sonora: transformer information

I'm hoping someone can share some information on the small transformer going to the cathode of the 25Z5.  As best I can tell, the one in my set is missing.  What did it look like and what was the value?

Best regards,

Donald

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Although it is drawn as a transformer in the schematic, it is in fact the loudspeaker's field winding. So it does not exist as a separate physical component.

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Thank you very very much.  The help is greatly appreciated.

Best regards,

Donald

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