The Super 400 is a 60 watt combo with two 12" speakers, an all tube
preamp on top of the cabinet (with controls), an all tube power amp
(2X6550) on bottom of the cab, 3 channels, on board compressor.
Scotty used one of these on occasion until trading it in 1972 for a Magnatone.
for more about vintage Gibson amps see "The
Gibson Amp Project"