Using tube amp with electrostatic speakers.

by far these panels are far better controlled with the High Current of a Solid State
Amplifier, where Vacuum tubes are Voltage driven .Current is what you need
to get ultimate control ,with a Vacuum tube preamp  you can still have the sonic signature  you want. I have used 100wpc tube smps with them but dynamics suffer say compared to a Pass labs 350 power amp.

Some of this bit of text appears to be a bit open to interpretation; if my read on it is correct than the basic implied statement here seems to be false. A high current amp does not do most ESLs justice. This is simply because there are no high current requirements.

Here's a bit of math: A Sound Lab, reproducing a tone at about 30Hz, with 200 watts to reach the desired sound pressure, will have a current flowing though it of about 2.6 amps. That's not a whole lot. The current myth is debunked. All that really happens with 'high current' amps (which is often a misleading descriptor in its own right) is a tendency to be bright, due to the 10:1 impedance curve exhibited by most ESLs.

Dynamics: in 90% of audiophile conversation usually the word 'dynamics' refers to distortion rather than actual dynamics. Usually the distortion involved is higher ordered harmonics (5th and above) and often in trace amounts (as far as a distortion analyzer is concerned). The human ear/brain system converts such distortion into tonality and also uses it to determine how loud a sound is, so an amplifier that makes greater amounts of higher ordered harmonics often tends to sound louder and also sometimes more 'dynamic' than an amplifier that does not make these harmonics in such quantity. Its a long-known fact that tubes make less of these harmonics. However, the impedance of the speaker also plays a role. A 350 watt solid state amp driving a Sound Lab will make about the same power as a 90 watt tube amp due to the impedance curve of the speaker. So the final statement of the quoted text also appears to be highly questionable- a lot depends on the ESL being driven!!

Bag, You wrote, " Firstly, I never owned any versons before the IIz, and only heard a friends I many times as he sought to find an amp to drive them - Jadis, ARC, Krell, yada yada - he sold them. The Scintilla's are the only speaker that was harder to drive and that's my experience in my 45 years in the hobby. "

I hope you don't think I disagree with what you say.  The IIz was a failed attempt to correct the impedance problems with CLS II, and the "z" mod didn't do much good.  My only point was that the original CLS, before model II, was the best of the bunch sonically and was an easy load for any tube amp. No one would recommend a tube amp for the Scintilla, of course.

We aren't quite in agreement, but in this hobby with so many people dying to disagree, I prefer to agree, or to find other people's ideas interesting and hopefully charming. 

Keep writing.

Well, we agree that the CLS IIz was best driven by an SS amplifier, and I added that this is because M-L were targeting such an audience and told me point blank that they were not interested in building a speaker for tube amplifier aficionados.

I have had Acoustats since 1980. I used solid state for many years but a couple of years ago tried them with a friend's Dynaco mkiv tube amps. The transparency was like I had never heard before. Even with the 60 watt amp, I preferred it over any of the solid state amps I had used. I now have a pair of VTL classic 300 amps.
 The VTLs have tremendous power supplies and are a perfect match for the Acoustats. They now are capable of dynamics that i have never experienced before. At the same time a much lower sound floor with bass and transparency that solid state amps can't even come close to revealing.