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Hey, anybody try replacing 12AX7s with 12AT7s in their TC? I read that John Petrucci swears by placing a 12AT7 in V1 in the Boogies he's used (if I remember that correctly). Well, I replaced V1 with a Groove Tube 12AT7 and it provides a more focused, less hairy distortion but drives really...

Okay, so new to the forum but a long time Boogie user except I haven't played a Mesa Boogie for 20 years! Yes, I'm 60 but I assure you I can hold my own. To the story...Since the late 70's I've played mostly Mesa Boogies except for a couple stints with a Marshall JCM800 in 1980(?) and a Marshall...