I am trying to locate a schematic for an old (possibly pre-WWII) Executone intercom. I am unable to find a model number but the tube lineup is 35Z5, 12SJ7, 50L6. The cabinet is wood and the Amplifer sits atop a line selector switch which contains the ring tone buzzer and pushbutton switches to select between 11 lines.
Do you have an archive of these early units or, if not, could you suggest anyone I could contact who might?
thank you
George Gauld
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