I used to own Virgos powered by vt100 mkI with Terra subwoofer. With the Terra they sounded better with vt100 mkI than mkII! By themselves they sounded best with BEL (Brown Electronic Labs) 1001 MkVs. These amps are hand tuned solid state pure class A 200 watts mono or 50 watts stereo which will still power the Virgos incredibly well. I have already sold my Virgos but still have the BELs for sale. I am totally biased but just as the Virgo defies belief so the BEL astonishes.