I bought both my 600's in the late 80's and had the first one modified in the 90's.
There are a number of advantages to the modified amps. Better binding posts, and inputs as mentioned above. The protection circuit is taken out of the audio path, and on, and on.
But even the stock amp is very good.
You can come very close to the current Moscode at a fraction of the price. Some of the mods are easily done by a moderate DIY'er.
If modified (by George) you can do a lot of tube rolling.
I have Russian NOS (1979 & 1982) 6H30p-DR in the input positions and Ediswan NOS EC88 in the driver position of the channels connected to the stats and 6GU7 in the drive position of the woofer channels.
Tube regulation DOES make a difference (therefore the 600). With Martin Logan Prodigy and ribbon super tweeters I still don't hear MOSFET mist. It could be my ears or my setup with the modified amps.
Perreaux, Belles, Pass and other well thought of (including the new Moscode at $6,500+) use MOSFET output.
Just as SS doesn't necessarily have to be hard and brittle or tube don't have to be sweet and gentle. I don't believe all MOSFETs have to be "misty".
My system with two modified NYAL Moscode 600's;
http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1200440547&
There are a number of advantages to the modified amps. Better binding posts, and inputs as mentioned above. The protection circuit is taken out of the audio path, and on, and on.
But even the stock amp is very good.
You can come very close to the current Moscode at a fraction of the price. Some of the mods are easily done by a moderate DIY'er.
If modified (by George) you can do a lot of tube rolling.
I have Russian NOS (1979 & 1982) 6H30p-DR in the input positions and Ediswan NOS EC88 in the driver position of the channels connected to the stats and 6GU7 in the drive position of the woofer channels.
Tube regulation DOES make a difference (therefore the 600). With Martin Logan Prodigy and ribbon super tweeters I still don't hear MOSFET mist. It could be my ears or my setup with the modified amps.
Perreaux, Belles, Pass and other well thought of (including the new Moscode at $6,500+) use MOSFET output.
Just as SS doesn't necessarily have to be hard and brittle or tube don't have to be sweet and gentle. I don't believe all MOSFETs have to be "misty".
My system with two modified NYAL Moscode 600's;
http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1200440547&