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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: cloning the Fisher posted by Eli Duttman on January 25, 2015 at 15:34:13:
In that example, the source's output impedance at low frequencies is the parallel combination of the 100k plate load resistor and the plate resistance of the 7025 (roughly 75k), or approximately 45k, 10 times smaller than 470k.
Note that the capacitance at the output should include the load capacitance, which includes the Miller capacitance of the following stage.
In practice, there is usually a volume control pot between these stages, which complicates the calculation.
My point is that the 470k grid-to-ground resistor is not important for the Miller effect here.
Large grid-ground resistance can cause problems with grid current shifting the DC operating point.
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Follow Ups
- RE: cloning the Fisher - TimFox 06:33:05 01/26/15 (0)
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