This is more directed to anyone who may wish to experiment with Ed's guitar tones:
The beauty of a cathode-bias circuit is that there's no lag-time in the attack. That sense of immediacy cannot be duplicated with a class AB amplifier. Cathode-bias is the purest method of amplification = superior tone! (there is also se class A) I compare cathode-bias and class AB in the same way one would compare a Marshall JCM800 to say an AxeFX. With any digital rig, there's always a nano second of delay that it just audible enough to be noticed. This is what is referred to as a "disconnect" between the player and the amp itself. At least to anyone who has an experience with playing a real tube amplifier that is... Going from cathode-bias to class AB is very similar. In a class AB amp, the tube remains in an "idle" stage until called upon... Cathode-bias amplifiers remain in a constant "run" mode, so there is no sense of what some refer to as "tube gating". Is this actually audible? I don't know? I do know that there's a definite sense of satisfaction when I play out of a Matchless, Vox, D/13, Cornford, Snider cathode-bias amplifier!
Most of the so-called "Jose" amps are based on Ed's VH II rig. To many, there's no difference between his tone on VH I and VH II - hence the logic behind the endless barrage of "VH tone clips".
Since Ed was using a PPIMV in his Marshall for the VH II sessions, and then "went back to his original rig..." - what was the rig? That's right... A VOX INTO A MARSHALL. ACCEPT IT! And please don't insult the readers with the "distortion form his fingers" BS...
Yes, preamps run in class A - then class AB when amplified through the back-end of say a Marshall amp. That's the "bottle-neck" so to speak. So one would think that you could duplicate the VH I tones through any amp - right? No! Power-tubes pushed into distortion have a totally different tone signature when compared to 12AX7 tubes. Voltage, current, plate, signal compression all play a role in the final output tone. I told Steve that if he can't hear the difference between 12AX7 tube distortion vs. EL84 power-tube distortion - then God Bless him! It's that much easier to obtain a tone that's pleasing to him. For me, the VH I tone is IMO "the tone of the Gods"! Even Ed dropped the Vox/Marshall rig in favor of a Soldano SLO100 - and no, I don't know what he used live? I heard that he did use the Vox/Marshall rig for "Me Wise Magic"? Bottom-line is that Ed could make a "Gorilla" amp sound like a million bucks!
Have fun experimenting...