Have just added a KSB2 to K2 s/n 6424, testing with an MH2 mic on 40M produced good signal reports. SSBA =2 SSBC = 2-1. However, am getting Hi Cur ( Cal Cur = 3.5 ) at anything above 8W. Reducing SSBA to 1 produces insufficient audio. By contrast, CW on same band can push 15 watts without Hi Cur. Any advice/suggestions would be appreciated. 73, Cur KB5JO