Hamhock75,
<quote> I plan to test the FLDX400 for IMD in the near future. The topology of amplifiers may favor tubes especially as power goes down. The push pull design has to deal with cross over distortion that does not happen in single ended tube designs <unquote>
That paragraph inferred that the '400 has push-pull output, but, of course, you are correct; it does not. It would have been more appropriate to say "A push pull design has to..."
I rather enjoy these discussions, so carry on!