Philips
| Brand on Tube | Philips |
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| Real Tube Manufacturer | Mullard |
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| Country | Great Britain |
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| Etched code on Tube | Xf4 B9G7 |
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| Factory Code | B - Mullard, Blackburn |
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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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| Getter | O-Getter Halo |
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| Getter Support | Double |
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| Plate Look | Stapled |
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| Pin Color | Silver Pins |
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| Base | Black |
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