Mullard
| Brand on Tube | Mullard |
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| Etched code on Tube | fX1 B7K |
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| Factory Code | B - Mullard, Blackburn |
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| Year | 1957 |
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| Bottle Height | Short |
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| Tip Shape | Round Tip |
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| Glass Color | Clear Glass |
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| Mica | Double |
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| Plate Color | Matte Gray |
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| Pin Color | Silver Pins |
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| Base | Brown |
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