You may want to check out the current issue of The Absolute Sound. There is an excellent review on the ELS amp by Innersound. This is not a tube amp but is specifically built to power the Innersound Speakers.
Upgrade, Tube Amp ESL Speakers
I'm thinking about taking the tube plunge and getting a tube amplifier(s) for my Innersound Eros. The Eros are an electrostatic hybrid speaker and have a nominal impedance of 4 ohms. I've narrowed the field of contenders to the Wolcott P-220M and the Sonic Frontiers Power 3. I'm looking for suggestions and recommendations between these amps and possibly other tube amps that can drive home the goods while delivering that tube sweetness and presentation. Do you know of any tube amps that mate well with ESL's? We listen mostly to jazz. Pre amp is SF Line 3. No 7-60 watt grandfather amp please.