I'll echo a few other posts. I have been using electrostatic speakers since 1978. Tube amps just do not cut it with this type of speaker even if you cross over to a woofer or subwoofer. The impedance drops with increasing frequency and they are essentially capacitors throwing voltage back at the amp. High power transistor amps just handle this better mostly because of their ability to control heat / handle current. If you want tube sound go with any Pass or Curl design. I think they are the best at making solid state sound like tubes. Parasound may have a reasonably priced one as might Pass labs.
If you have to go with Tubes use the low impedance tap.
Sanders Sound Systems has a great white paper on this topic posted on his web site.
If you have to go with Tubes use the low impedance tap.
Sanders Sound Systems has a great white paper on this topic posted on his web site.