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Original Message
RE: help with Grid Choke selection
Posted by Paul Joppa on September 18, 2016 at 01:15:16:
This circuit is not much mine, I just adapted an existing circuit to use MQ products in a parafeed output. The pentode driver output impedance is very high relative to a more usual triode driver, being dominated by the 91K plate resistor. This makes it very susceptible to leakage capacitance in a grid choke, potentially limiting the high frequencies. Maybe Mike knows how much capacitance there is?