[Amps] Solid state amp high SWR distortion

[John Simmons]

I'm converting from a tube amp to a solid state amp. I've seen 
references to increased distortion caused by a solid state amp when the 
SWR is high, not high enough to cause reduced (foldback) power. Can 
anyone point me to hard numbers (not folklore) on this? For example, say 
the amp's IMD is -40 at 1:1 but increases to -35 at 1.7:1. Do you need 
an antenna tuner is your SWR is less than 1.5:1?

73,
-John NI0K