Why not use Roger Sander's own ESL amps specifically designed to drive difficult electrostatic loads?
This amplifier will deliver more than 2000 volt-amps per channel into an ESL, and when driving magnetic speakers, the ESL amplifier will deliver over 360 watts/channel into an 8 ohm load, into a 2 ohm load exceeds 1000 watts.He's got a used pair of monoblocks for sale on his sight for almost 40% off and just a little more than a new stereo amp