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    Building, troubleshooting and testing of these amplifiers should only be
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Estimate Miller of Triode Strapped Pentode

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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?

Aloha,

Poinz
AudioTropic
 
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