[Elecraft] High swr-- what is acceptable?

[George]

My homebrew linear amp (single 3-500Z) does not have a tuned input feature, and the swr when using the kpa 100 to drive the linear amp runs around 3:1.  I get a hi reflect message if I run over 50 w out to the linear amp.  Is this swr too high??  If not, what is a safe maximum swr??  I understand that when hi reflect is displayed, the output from the kpa 100 is reduced and I can live with that -- I just don't want to damage the K2.  


Thanks and 73, N4YM