[sdiy] Tubes in Spice ?

[Malcolm B. McIntosh]

Try here:

http://www.duncanamps.com/

Mal

Michael Buchstaller wrote:

> Hello group,
>
> this weekend i decided to give the circuit simulation with Spice
> another try. I tried the B2Spice editor package, as it comes
> complete with some common tube models.
>
> As long as i stay with the grid voltage within the usual limits, it
> woks ok and gives results as expected. But i want to grossly
> overdrive the circuits to see what happens.
> But, when i bould a simple amplifier, i note that there is negative
> output when whe grid voltage is higher than the cathode voltage.
> This happens with all included tube models. Even when i replace
> it with ones downloaded from the fabulous DuncanAmps page,
> this happens, too.
>
> When i replace the tube with a transistor, it works fine; no negative
> output voltages.
>
> Am i doing something wrong here ? Or are there any models that
> do behave correctly ?
> Please forgive me, but i am not deep enough into spice modelling to
> know how to create a new model with the characteristics i want.
>
> Maybe someone has a fully working triode model ?
>
> -Michael Buchstaller