OTL Tube Amps-- are they superior to everything?


A recent conversation I had with an Audiogon member got me interested in OTLs. His opinion is that nothing compares to them for clarity, naturalness and superiority in just about every area. The Atmaspheres are the amps he has, and they are purportedly very stable, unlike most other OTL designs, which many can tell you were a living nightmare.

This is ironic, because some mfrs., like McIntosh, actually put output transformers on their better solid state pieces, claiming they provide superior sonics.

What is the truth here?
saxo

Showing 8 responses by allanbhaganinfo

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.
Tubegroover, Yes, the RF conversion transformer, is a transformer but Dude, again, like before, it's not in the signal path. So the signal is that of a direct plate to speaker output but this is achieved in the most absolutely ingenious and mind boggling way.
If you really study the design, you'll see that in fact it's superior to a regular OTL.
So maybe the best way to describe the ZH-270 is to say, it's like no other OTL, or there is no other OTL like it :)
Wow!!! TWL, you've been doing some reading :) but it's still even more complicated than that, if you can believe it :)
Twl, I would love to hear those amps of yours, I'll even make a effort to come and hear it, where ever you are :)

My amps are 6JN6 based but not a 270, they are direct drives, directly driving Sound labs, I have over twice the rail voltage of a regular 270 but a lot of the design is similar, this alone is a testament to the reliability and rock steady stability of the design, it's capable of producing 6000v peak to peak, yeah it only weighs 8lbs each, so not only am I OTL amp but I am transformerless on the electrostatic panels as well.
There is an open invitation to anyone to come and hear this, as talk is cheap
Oh boy, let's keep it to the topic, everyone is entitled to their opinion, that's for sure.
I think Saxo might not fully understand what a Berning designed amp is and maybe rightfully so, as this industry is full of BS an BS'rs, so if I was an outsider, I too would be skeptical of such a claim, so Saxo may be reacting just as I might, if I did not get to know this design first hand or at least still trying to get to know it, WOW!

Just a note, there is a number of highly regarded speaker companies that use the ZH-270 as reference amps, one being an Italian company, that makes some of the most beautifully finished speakers in the world, yet they chose this ugly duckling.
Saxo, if you're in Chicago, I know someone that can drop over with a ZH-270 for you to hear?? How about that, would that be cool with you :)
Just so that you can hear one, I would be very interested in seeing what you think.