I just want to comment, aside from the particular speakers that you may encounter in the Super Reverb, I've personally had 2 Blackfaces and one Silverface. A 65 a 66 and a 68. Their circuitry are identical and they are almost identical in sound (again except possible different manufactured speakers). The amps that are compared here are a 67 AB763 and an 80 AA270 circuit.
Blue sparkle grille cloth w/ aluminum frame (68-69), w/o aluminum frame (70-81)
# A "Boost" control and a master volume were added in the mid seventies.
# A Mid control for the Normal channel and Line Out jack were added in ~1978.
Fixed, adjustment pot (AB763) or balance pot (all others)
40 or 70 (late 70s models) Watts