## How to use ?

Simply change a tube reference, or the parameter (Vak, Vgk) or a graph dimension: its grid curves or its mutual characteristics will be displayed. The graph displays either Ia (Vak) with Vgk as parameter (grid curves) or Ia (Vgk) with Vak as parameter (mutual characteristics), after the mathematical model proposed by Norman Koren. Note that only the parameters of ECC82/83/88 are those proposed by N.Koren.

When any of the proposed solvers converges to a satisfactory solution (Vgk ≤ 0), the computed operating point is always located within the area delimited by the curve Ia @ Vgk = 0V, i.e. below and right this very curve.

## Trace anode curves of a tube