Hi there,the original Solarus was a one piece combo,the second version is the one you have,EL 34's (6CA7's) around 40 watts,no mid boost switch,7199 phase inverter,came with a partially open 2 x 12" cab,same size as a Sonaro 1 x 15" cab just a different baffle board and backboard.I prefer this version over the mid boost/6550 version,nice amp,good luck,Mel.