Can OTL's drive ribbons well?

In a tube amp, it's the output transformer that limits frequency response. Tubes themselves function nicely at RF frequency, and so do transistors for that matter. With an ultralinear circuit (with transformer secondary taps for feedback around the transformer) tube amps with transformers can be made flat to at least 20 KHz, and it is arguable whether higher response is necessary, since neither CDs nor LPs have signal content above this. SACD and DVDA may have higher frequency signals, but the audible effect is also arguable.

Hmmm..., LPs do have signal response above 20KHz...

In fact, this is one of the challenges for well designed analog front-ends: the cutting lathe can place a very high frequency sounds, including harmonic distortion, into the record grooves that then have to be dealt with effectively, for good and ill.

For some spectral analysis graphs, see:
http://users.bigpond.net.au/christie/comparo/part4.html
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It seems I just discussed this with Albertporter. I recommended that he consider the atmaspheres for his ribbons or for the ultimate in speed consider solid sate. I made the speed decision based on my audition of the Martin Logan Statement latest version dirven by Spectral electronics. Albert presented proof that his vtls were plenty fast. He is currently running Air tights on top.
If a picture is worth a thousand words a listen is worth an endless discusion. Get thee to a dealer and have a listen to the Bryston 7b with the magneplanr 3.6 or 20.

A very interesting thread as I will soon have an opportunity to listen to the Atmasphere amps with Electrostatics (SoundLab) and hopefully my Magnepan 3.5s if the dealer will allow me to lug them to his shop.

As for the suggestion to stick with ss for ribbons because of the lack of "speed" with transformer'd tube amps, I just have to disagree here. I did indeed hear the Magnepans at my dealer (Minneapolis) on both Bryston and ARC amps. It was absolutely yawn city with the Brystons. I just don't get it with all the praise from people using these amps with Magnepans. Without the "you are there" feeling, who cares about speed!

The Maggies bring on an incredible emotion to the music when driven by a number of tube amps that simply is not there with the Brystons. The hybrid (tube input / ss output) Counterpoint NPS400 far exceeds the Brystons in a most natural tonal balance and resolution. But the Wolcotts bring on a whole new level of natural decay of notes and 3-dimensionality beyond the Counterpoint.

I have no idea the quantity of "speed" of the Wolcotts. Until I hear an ss amp that can do what the Wolcotts can do, I will stay with what I have. And from what I have read from Rushton's many responses here, I can only imagine that the Atmasphere's would be another huge leap in this direction.

John

"fast organic liquidity with dynamics at around $4000 and hopefully much less(new or used)-- again specifically driving ribbon mids and highs?"
I don't know what associated equipment you were using with the bryston maggies or what your musical tastes are. I was listening to the Mark Levinson CD 39, 38 preamp bryston 7b and the ribbon tweeter maggies. The CD was Branford Marcellus duet with his father. So good that the salesman went out and bought the cd.
I think the 7b's were about $4k.
If you want to go all out like the $10k-27k atma spheres'. We can have a shoot out tube vs solid state.
If you pay attention, I have nothing but praise for the atma spheres. Wouldn't mind owning them myself. Those tubes must produce a beautiful glow at night. I just think transistors offer more speed than tubes. If you don't mind the softened transients of tubes please be my guess.