Atma-sphere M60 and P2 tubes

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

Hi all, just found this site. I'm new to tube amps in general and OTLs in particular.
I have a pair of M60 that I have been listening to for about a week. They came with
6H8C Russian and 6AS7GA General Electric tubes. I also have an older Atma-sphere P2 preamp with transformer outputs. Line and phono stages are all 12AT7s. Pretty sure the 3 in the line stage are supposed to be 12AU7s. The line stage 12AT7s are a combination of new EH and Sylvania tubes. The phono stage has a 3 GE, 2 Mullard ECC81 BVA GB, and 2 I don't know.
It sounds great, and I should probably just leave it alone. None of these tubes seem to be typically recommend, so I wonder what I might be missing. Without going crazy, where should I start to get the most improvement with different tubes?

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Atma-Sphere Music Systems, Inc.

Topic - Atma-sphere M60 and P2 tubes - Mike Ro 18:59:58 12/11/15 (6)

Just a FWIW - Ralph 12:29:20 12/14/15 (4)

RE: Just a FWIW - Mike Ro 16:30:39 12/14/15 (3)

RE: Just a FWIW - Cousin Billy 03:11:34 12/16/15 (0)

RE: Just a FWIW - Ralph 19:34:51 12/14/15 (1)

RE: Just a FWIW - Mike Ro 14:43:54 12/24/15 (0)

RE: Atma-sphere M60 and P2 tubes - Rod M 12:35:14 12/13/15 (0)

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