LTSpice triode model

Basically there are two kinds of triode models, the Leach and the Koren. I favor the Koren models. I have found them to be reasonably accurate if you stay within normal operating parameters. Get too far away from that and the models get quirky.

Best regards,

Fred

I don't know (or care ;-) ) much about SPICE, but I know plenty about 12AU7. If plate voltage is over 1kV or so, I might expect to see some current at -80Vg. At any plate voltage, there will be some leakage, which should be much less than a miliampere, especially at -80Vg.

Tim

The above model is very wrong at Vg < -80V.

I've just found a better one on the same website:

Better in one way, worse in another :(

This manages to suck 22.8mA through a 68K anode load resistor from a 150V supply, giving an anode voltage of -1.4KV.

I'm now trying the Norman Koren models, which seem to take anode voltage into account and do sensible things at both extremes of grid voltage.

Thanks, Andrew! A whole set of very good links!

Now I'll have to re-visit my youth and design some tube amplifiers ;-)

...Jim Thompson

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I have seen power tubes with substantial anode current at -80 V Vgc, however this is not appropriate for a small signal triode like a