Amperex
| Brand on Tube | Amperex |
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| Country | Holland |
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| Etched code on Tube | ⊿6I4 |
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| Factory Code | ⊿ - Philips, Heerlen |
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| Year | 1966 |
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| Tip Shape | Pinched Tip |
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| Glass Color | Clear Glass |
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| Mica | Double Mica |
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| Getter | O-Getter Halo |
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| Getter Support | One |
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| Plate Look | Ribbed / Scale |
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| Plate Size | 14mm |
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| Plate Color | Matte Gray |
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| Pin Color | Silver Pins |
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