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In Reply to: RE: Phase Shift posted by Triode_Kingdom on August 2, 2017 at 11:26:17:
The problem is, the phase shift is nearly constant at 90 degrees across the audio band, whereas attenuation varies as a function of frequency. Use of this circuit demands that we assume the shift to be inaudible across the entire range of attenuation, whatever it might be, and I don't think it's reasonable to do that.
I will agree with you on this. I wonder what the result would be if the 1M resistor was replaced with a grid choke. The resultant LC filter would be a 2nd order filter with a 180 instead of a 90-degree phase shift across the frequency band. Given a sufficiently large decoupling cap to ground, the same signal would appear (same relative phase angle) at the grid as it would at the cathode input. Of course this would be a feed-forward signal, but it might not be too detrimental given that it'd be very small.
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- RE: Phase Shift - sideliner 12:41:27 08/02/17 (0)
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