Here's a vacuum model (can you tell the author is Italian?) which I am

trying to shoe-horn into EWB (Multisim8) -- of course PWR and PWRS isn't

supported for the VCCS , but (1+SGN(x)) can be employed. I have pulled that

portion apart and it works. It's the VCVS which is causing the program to

terminate. The model purportedly works in SwitcherCAD. Instead of passing

the capacitor and resistor PARAMS I insert the values where appropriate.

I have gotten other vacuum tube models to work in Multisim8.

..subckt 6dj8i 1 2 3 ; placca griglia catodo

+ params: mu=28 ex=1.3 kg1=330 kp=320 kvb=300 rgi=2k

+ ccg=2.3p cgp=2.1p ccp=.7p

e1 7 0 value=

+{v(1,3)/kp*log(1+exp(kp*(1/mu+v(2,3)/sqrt(kvb+v(1,3)*v(1,3)))))}

re1 7 0 1g

g1 1 3 value= {(pwr(v(7),ex)+pwrs(v(7),ex))/kg1}

rcp 1 3 1g

c1 2 3 {ccg}

c2 1 2 {cgp}

c3 1 3 {ccp}

r1 2 5 {rgi}

d3 5 3 dx

..model dx d(is=1n rs=1 cjo=10pf tt=1n)

..ends