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Well; two of the legs -IIRC-  are the same.  But you are right.  After all, the GasFet is a FET.  Not a bipolar transistor like the 2999.  They are not direct replacements.  A FET requirements would need to be met first, and then it would work.   Some circuit changes would become necessary, IIRC.


Don't think that impedance is the issue, because the FET's have a very wide range. 

But the voltage requirements would be different.