I have SC-IV's and use Plinius M16 pre (some might prefer a tubed preamp) and SA250 Mk-IV, though the SA100 is probably plenty of power with 91dB efficiency and 6 ohm impedance of the SC-IV. I have a Bryston 4BST, but the Plinius is much better (more revealing, open and transparent). I heard the Spectron but with VonSchweikert VR4's and thought it was a great amp for the money, but did not soundstage as well as the Plinius and didn't seem as open. To echo another's comment already entered, yes, Dunlavy says they get excellent results with the Spectron(but do not openly recommend it-may tick off other manufacturers.)BelCanto also just released a digital amp (the Evo.) You may be able to demo the Spectron as I did (call the company and ask for the demo dealers in your area- they ship the amp in a wooden crate and you get several to 7days to listen.) GOOD Luck!!!