Mine was an Audiovox Sound Exploder. More of a power booster really. It was about as big as a modem and the box said it was 1000 Watts. I was always afraid it was going to blow up my Audiovox 600 Watt 6 x 9"s. Never did though. That was in the '60's.
Modern day is going on right now. My first two amps that I just got are a Genesis Profile 5 and an Arc SE2600. They're a lot bigger than the Audiovox power booster and probably over 1000 watts total. I'm thinking that my trusty ole' Audiovox 6 x 9's ain't gonna hold up. Probably need to upgrade.