Marconi
| Brand on Tube | Marconi |
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| Real Tube Manufacturer | Mullard |
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| Country | Great Britain |
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| Etched code on Tube | f92 B91 |
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| Factory Code | B - Mullard, Blackburn |
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| Year | 1959 |
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| Tip Shape | Pinched Tip |
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| Glass Color | Clear Glass |
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| Plate Look | Ribbed / Scale |
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| Plate Size | 17mm |
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| Plate Color | Matte Gray |
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