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RE: Silvertone 6SN7 Question ?

One of these codes will likely identify the manufacturer.

188 General Electric
274 RCA
312 Sylvania
322 Tung-Sol
280 Raytheon
247 National Union
337 Westinghouse

Your interest may vary but the results are the same (Byrd 2020)

I can't compete with the dead. (Buck W. 2010)

Cowards can't be heroes. (Byrd 2017)

Edits: 05/01/20

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