Can't comment on those, but everybody I know running stats prefers Wolcott Presence 220.
5 responses Add your response
The Wolcott Presence 220 may be a good match for electrostats, but so are the Monarchy Audio SE-160 monoblocks, a tube-hybrid design at less than half the price of the Wolcott. I haven't heard the Wolcott amp, but I doubt that it sounds better than the Monarchys. I used mine to drive InnerSound Eros speakers and I know that C.C. Poon, Monarchy's designer uses Sound Lab speakers.
I have also used the InnerSound ESL amp (both versions), and to my ears, the Monarchy units were preferred for their warmer balance and less fatiguing high frequency performance. I've never heard the Spectron Musician II, but before I bought one to drive stats, I'd want to know how stable it was driving such a difficult load. I've heard some otherwise great-sounding amps perform miserably when hooked up to the InnerSound speakers... so it's not something that one can take for granted.
Some time ago a friend brought over his Spectron Musician I to try with the Sound Lab U-1s. It did well, although I preferred my tube amps over it. Since then I have replaced those amps.
The Innersound amplifier is designed to drive ESLs, obviously optimized for their own speakers but very capable of driving Sound Labs and other ESLs well. For this reason I would suggest auditioning the Innersound.