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Yup, the SP-1A is the "real" deal, but tremendously more difficult to install.  Got one years ago, (probably 1998 timeframe?) from John Mahoney at Panther Electronics in Nashua, NH (now defunct) and installed it in my Midland 79-290.  I'll tell ya what, that thing, with the SP-1A and dual 1969 finals, and decent heatsinking would do all of 50W SSB PEP all day long and had a 'presence' on SSB (at least to the locals.)  Had to do a LOT of work with the mic jack wiring however in order to get the SP-1A to function properly in that rig.  Still not so sure if the 'juice was worth the squeeze' or not.