If you want the clarity, quietness, speed of the SIT-1 with superior tonality and spatial presentation in SET, an Audion amp is perfect, and I have to say best.
In your price range you can choose from a simple 300B stereo power amp at $5.5K, up through $18K and any choice would best the SIT-1, by varying degrees. Since you are interested in 300B and alternatives, the DUO is interesting for you at $6K as it can run 2a3, 45 and 300B at your discretion. But you can trust you'll get excellent sound from a 300B, so given your price range, stepping up to the Golden Night monoblocks at $10K/pair is the sweet spot. 10w each amp, all silver wiring, wide-band OPTs. These amps ship with JJ 300B tubes. Put them aside as spares and spring for a pair of KR 300B balloon glass. That will give you high integrity in the bass region where so many 300B amps fail. Midrange tonality, dimensioning and detail are beyond reproach. Top end is extended, spacious, harmonically legitimate and top-to-bottom speed and dynamics are consistent (and *fast*).
There are PSET alternatives, PX25 variants in the line, and 845 monoblocks. If you want plenty of dynamic headroom, the $14K/pr. Black Shadow II 845 SET monoblocks and the $18K/pr Golden Dream 300B PSET monoblocks each output 24 watts. The 845 has a ton of shove but you don't absolutely need it with the Voltis. The 300B PSET Golden Dreams have more power than you need but that amp is musically gorgeous, harmonically complete and full of realistic nuance, so the circuit is worth the overkill.
Phil
