Someone (who shall be nameless) asked me today - What is the difference, tonally, between the 18 watt and the 20 watt Marshall? Buggered if I know - it's been decades since I played an 18 watter and don't ever recall playing the 20 watter. I know what the physical differences are but what are the differences in tone between them? And another thing can anyone find these amps on the Marshall website?? Thanks, Best, Pete.