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Old 12th January 2009, 11:23 PM   #1
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Default Estimate Miller of Triode Strapped Pentode

Is there a good method to estimate the Miller capacitance of a triode strapped pentode?
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Old 13th January 2009, 01:43 AM   #2
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It makes sense for it to be Cg1g2 X stage gain. I'm guessing that the plate is too far from g1 for there to be a significant capacitance between them, but I could be wrong.
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Old 13th January 2009, 02:29 AM   #3
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That sounds right to me; after all, that's the idea of a tetrode in de foist place, no?  The problem would be to find this capacitance.  The datasheets very seldom give such data for trioded pentodes; we're lucky to get plate curves.

I wonder, would this spec have to be tested for on a hot tube in-circuit, or could we just stick an LCR meter on the appropriate pins on a cold tube sitting on the bench?


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Old 13th January 2009, 05:27 AM   #4
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Hi Ponz,

I don't see why the tube has to be hot to get this measurement. Temperature would make a difference, I suppose, but it should be slight.
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