I built a pair of M60s 20 years ago and they're still going strong. I did send them back to Ralph for an upgrade and to check them out a couple years ago. I highly recommend them--rock solid performance.
Atmasphere amps trustable?
Tube world, a big world, then I came acorss the Atmasphere on the net, looks different from those common tube stuff... kinda weird, the M-60 uses 8x 6AS7G output tube and 4x 6SN7 driver tube per channel, where're the rectifier tubes? Plus they're so-called OTL, sounds even more weird.