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Dunno if it's of any help, but RCA's patent for their version includes a schematic of a tube-based FM Stereo Multiplex adapter. Might be similar. Patent number is 3171897. The same patent mentions an Electronics World magazine article from June of 1962 entitled "Signal Generators for FM Multiplex." I don't have that issue, but it is available on eBay from several sellers. Might be germane to your generator.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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