Originally posted by guitarzan
The biggest difference between Vox & Marshall tone IMO is brought about with Marshall using global feedback but Vox using no NFB, aka open loop. There are way more than 5 things I can think of that are also different; Tone stack, cathode Rs & bypass Cs, Blocking caps, phase inverter, master volume, topcut/presence...
It's true - there are a lot more variables at stake than just one switch... the Vox/marshall switch would just change the filtering in the tonestack really.. I will also have switching on the feedback circuit, and a cathode/fixed bias switch.
I'm hoping that it will be possible to get close enough to almost any amps tone by tweaking the switches in the preamp and power amp to closley match the circuitry of the amp I want to "dial in." I could also math it precisely if I wanted to by just swapping cap values and such. (This is why I wanted to go with screw terminal strips - EASY modification)
Yes, its crazy, yes its complicatied. But I want to be able to hear the difference that different circuit comtribute to "tone", and in many cases A/B them, without having to buy 7 amps!! (Although I have been thinking alot about the Vox AC30CC head...)