I have owned the Stardivarius for sometime and I could not find a tube amplifier that mated well with them. Although they sounded nice with tubes, after you hear the scale and dynamics of these speakers with a good power amplifier such as a Krell FPB700 or a cj Premier 350 you find you regret what you are missing with tubes.
Since you have an ACT2 I would suggest a Premier 350 - they can be found at nice prices at audiogon. Also consider factory upgrading your ACT2 to series 2 - it is expensive, but worthwhile. The new preamp is more musical and is even more spatial than the previous one and will match perfectly with the Stradivarius.
Since you have an ACT2 I would suggest a Premier 350 - they can be found at nice prices at audiogon. Also consider factory upgrading your ACT2 to series 2 - it is expensive, but worthwhile. The new preamp is more musical and is even more spatial than the previous one and will match perfectly with the Stradivarius.