If you didn't know which amp was in use wouldn't that count as a blind test ?

With speakers you sometimes need a screen so you can't identify which set is playing based on where the sound seems to be coming from, but with an amp I figure all you have to do is tape over the clip indicators.

I hear most people do that anyways, just like the OIL light on the car laugh

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8