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RE: feedback suggestion

Posted by Ralph (M) on November 22, 2023 at 09:59:26

In Reply to: My 2008 DIY OTL posted by cellailuca on November 16, 2023 at 10:58:44:

If you invert the phase to the output section from the driver, you could send the feedback to the grid of the input tube, mixing it with the incoming audio using a divider network.

The advantage of this is that the input tube isn't linear, so when you apply feedback to its cathode, the feedback signal is being distorted by the tube. his results in higher ordered harmonic generation (Norman Crowhurst wrote about this 65 years ago, but didn't propose a fix).

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