AC cables for Atmasphere MA1s, MP1?

Ralph would be the best source, IMO. OTLs are finicky.

Sonic_genius, if you owned Atma-Sphere amplifiers you would know they are not finicky. In fact they are ultra reliable, unlike some other OTLs which are/were not -- an unfortunate stigma. If this were not true Atma-Sphere would have gone out of business long ago, but instead they've been around since 1976 and are still going strong. And they carry a three year warranty. A company that's uncertain of reliability doesn't offer that.

Back to the original topic, yes, some power cords sound better than others on them, but I can't post recommendations here.

I'm a dealer, so sprinkle liberally with salt if you wish, but please check out the products before making assertions.

I own 4 sets of Atma-Sphere power amps and don't think it matters what power cord you use as long as it's beefy.

Essential: This is NOT what I meant. The amps require a well matched cord. I have owned them including Fouriers. They were my favorite amps but I now prefer SEs.

The A-S amps will sound slightly different with different power cords, as will all electronics I've ever used. The generic cords A-S supplies with the amps sound okay. Other cords sound better. But the amps are NOT finicky and do NOT "require a well matched cord" as stated by Sonic_genius.

As Essentialaudio says, some cords offer better sound than others. And this is true with any piece of gear offering the neutrality and resolving capabilities similar to A-S.