Best preamp for atma sphere m60 under $3000 used?

Pedrillo, it's not just tubes, I have had many top flight tube amps, it is the magic of Atma-sphere, OTLs, Class A, and triode. I've come to the conclusion that IF your speakers are OTL friendly, they are very tough to beat - of course OTLs won't shine with every speaker. Congratulations on your M60s, the MP3 will suprise you as well.

I haven't actually heard this combination, but, there seems to be some design similarities between the Atmasphere pre's and the Sonic Frontiers Line 3 SE (which can often be found here within your budget).

Another option with sonic similarity is the CAT preamp. There are a few used ones for sales on A'gon $¬2k

Pedrillo,

IME, your current phono stage is much quieter than the MP3, I know as I've owned them both. Although the MP3 has many attributes, take that into consideration. If you plan on using it mostly as a linestage, fine. IMO, it is worth comparing it to the Dodd.
Also remember that you'll want to use balanced cables from M60 to MP3. Cheers,
Spencer

Hi Spencer. I do wonder if your "issues" with the MP-3 were based on the phono stage which seems to have some noise issues and seems to require very quiet tubes to work best. As a line stage I think it works very well indeed and it sound quite different with M60 than the Dodd (I own both)and preference here is a matter of taste, I prefer the MP3 with the M60, but love the Dodd with my Music Reference. It might very well be a good option to use the Dodd with a separate phone stage. You have a lot of experience with the MP-3's phono stage so it seems like fair warning.