Having had both a Johnson Viking 2 and a Heath Apache and even a DX 100 that never worked, In my opinion the Apache was the most solidly built. For a rig with a pair of 6146es The Apache was the heaviest and seemed to just have the best quality! And I love Johnson too. Also If you're really into understanding the different classes of amplifier the SSB adapter takes the buffer output and feeds it thru a genuine phasing type SSB modulator operating at final frequency and feeds SSB exitation back to the 6146s operating in class AB, about 12 watts worth of drive. I have fed its output directly into a dipole on 40M and workied Denver from LA. You could use THEAPACHE as a Linear as well. Its a rather unique and very stable rig. JIM Temporarily expired. BB Soon.