I am with the California Historical Radio Society in Alameda, CA. We are in the process of restoring TBY transceivers for a hands-on working display. The mic/headphone connector called out in the manual is an MC-4F1 made by American Phenolic. Are any of these kicking around out there?
Do you know if the currently available 91-MC-4F1 will fit?
BTW, we successfully repaired the carbon mic by replacing the old carbon granules with those from a newer carbon mic element. Now we need to locate one more mic and headset.
Dennis AE6C