Stewart World 600?

I have not owned a 600, but I vaguely remember talking to a tech at stewart. because its "a/b" power amp it is using a more conventional power tranformer and coil type amplification. less efficient then the world 1.2, 1.6 or 2.1. that can be good or bad in extreme situations:

I heard a 2.1 bass amp user complaining about the class "H" system in his 2.1 when he plays venues with "bad" power (brown outs, dips in power from the wall) he loses volume and punch quickly. with an "a/b" amp you might not have as much sag in power because the amp will have capacitors inside that give you several cycles (not sure how many) of reserve power and then they are recharged as power come back up from the wall.

On overheating issues an A/B amp is less efficient and may run hotter, especially if you push the amp. you'll have to give it more space in your rack then a class H amp.

hope that helps and someone else might correct my mistakes, but thats how I understand the differences between the 600 and other stewarts.

600watts into 4ohms or 400w into 8 should be plenty for low to mid situations.

 

"Class AB" describes the output circuitry, not the power supply.

AFAIK, all Stewart amps use a switch-mode power supply.

 

I would definitely,definitely avoid the world 600. I had one, and it crapped out on me on every gig where it ran into a 4 ohm cab, and it crapped out any time it was in a rack,even if there was an empty space above it. i've heard lots of good things about stewarts, but I would avoid this model. It needs a fan to be effective; it has to have a space above it at the minimum, which means it's not really a one space amp; it can't handle 4 ohm loads. i had it crap out on a gig at the first note I played

To be fair, I bought this unit used--there may have been something wrong with it, althoug I had it checked out by an authorized local repair place