[Amps] "Tubes 201" - How Vacuum Tubes Really Work

[Will Matney]

Pay close attention when reading this about the only possible way a control grid could become positive. It's under the portion about how a triode works. The control grid has to be heated hot enough to emit electrons. Under normal operation, a tube will be at cathode potential Vg = OV, or under Vg = -10 Vdc, etc. This is a very long article, but a good one.

"Tubes 201" - How Vacuum Tubes Really Work;

http://www.john-a-harper.com/tubes201/

Best,

Will