Here is a demo of my 1967 Gibson GA-35 RVT Lancer 112 Combo Amp. I'm using a 1967 Hofner 459TZ Beatle Hollowbody Guitar for the demonstration.
Tubes (from left to right): OA2, 7591 (power), 7591 (power), 12au7, 12ax7, 6eu7, 12au7, 6eu7
There aren't any other tone demos of this amp online that I can find, so this should be instructive for those of you curious about this model. This example has had a cap job done and a general testing, and has no modifications.
This amp is quiet running with good cleans, nice reverb, and nice tremolo. It has a spongy, Fender like quality when cranked. A solidbody guitar with hotter pickups, like a Les Paul, would increase the breakup response, for sure, while a Strat or Tele would bring out even more country twang.