I think that since the Berning amps generally retain about 80% of retail value on the used market, it is worth it to just buy new. I agree that tube rolling is beneficial with these amps, just as it would be with just about any tube amp. Mfrs cannot use NOS tubes because of flucuating prices and availability.
Music Reference RM200 or David Berning ZH270?
I am interested in both of these amps. Has anyone out there heard both of them before? The associated equipment that I would be using is Gallo Nuclius Reference speakers (88db efficiency), Supratek Syrah preamp, Granite Audio 650 CD player, MIT 330 and TG Audio IC's and MIT 750 plus speaker cable. Can anyone tell me the differences in these two amps, or your expriences with them?