Submitted by imre on Fri, 09/25/2009 - 22:50.
I did a little looking into how the versions were different. Version 3 definitely sounds better - higher gain and less muddy than Version 1. The bigger output transformer must've cleared things up a bit. The output transformer primary impedance was also reduced to 5000 ohms (Version 1 was 7500) ohms. This is a much better match for the high current 6BQ5 and I'm sure it gave it some of it's additional clean headroom. Here's a link to some more info:
www.ultimate-guitar.com/forum/showthread.php?t=800422
I have some voltage Measurements somewhere... read more »