Friedman uses a bunch of high end snubbers in his amps. He also uses a much larger cap between the sides of the PI output than Marshall. On some amps, he also uses a cap around the NF resistor to reduce high end. That's why his amps tend to be dark. It's also why they aren't as touch...
JEL still has some of the Friedman high end reduction stuff in it; I removed that on mine. I remove the high end killers on all my Friedmans, makes them much more touch sensitive.
My PT that I modded quite a bit. Clean Channel, Dual Masters on both channels, Dual Gains on gain channel, switchable loop, a bunch of tonal options and some circuit changes. I have a midi jack in back and a 4 button footswitch so that everything is footswitchable.
The thing you run into when...
Played one. Actually, sounds HUGE. Very fat, warm. Yes, it's dark ish, I had treble at 3 o'clock, but it DOES sound like Steve Morse, that's his tone. Very touch responsive, which is extremely hard to pull off in a darker amp. Gobs of gain available, I had gain at 9 o'clock. Excellent...
How's the neck angle? Can the action go super low without bottoming out the saddles? I've occasionally seen carvins where the neck angle was too shallow.
Were you around then? Techs who really knew how to properly mod a tube amp were rare, and if you could find one, it took forever..
That's the primary reason I learned to do it.
Fender tone stack FEEDING several more gain stages isn't intuitive for most to this day. Hence the millions of...
Very simple.
I actually always do 2 switches. The stock switch does 3 levels of Rk on stage 2, and the lowest value/highest gain adds a Ck. So you get vintage gain, a bit more, and holy F. I do the same 3 resistors on one switch, and put the Ck on it's own 3 way so it can be on, off, or...