It is clear form this that any aplifier iwth any form
of AGC is not
 linear. 
 Right.  What's puzzling me is where the nonlinearity comes from in
 the FET-based version.  [...] 
  Any amplifierr with AGC, n matter how it's
designed, is non-linear. 
 
Right.  What's puzzling me is where the nonlinearity comes from in the
FET-based version.
   I should check
model numbers; I might even have a 200A. 
 That would be fun. 
 
It would.
I'll probably be able to check sometime early next week; that's the
next time I expect to be within easy reach of those things.
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