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Try this number(NNN) NNN-NNNN They have antique schematics although they dont list this one on their website, perhaps they can guide you. http://antiqueradioschematics.org/?gclid=CL22uPj6pbACFeNxOgodexyPZQ
He did not have info I needed & no ideas.
You can try downloading the next article and see if they have a contact number perhaps they can help you