This circuit follows the procedure described in the following paper about modeling triodes in simulation.
https://web.eecs.umich.edu/~mmccorq/diversions/simulation/index.php
I didn't really have any time to really read through the paper yet, so the presentet circuit might not be identical to the papers suggestions.
I changed the VCCS to a VCVS for better readability of the circuit, but didn't adjust values yet.
This paper might be interesting for users that are trying to simulate any tube (triodes only) related circuits.
