[Amps] Why hasn't solid state replaced tubes?

[Zyg Skrobanski]

>IMD (splatter) is not considered spurious emissions by ICOM. All that tells
>you is harmonic suppression.

Is the IMD normally measured by using a two-tone test?  If so, does the
particular frequency of the tones (within a normal audio 3KHz bandwidth)
change the IMD, i.e. which two tones would give the worst case reading?
--
Zyg AF4MP
Roswell GA USA