Used in a variety of 1950s and '60s Gates broadcast audio product. my understanding is these models with the "A" suffix (5125A) only used 6267/EF86 tubes, not the early 5879 versions. no tubes present.

the usual p/n 10426 and 10427 input and output transformers are present. AFAIK Gates had these made to spec by Foster, United, and maybe Stancor.

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Thanks for looking!