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RE: The story of 6AS7G "Coke Bottle"?

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The tube was made in the US by RCA and the Chatham-labeled tubes seem to be the same thing. Westinghouse made their own version as did Sylvania. There was a Tung-Sol variety too- that had better specs (better linearity) than the RCA. For that matter, the Westinghouse and Sylvania seem to be more linear too.

Western Electric made a version of the tube called the 421A, and TungSol had a variant called the 5998 that was very similar...





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