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In Reply to: RE: I know, I know posted by 6AS7_6SN7 on November 05, 2009 at 00:32:36
The first Circlotron patent was by Cecil Hall. The second by Bongiorno and the the 3rd and 4th by Atma-Sphere. There was never an EV patent.
A lot of the distortion you are showing is likely coming from your driver circuit, not the output. If you tinker with the cathode resistor values of the driver (and use a bipolar power supply) you will see what I mean. CCS circuits will clear this up a lot. I would also explore what happens with different values of current limiting resistors in the output section.
The means for driving the power tubes is another area of weakness of this approach (which has been used by at least 3 manufacturers that I know of, only one of which is still in business). In practice, an amplifier like this will exhibit slow overload recovery, bias instability and/or weak bass, possibly both.
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