Hi!
I am glad to greet you on the forum of Russian audio community.
Your the Ultimate audio amp had attract a lot of attention because of its perfect characteristics. (At least quantitative and I hope qualitative too.
)
Some questions arose simultaneously.
Main question of course is, how is possible to adjust the amplifier without your huge and expensive set of the measurement devices? Is it possible to do using an oscilloscope and audio freq. generator?
Second is, what was the design of the amp practically? Because for such ultimate low distortion the design plays crucial role. Some our experts confused about possibility to reach so high properties with the proposed design (at least how it looks on the photos).
third
After test of the amp I understood that you was not too happy about used MOSFET in the EC OPS. What may you propose now for trying at least: a BJT or other type MOSFET?
fourth I red the paper of prof. Howksford about error correction in output stage and have one question. Is this error correction something to do with the feed-forward error correction? Or, it is a pure feedback solution.
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