Other questions I have: What is the change in input Z of the grid above 0V? Does it come crashing out of the megaohm range like a typical triode? (To the gene

Other questions I have: What is the change in input Z of the grid above 0V? Does it come crashing out of the megaohm range like a typical triode? (To the general reader: The grid conduction and the bias shift that it triggers is definitely a part of a "real" amp sound. If you've heard anything that sounds like a swirling sound out of an overdriven guitar amp, this is bias shift brought on by grid conduction) Do you need to continuously source current to the grid like most low voltage tube cases What are Cgk and Cga? What are the curves like near cutoff, and are the slopes different due to a different grid geometry relative to a traditional triode? --- PS, if tube amps for music are interesting to readers of HN, but you have no background, there is an exceptionally lucid book on the topic: "Designing Tube Amps for Guitar and Bass" by Merlin Blencowe.