Ed if memory serves me correctly the k2 was a qrp rig versus the 590 which
is a 100 watt rig. I can't recall if the k2 comes with the 100 watt
amplifier or whether it now is included. I think you can compare receiving
characteristics of the two radios side by side but not the transmitting
characteristics unless they're both 100 watts. 73- pat kk3f