OTL Tube Amps-- are they superior to everything?

One thing I forgot to say in all of my BS is that sometimes, I prefer the sound of my Jadis amp over the Atma Spheres. It all depends...

Trelja, are you referring to Paul Speltz ZERO autoformers? If so have you ever tried the alternative 2X configuration? I found this configuration was more nuanced than the standard configuration. There was a slight drop off in bass output though. I then used two pairs, alternative 2X on the high frequencies, and standard 2X on the low frequencies. This yielded absolutely phenomenal results on the N.E.A.R. 50Me II speakers I was using at the time. I would love to hear about your results if you happen to try this.

Saxo, as a multiple Berning owner, I can only agree with what tubegroover and TWL said regarding its abilities and advantages.
However, I'm not quite sure what you mean by the amp 'appearing and disappearing'. If you mean availability of the amp to buy used here on Audiogon, they certainly are less commonly available used than more mainstream products, but that does not mean that there is something 'wrong' with them. There was one available a week or so ago here; it isn't there now, but that's probably because when they come up, they sell fairly quickly. Actually, I was thinking of buying it myself to compare a 'solo' 270 to my monoblocked ones, but common sense reared its ugly head. Both of my Bernings were bought through ads I first saw here on Audiogon, in fact.

OTL, means output transformer-less device, does not mean "nothing between the plate and speaker terminal", then it would be NPST or something like that, some OTL designs may use caps or resistors in between the plate and terminal, in fact some highly regarded units may do so.

The ZH-270 is an "OTL" amp in every respect of other "OTL" amps, just that it does it in a very high technology way, or different than anyone else.

Ok Allan, but it seems we have had this discussion before. But I ask you this, if an inpedance converter is not a transformer of sorts, what exactly is it? Also true that some OTL's have a cap or resistor between plate and terminal but none have an impedance convertor or transformer, agreed? ;)