I know that both the Beta Lead and Concert Lead amps are Solid State. I see that the Beta has a switchable 2-channel that can also be played simultaneously - where the Concert Lead seems to be a one at a time non-switchable channel.
I have seen videos (not the best for representing sound all the time) of both amps and they both sound huge and burly. I am looking at get one and I am hard pressed on which to get. I play metal; more Neurosis, Doom, Stoner, kind of stuff but with some cleans in there too.
I love the sound of both amps and I am just trying to get more information on the differences between them.
