RCA model 400 Junior (1345-C) 16mm projector amplifier schematic.

[Mark Gulbrandsen]

Not to rain on anyone's parade, there was a reason we called these designs AC/DC death traps.

Ditto for portable TV's and table radios! Then there were old homes and buildings that did not yet have polarized outlets. So did they change the outlet or the plug on the device? Of course Uncle Bob came over and replaced the plug because it was easier and cheaper. He unknowingly created a death trap by doing so.