What is the best premp for Atma-Sphere MA-1 3.3 amp?

I 've never heard the MA-1, but I have the the MP-3 and it sounds fantastic. I can't see going wrong with the MP-3. You can get the MP-3 with or without phono section and you are on the right side of "diminishing returns". The MP-3 is wonderful for tube rolling, you can really tailor the sound to anything you like (some may see that as a blessing or a curse).

Send Ralph at Atma-Sphere a message. His username is atmasphere.

Thanks elrod. What amp/speaker are you using with MP-3?

Vintage stuff - a Yamaha B-1 amplifier and Yamaha NS-2000 speakers

Atmasphere MP3 would be perfect match for an Atmasphere amp. I find the 6SN7 tubes in any pre to sound fantastic. I've been using an MP3 for a while without a hiccup.

Another vote for the MP-3.  I own and have been using an MP-1 with M60s for almost 20 years now. A close friend/audio bud has been using an MP-3 with MA-1s for about 10 years now. We have swapped preamps several times and I'm here to tell you that IME, the MP-3 gives me, minimally, 90% of the performance I get with the MP-1. It's probably even closer than that. In all that time, neither of us has had a failure beyond the odd tube giving up, whether it be amp or preamp. And Ralph and his staff are always available to assist you over the phone and will spend all day with you if the situation demands it. Honestly, I don't know how they ever get any product out the door considering how generous they are with their time. Truly a no brainer...go for it.