Tube DIY Asylum

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RE: Other Methods IT

Posted by Triode_Kingdom on March 4, 2017 at 18:42:25:
"Even in A1 the driver tube must be able to deliver power, not just voltage, to satisfy the Miller capacitance"

The need for a low-Z driver regarding Miller capacitance has to do with dissipation in the driver, not the need to deliver power to the load. Like any pure reactance, Miller capacitance doesn't consume power. Rather, the circuit's dissipation results from the resistance of the driver in series with the Miller capacitance. Current into the Miller capacitance causes power to be dissipated in the driver's series resistance. Reducing that resistance serves to reduce the dissipation (and the frequency-sensitive voltage drop). No power is delivered to the load in any case.