In Reply to: Re: Berning ZH270 or Seigfried compared to Atma-sphere MA60 posted by elektron on June 3, 2005 at 07:31:16:
Well, this is how DB apparently described its operation at one point:The ZOTL falls into a generic class of amplifier described by the acronym OTL both technically and in spirit. The power conversion transformers called out by the patent cannot and do not operate at audio frequencies. The semiconductor devices called out by the patent drive these transformers at a fixed 250 kHz and do not operate at audio frequencies or as amplifiers. The patented ZOTL circuit is a two-way coupling circuit that performs impedance matching like an audio output transformer, but does not have any of the limitations and distortions imposed by audio output transformers. This circuit is in no way a buffer, such as a transistor output stage in a hybrid tube-transistor amplifier. There is no power gain, and more importantly, the speaker “sees†the tube transfer characteristics and the tubes “see†the speaker’s dynamic characteristics.
Based on that, I could call his creations, not OTLs, but NOT's for 'Nonaudio Output Transformer Amplifiers'. There's still an output impedance/voltage transformation based on a transformer ratio, unlike in OTLs but as in conventional tubed power amps; however its achieved with high frequency solid state switching power techniques bearing some resemblance to those of Class D amplifiers.
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Follow Ups
- Re: Berning ZH270 or Seigfried compared to Atma-sphere MA60 - Tom Dawson 23:18:23 06/12/05 (5)
- Re: Berning ZH270 or Seigfried compared to Atma-sphere MA60 - allanbhaganinfo 20:11:05 06/14/05 (4)
- Re: Berning ZH270 or Seigfried compared to Atma-sphere MA60 - Tom Dawson 22:45:10 06/15/05 (3)
- Re: Berning ZH270 or Seigfried compared to Atma-sphere MA60 - allanbhaganinfo 14:51:24 06/16/05 (2)
- Re: Berning ZH270 or Seigfried compared to Atma-sphere MA60 - Tom Dawson 10:07:40 06/17/05 (1)
- Re: Berning ZH270 or Seigfried compared to Atma-sphere MA60 - allanbhaganinfo 18:46:21 06/17/05 (0)