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RE: UTC 72181 interstage Transformer ID?

A long part number like that would indicate it is an OEM product. IOW it was created for a specific vendor intended as part of their product. The six tabs indicate a single plate to push pull grids. The "F" is for filament so probably a directly heated triode (2A3, 6B4, 6A5) driven by a 27 family triode (27, 37, 56, 76, 6P5, 6J5).

Edits: 02/13/17

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