I own 3 amps.I have a Moscode 600.15 years old,never saw the inside of a repair facility.It must be on about 12 hrs before you listen; makes it hard to audiion.Worth maybe 300 on the used market/but not a bad buy. I own Music Ref.9 mk2,An Audio Research giant killer/unless you like your tube amp to sound 'sorta' solid state anyway. I had a vt100 in my house,back in 95/96 whenever they 1st came out.My dealer offered me 500 trade/I would have had to pay retail for his .After listening I was under impressed/and started to question Stereophile/the magazine.But,hey Moscode 600 (Twillo) and Lam1.1(Acuujim) quite a dollar discrepancy.What speakers are we (mouse/in/pocket)contemplating/own ? Surely this is THEE important factor.Sound Labs?/ Go for the Lamm. Mirage?/go for the Moscode.Music Ref for the in between speaker. It has user friendly trim pots and led's,for biasing and can use el34-6550-kt66/77/88. Make it sound like you want.MR1 ain't the same.FYI.