here also is a rough typology that i noted dati:
Medium Power 6L6:
Tremolux, Vibrolux, Concert, Pro, Super Reverb, Bandmaster
High Power 6L6:
Twin Reverb, Vibrasonic Reverb, Showman Reverb, Super Six Reverb, Quad Reverb
Think of the line of BF fender amps like this.... Vibrolux Rev, Pro Rev., Super Rev., Twin Rev. Each step "up" is incrementally louder. Then mate the heads with their combo "brother." In same order, Tremolux, Bandmaster, Bassman, Showman.
Generally the transformer iron with these mates tracks equally. A little less closely, the plate voltages track as well. These two factors contribute the most to apparent volume of the amps.
