I strongly reccomend the KPA100 and the KSB2. I do not work a lot of SSB but it is nice to have around when one needs it. The KPA100 integrates nicely into the K2 and you do not lose you QRP capability, just keep the power below 11 watts and the amp is switched out automatically. It is great to have the QRO when chasing a rare one in a pileup. 73 es Gud Luck Jim W4ATK K2/KPA100 #4028