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European Tube Boxes |
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| This the B.T.H. (British Thompson-Houston) type B5 tube with its box, from the mid-1920's. Electrically, this tube was very similar to the US type 199 tube. |
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European Tube Boxes |
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| This the B.T.H. (British Thompson-Houston) type B5 tube with its box, from the mid-1920's. Electrically, this tube was very similar to the US type 199 tube. |
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