I think you are already at the forefront of what you should expect from a great tube amp at that power rating - changing to EL34s will give you another sonic signature though.
Send it in to Roger and get the amp upgraded to MkII status. You already have a well designed amplifier to begin with and to better it you'd have to spend as much as an RM-200 MkII, maybe more if looking at other manufacturers as well. Upgrading to MkII status will give you the most bang for the buck. When I owned my RM-9 MkI it's exactly what I did so I speak from some experience.
I just stumbled on to this thread. Brings back great memories: After many years of SS I bought my first tube amp in years, it was 1996, I think, and I bought the remarkable RM10 MK II from John Rutan at Audio Connection in Verona NJ to pair with my Sound Dynamics 300 TI. I've always regretted selling them. And a shout out to John, he definitely knows his stuff, and is one of the truly nice guys in audio.
Not sure what Roger did from I to II, but I do know that he does makes this changes unless they are real and substantial, so as Clio9 says, that might very well be a worthy improvement - the RM9 is a classic, might as well go to MKII.
Thx for the input guys. A phenomenal amp. I have sent an email to Roger inquiring about the upgrade. Clio09 - can I ask a few questions? How did the sonics change with the upgrade ? Do u remember what got better what worse - or was it all good ? What speaker/s are you basing the impressions on ? Much appreciated.
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