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24.18.149.164
Did the Google search and came up empty. This is a 12BH7A tube...
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Hi, popsy. B & K probably Bruel & Kjaer Sound and Vibration instrumentation. The tubes were not manufactured by them but labeled
for them. Is there any other 'code' on the tube: numbers, letters,
symbols? These might help answer your question.
Looked for codes and they all say 274 which is RCA except one that is 312 and Sylvania..date codes of 1958..so that's pretty cool :)
As Stan Laurel once said, "Life isn't short enough."
Don't sweat the small stuff.
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