> Three-tone is good for testing distortion in conventional amplifiers,
> however, if the screen voltage remains constant during the three-tone
> test in a G2DAF amp. (which seems likely) it would not pick this sort of
> thing up. The best test is probably ordinary speech since it produces
> wide changes in the screen potential in the G2DAF circuit. .
However, if the three tone test is PROPERLY designed (with two of the
tones very close together) the screen voltage will vary at a semi-sylabic
rate and produce the wide variations in screen potential. Similarly,
the properly desigsed three tone test will stress most power supplies
and document IM and other problems due to poor power supply regulation.
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