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Old 18th February 2020, 05:48 AM   #31
6A3sUMMER is offline 6A3sUMMER  United States
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Many readers know about these subjects.
(But many readers do not).

Phase is an easy test if you have a sine wave oscillator and an XY scope.
A little time, a little patience, a little work, and you get the results.

But just be sure the phase of your reverse RIAA network is correct, including when it drives the preamp input stage, including the grid resistor, and especially the Miller Effect input capacitance of the input stage (and the varying gain of the input stage plate if it is driving anything other than a constant impedance across the frequency band). Any change of the plate load versus frequency will cause the gain to change, and consequently the
Miller Effect capacitance reflected back to the input will not be a constant either.

And remember, different cartridges have different DCR, different inductance, and the tonearm cable and coax from there to the preamp have many different possible capacitances.

Does anybody remember the Saddle-Back frequency response curve of the beloved Shure V15 cartridge?
Track-ability, Yes.
Flat frequency response, No.

Onion Layers indeed.

Last edited by 6A3sUMMER; 18th February 2020 at 05:55 AM.
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Old 18th February 2020, 04:39 PM   #32
Koifarm is offline Koifarm  Netherlands
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Just for info.
Below picture freq.response in green(with inverse riaa circuit). And phase shift in yellow of the phonodude.
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Old 19th February 2020, 06:49 AM   #33
6A3sUMMER is offline 6A3sUMMER  United States
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Koifarm,

Nice!
Smooth!

+/- 22.5 degrees from 10Hz to 20kHz.
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