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They ran the 117Z6 filament directly to an AC plug. This tube is dated 1949 but the type appears to have been introduced in 1940.
So, it's entirely possible the modification was made during the war and I have a later replacement tube installed.
What's also odd in the set is the wiring used for some of the mods. Some is solid 14 gauge house wiring, some stranded. Sometimes several lengths of different types spliced together. That leads me to believe someone was using whatever they had lying around.
If it was an RCA employee, I would think they'd have access to better quality parts.
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