Nope. He built the three amps for my studio, so they are extremely touch sensitive, but not voiced for a single player, because the idea was for them to serve the studio clients at the time. So they are absurdly versatile.
He would do that for the buyer who would be the only person using the amp, tho.
Mine ones were more like the ones he built for himself, so he could loan them to artists for recording sessions in LA.
Matter of fact, mine Ultra-Phonix is a dead on replica of his personal 67 Dual Showman, which turned out my all time favorite amp ever.
He built a Marshall for someone I knew in LA, September 2003, and I've seen that amp right after Alexander delivered it to the owner. It was a 76 50w Marshall 4 input. The buyer asked Dumble for a great sounding stock plexi Marshall, not modded for high gain at all, just a great sounding Marshall. So Dumble asked him for the 76, because it was the cheapest one available, and rebuilt the entire amp from scratch, including designing new transformers for it, that he asked Mercury Magnetics to build. When he showed me the amp I told him that a Marshall modded by Dumble was by dream, and he told one day I would own one. October last year, exact 20 years later, I've bought that very same Marshall. It's the one in the video below.