[MrFixr55]

This is definitely one of the weirder schematics that I have seen! I can understand using a 50L6 as a rectifier (I have seen that done with Emerson and RCA Lunchboxes with 37 triodes pressed into rectifier duty) but a 50L6 as a local oscillator for the 1st detector? There must have been a fire sale on 50L6s somewhere. I know that there was a war on (Production must have ceased shortly after the line was introduced), but i can think of better uses for 50L6s, like a push pull amp, voltage doubler rectifier (after all, the Phono makes this an AC Only set), etc.

2 things to look at. If your unit has the electrodynamic speaker (the reason for the 50L6 Rectifier), check the phasing of the field coil. I don't see a hum bucking coil in the schematic, but since there is only a 10 uF cap (81) filtering the output, phasing may be an issue. If you are missing C81, that's an issue too.