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Re: Tube Distortion and Bias ... a perspective

Hi Mike,

Nope ... 845s for me.

Russ is right, the point is that generally in a properly designed SE amp the OP stage produces most of the distortion as the tube is loaded much more than the preceding stages in order to transfer power to the load efficiently. This is predicted by the load line on the plate curves. Imagine for a moment that we are driving the OP tube with the same type of tube with exactly the same load but in opposite phase ... cancellation! However the mechanism is completely different to PP amps.

Zero NFB was used but the low numbers are real. Admittedly the OP voltage level under test conditions was only 10V P-P on both amps, however you can sacrifice power for linearity by using a higher than normal impedance load. Many commercial amp manufacturers do not do this and either have to put up with high OP distortion levels or use NFB to correct things.

Rgds,
Naz

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