Philips Audio Tubes
(Valvo Amperex Mullard)
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Label Colors |
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| Many "special tubes" (as E83CC or E88CC) were labelled using different printing colors. These tubes have the below mentioned distinctive features. This does not mean that they are automatically better for HiFi or Audio use..... | ||||
| Red Label | Yellow Label | Green Label | Blue Label | |
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These tubes were designed for use in |
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| industrial controlling | long distance transmission | calculators | aviation | |
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They have (at least) the following characteristics |
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long life, high reliability, high tolerances, high shock and vibration resistance, special cathodes |
long life, high reliability, high tolerances, |
long life, high reliability, high tolerances in significant curve points, special cathodes |
high reliability, high tolerances, high shock and vibration resistance, special filaments for switching |
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