I have seen reference to different output tubes as being hard to drive or harder to drive than some other tube. Am I correct in deducing that the factors that make a tube harder to drive are
1. Required voltage swing for full output.
2. Input capacitance (miller) requiring higher current driver.
Are there any other factors that I am missing? To determine whether your driver circuit is adequate for driving a certain capacitance can you calculate it based on the time constant of the grid resistor and the miller or is there another method?
mike
P.S. There are not many IDHTs out there are there. I have found only 6S4 and 6AS7.
1. Required voltage swing for full output.
2. Input capacitance (miller) requiring higher current driver.
Are there any other factors that I am missing? To determine whether your driver circuit is adequate for driving a certain capacitance can you calculate it based on the time constant of the grid resistor and the miller or is there another method?
mike
P.S. There are not many IDHTs out there are there. I have found only 6S4 and 6AS7.