I've messed around on quite a few jtm45's and they are wonderful amps. They do that thick clean strat thing better than just about everything out there. On the marshall website they quote hendrix saying "I love my old marshalls, theres nothing can beat them" or something like that.
I used to always wonder why he'd change his model amp so much. Cuz if you think about it, if you have a really good piece of gear - youre gonna use that sucker year in and year out. Hendrix seemed to use the newest marshall available every year. 67 68 (fender period) and 69.
But by him saying he loved his "old" marshalls maybe he really dug the jtm45/100 in the studio and since they werent being made anymore he just used the modern stuff to go out and get banged up on the road.
Apparently hendrix had a light modification done to his jtm45/100 amps which allowed a little more treble and gain.
Alright well good luck with it man I hope it turns out killer!
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By the time i return home i should have all the nos parts there and the stuff from metro amp store and probably marstran trannies will be ordered right after that. (still looking for alternatives for the transformers though - one of them being Ingo from ex Shinrock - but i'm not sure if he also makes an authentic PT (the OT is listed on his site).