I have the Singer badged version sold in the US... the power cord simply exits through 2 holes in the back instead of the two pins. Perhaps the plug was broken earlier and drilled out, or perhaps that was the factory configuration, I don't know. Mine has the optional UHF tuner (model TV 6U). Old thread here:
http://www.videokarma.org/showthread...ghlight=singer
jr
PS; I haver never seen a schematic for the set, but it is listed as Sams 806-4.