| KyteLabs InfoBase - Electron Tubes & Valves Data | Last modified: 2005-02-05 (14339) |
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| Bab | 58 | Bernard B. Babani, International Radio Tube Encyclopædia, 3rd Edition 1958 |
| Mik | 60 | Pjotr Mikolajczyk, Universal Vade-Mecum Electronic Tubes and Semiconductor Elements, Edition 1960 |
| Mul | 55 | Mullard Data Sheet 1955 |
| Rvd | 54 | Radio Valve Data, Characteristics of 2,000 Valves and Cathode-Ray Tubes, Compiled by the Staff of 'Wireless World', Fourth Edition 1954 |
| Mullard | [1960] | Mullard Electronic Products Limited, Century House, Shaftesbury Avenue, London, W.C.2, England |
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