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Yes, these are interstage audio coupling transformers. Typical use would be one transformer between the gridleak detector and first audio stage, and another between the first audio stage and the audio output stage. Since the simple triode tubes of the era (01As 199s and the like) had pretty low gain, the transformers "step up" ratio actually was used to boost the signal between each audio stage. A 3:1 ratio was common, but other ratios were used as well.
What are the tubes in your set?
jr
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