Don the K3 PA and driver give some 10 dB better 3rd order IMD at around 
1/4 power. While that shouldn't matter on RTTY it might on other data 
modes and does on SSB,. so for my money I would opt for a linear that 
needs 15 ~ 30 Watts of drive.

73 Dave G4AON
K3/100 #80
----------------
<SNIP>
Intuitively it seems to me that the K3 might like the 15w or so, since 
the KPA3 is at the
bottom of its range and the fans can help with the cooling, even though it
is nearly 3 times the power needed to drive the 8410.
<SNIP>
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