Atma-Sphere MA-1 amps

For some reason, the MP-3 doesn't seem to get the respect of the M60s, and I wonder if this is due to the phono stage. As a line stage it seems to let the M60s do the transparency, microdynamic detail, incredible timbral accuracy and expansive soundstaging thing that the amps are capable of. I've tried a Joule LA150MKII and Dodd Battery pre with the M60s and they sound quite different (and more similar to each other) than the MP-3 with the M60s (both warmer and plumper in comparison). To my ears, the Atma-spere pre is an important part of getting the Atma-sphere "sound" - for better or worse; I like what the whole package can do, and to my ears there is no better amp that I've heard with my Merlins than the Atma-spheres; that first amp after many tries, where I found an amp that let me sell my CAT JL2 with no regrets - at all; I prefer the Atmas with the Merlins - though I suspect the CAT can do its "thing" with a very wide array of speakers.

Just a comment on NOS tubes. I have been rolling a few and I jst want let it be known that all tubes I have received from Andy Bowman at Vintage Tube Services are clearly matched and quiet, very quiet. With other sources I have not been so lucky. I'm sure you can get well matched from other sources, but Andy has never failed me.

 
So... what are you trying and whattya like?
 

My favourite combination in the MP3 (2 12au7, 2 6sn7s, and a 12at7 not in audio circuit)is the 1940/50s RCA 12au7 Blackgate combined with the Sylvania 6sn7GTA (not sure GTB would make any difference). I tried the RCA Cleartop and Siemens 5814 which seem some what similar to me, compared to the Blackgate 12au7. I use the pre with the M60 amps and I think the 12au7 lends a touch of warmth which is a nice touch with the neutrality and transparency of the amps and my Merlins. The RCA 5814 seems very similar to the Blackgates. My combination definitely performs very well for my music and ears, but I don't doubt there may be even better combinations out there, but I'll stick with this for a while. P.S. I use RCA combined with Sylvania GTBs in the amp - 2 RCA in front 2 Sylv. in rear slots; I prefered this to all Sylvania. This being said, the Atma-spheres sounded great with any of this combinations, it is just a bit of spicing to a basic recipe.

What 6SN7's and what location are people using in their MA-1's?

My understanding is that v1A, v1B, V2, and V3 are the most important sockets in terms of altering the sound of the amp and that v4 must be a GTA or GTB tube.

Thanks,

George