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In Reply to: Berning ZH270 or Seigfried compared to Atma-sphere MA60 posted by oracle on May 29, 2005 at 18:49:26:
Correct me if mistaken, but isn't the Berning ZH270 (Seigfried too) using the tube merely as a device to obtain a voltage amplification analog signal which in turn is used to drive a sophisticated active voltage to current converter employing mosfets and other active devices? In other words the behavior of the tube becomes the signal analog to influence the active voltage to current converter which is entirely solid state. To call Berning's amplifiers OTL is a misnomer. True they do not use transformers in the conventional way to change voltage swing in output tubes which would like to see a very high impedance as load, but calling them OTL is wrong. To do so one would then have to call any amplifier that used tubes on the front end and transistors on the output an OTL, and this is plainly wrong. OTL refers to a tube amplifier that does not use an output transformer to couple the amplifier to the load. Also, it should not use active transistor, fet, mosfet, or other active solid state devices to couple the tube to the load. I think this fuzzy OTL thinking came about as a result of misinformed reviewers who wrote out of ignorance or carelessness. Unfortuneately there is a lot of tripe that gets put into print at the hands of reviewers.
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