there’s a cheaper  DIY way to see if better shielding works rather than buying fancy cable.
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*I’m not a ’cable denier’ - I use high quality "audiophile" cable in my system, but I’d like you to solve your problem rather than just throw money at it. And cables can get spendy fast- whether they are synergistic with the sound of your system is a separate matter.

@whart Are you thinking tin foil as well?

@james1969 - no, I was not. I was thinking of that braided stuff that is sold by electronic parts wholesalers or specialty suppliers, like the guy that sells the Duelund? cable that in certain cases needs shielding.

I reserve tin foil for hat lining, but make sure it covers the back of my neck. :)

Jea48 11-17-2017
...how about when james1969 used the pro-audio monitors for the test. When he hooked them up he heard the same RFI noise. Just a guess the amps are SS.

Yes, I had thought of that, and the fact that the same noise occurred with both amps does make it seem less likely that the possible absence of stopper resistors is a factor. But note that Ralph’s comment referred to the use of such resistors in solid state as well as tube designs. (Of course, in the case of a solid state design they wouldn’t be referred to as "grid stopper resistors," that being the term I used in connection with James’ tube-based Lamm amplifiers).

Best regards,
-- Al

Tin foil had no affect on the power cord.