Vacuum Tube Curves in 3D 

This was very interesting and informative. I've never seen this way of looking at tube curves before, and provides much more info than the simple 2D datasheets do.

Awesome, thank you 😁

Awesome!

Great video. It would be great to build a physics based model of the vacuum tube of interest and then interrogate the model in the time domain to generate predicted behaviors from which these steady state performance curves are derived. I’ve been working on a virtual test bench to do just that. This virtual test bench would cycle an operating variable (plate voltage in this case) thru a range of values while holding another operating variable (grid voltage) at a constant value (aka incremented boundary condition). The next cycle would repeat the same way but with a new constant value for the boundary condition. In effect the interrogation is automated and the a plot of a family of predicted performance curves can be made. Doing this would test the validity of the physics based model by comparing prediction for performance curves against performance curves from measurement. The physics based model doesn’t even have to be in the same physical domain as there could a hydraulic equivalent of a vacuum tube. This “model” would be used to enforce the thermionic effects of a vacuum diode in a model of an electrical continuity scheme consisting of capacitors and inductors and resistors. Once the model accurately predicts the thermionic effects for a simple diode then the control grid effects could be added to modulate the current as a result of the thermionic emission effects.

Thanks for the video. Very helpful. Is the plotting software you use (made) available?