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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: The load teh MC should see should be at least 10 times it's own coil impedance. posted by Eli Duttman on May 19, 2012 at 14:05:40:
The resistor that participates in the Miller effect is not the grid-to-ground resistor, when the stage is driven from a lower impedance.
Instead, it is the source impedance, which in this example is scaled up by N^2 from the output impedance of the cartridge. If we are designing for >10x coil impedance as a load, then the Miller resistance is <0.1x the physical load resistor (grid-to-ground).
For a MM cartridge, this source impedance can be inductive at high frequencies, which can make for interesting interactions with the grid-plate capacitance.
Edits: 05/20/12
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- RE: The load teh MC should see should be at least 10 times it's own coil impedance. - TimFox 13:21:46 05/20/12 (0)
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