OTL Tube Amps and Full Range Electrostatic Speakers


I have Martin Logan CLX speakers which have a nasty impedance curve in the treble with a minimum of 0.7 ohms at  about 18 to 20 kHz - or so I have read.  The impedance of the CLX is, as many know, largely capacitive.  Over the years I have preferred tube amps and have heard OTL amps driving various Quad speakers with great results.  My own experience with the CLX's has been more positive with high quality solid state amps; I am currently using a Krell 402e which has no trouble driving this speaker well.  An ARC Ref 150 did not provide the control, particularly in the treble, which this speaker needs and did not provide the level of transparency which this speaker can provide.  I would appreciate hearing if anyone has experience with other tube amps with the CLX's or Sound Labs, particularly OTL's and whether autoformers provided a significant benefit.  Thanks for any insights.
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Roger Modjeski of Music Reference has a conventional PP tube amp with 1 ohm taps that could probably drive the CLX. Worth checking out!

Exactly roberjerman, and the RM-200’s low output impedance is a bonus with the impedance swing many ESL’s present to an amp. It is also very stable into highly-capacitive load of most (all?) ESL's. A mighty fine amp, made specifically for difficult-to-drive loudspeakers.

Roger is now making a direct-drive OTL amp, specifically for ESL speakers, including his own. About $6,000/pr, I believe. Check the Music Reference website to confirm.