Is the moscode 300 the Best $600 used amp?

Frogman, Actually I do know the sound of these amps since I have owned them all. Regarding the the Moscode 300 sounding better than the 600, it is common within a design for the lowered powered amp to sound better, "less is more".

Ah how things change.
I bought what had to be one of the first NYAL Moscode 300 amps many years ago.

At the time I was almost laughed at for owning such a contraption. I drove Apogee Duetta Signatures with it, which again was asking for trouble from the crowd.

All told I was quite happy with the setup, I kept it for years, long after NYAL went away. I'd sent it out to George Kaye (AKA Moscode) for updating.

I enjoyed the Moscode 300 for many years.

My only comment was that I never felt it was not particularly "tube" sounding. 'definitely part of the way there.

Ultimately I moved on to straight tube preamp, transistor power amp.

Rrog, why don't you share your thoughts on the sound of these amps, so that a meaningful contribution to this thread be made.

Frogman, I don't know what your problem is. The OP did not ask for a comparison of a B&K ST140 and a Moscode 600 nor did the OP ask for a description of the sound of those amplifiers. The OP wants to know if the Moscode 300 is one of the best $600 amplifiers and I commented early in this thread in my opinion it is.

just my 2c to add my POV, I owned a Moscode 300 for many years, driving Audiostatic 300 electrostatic speakers with ease and control. The ONLY reason I sold it was to buy a Cello Encore double mono 50W amplifier. And while the Cello is far more transparent than the Moscode, I sometimes still regret the glooming orange lights coming from inside the Moscode. But I don't regret having the Cello. ;)