Re: Currently dealing a Sunn Solarus head....
if my memory serves me they have 4 imputs, and are set up kinda like a Marshall (older) with reverb and tremolo. They have a pair of 6550's(I think) are are loud as hell. Sunn amps are NOT crunch machines, they have a cool clean tone...different that a Fender but still good. If you crank them they get this cool fudgy kind of overdrive (Leslie west used to use Sunn amps) that is very cool. Sometimes they use strange tubes (6AN8's and I think some of them even had 12DW7's but that might be wrong). As a rule I would say that Sunn amps are very built and are worth lots more money that they bring.