No but I have been in a lot of amps. You can open it up and compare it.....You can tell by the amount of gain that is there without opening the amps. Tite Gain and crunch cover a lot of the ground of the classic English amps (Marshall, Hiwatt, Orange, etc). All these amps are close in design and it has more to do with the amount of gain stages. Each have there own voice given by the variations......
http://www.harmony-central.com/Guitar/guitar-amp-evolution.html