Robert, thanks a lot! I look forward to using that 12AY7 model. And
your update of the 12AV7 model seems to be even closer to the real
thing, at least according to the circuits I'm simulating.

As for 12BH7: I've been using that same model you just posted, but it
doesn't work nearly as well as your models (probably becase it doesn't
contain the same level of detail). For instance, in a White cathode
follower circuit of mine, Circuitmaker is showing the ability to swing
+/-120V (peak) or more into 2400 ohms, while the real circuit can only
do +/-47V (peak) maximum into the same load before clipping.