I can't help much, if at all. I'll try this, though.
I originally thought the Model T was named because of the T input, which went to both channels. In fact, it was so named because of the split-T inverter-driver stage, which was supposed to be much cleaner than the 6AN8 circuit it replaced. Apparently the 6AN8 circuit got pretty muddy when pushed hard with complex jazz chords. Wish I could remember where I read that. Anyway, if that's true, then the T input must have been added because of the name, not the other way around.
The Fender-era Model T, a completley different amp, was obviously (to me) named to take advantage of the original Model T's popularity and reputation.