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Songbird X-171A- made by who???

Greetings- I just received what was supposed to be an RCA UX-171-A in it's original box.Upon opening the Radiotron Red and Blue box and unrolling the corrugated cardboard packing away, the tube inside is an engraved globe "Songbird X-171 A" that looks like NOS and luckily tests like one as well.So the question is; who made this "Songbird" tube? Contruction looks similar to other RCA 171As that I have. Any idea? Thank You, wpod


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Topic - Songbird X-171A- made by who??? - wpod 13:56:02 10/9/07 (3)

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