Doesn't say much about their quality control if the devices are that
dissimilar.

FWIW, I have developed a semiconductor and tube curve tracer for use within
Multisim -- create the component in Multisim, plug it into the curve tracer,
run the test and compare with the manufacturer's charts.

I have also built a tube curve tracer -- same will apply for
semiconductors -- even published an article on it. With this i can compare
the characteristics of the device vis a vis mfr data sheet AND the
simulation in EWB.

Jack

"Roy Lewallen" wrote in message
...
Ah, but that's a model for just one BF998. The one you pull out of the
drawer might bear very little resemblance to it.

Roy Lewallen, W7EL

jack wrote:
FWIW, I found the following SPICE model for the BF998 on the web -- note
that the two MOSFETs VMAX are dissimilar, a lot of the entries are for
parasitic elements:
. . .