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Feedback alternative

If you were to invert the phase of the driver transformer or output transformer (not both) you could apply the feedback to the grid of the driver tube rather than its cathode.

When you apply feedback to the cathode of any tube, the tube distorts the feedback while mixing with the incoming signal. This creates additional harmonics and can cause IMD as well.

If you mix the feedback passively at the grid of the tube this doesn't happen since the resistor divider network is far more linear than the best tube around.


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  • Feedback alternative - Ralph 13:07:12 11/07/24 (2)
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