Back in the day(mark series amps) you ordered a basic 60 watt 1x12 combo and anything else was an additional option that got added on to the price if you wanted them ie reverb,graphic eq,simul-class,60/100, different custom finnishes etc,etc.Like all the mark series amps(except the mark 4/5) you could have a1x12 or 1x15 combo or the matching head ie short or long, the long /1x15 version could be ordered in colliseum format(180 watts!...6 output tubes!!!)but the short could be a 1x12 combo, short head or rack mounted.If the amp has reverb, graphic eq, export transformer as well as the power output are all marked on the side of the metal amp chassis which can be taken out and is inter changeable with any of the matching long/short options depending on if your amp chassis is long or short....hope that helps.