| 1. | UX6 | 6 pin American | 11. | Sc5 | 5 pin Side contact, European |
| 2. | UX5 | 5 pin American | 12. | IO1-1 | 8 pin International Octal, No. 1. |
| 3. | UX4 | 4 pin American | 13. | IO2-2 | 8 pin International Octal, No. 2. |
| 4. | Br5 | 5 pin British | 14. | B8B, B8G | 8 pin Loctal, International |
| 5. | Br7 | 7 pin British | 15. | B7G-1 | 7 pin Glass, International No. 1. |
| 6. | Mo8 | 8 pin Mazda | 16. | B7G-2 | 7 pin Glass, International No. 2. |
| 7. | B9G | 9 pin glass, British | 17. | B9A | 9 pin miniature glass, International |
| 8. | UX7 | 7 pin American | 18. | B8A | 8 pin Miniature glass, lock-in, European |
| 9. | Tel | 8 pin Telefunken, German | 19. | B8A | |
| 10. | Sc8 | 8 pin Side contact, European | 20. | B3G | 3 pin glass, British |
Valve top cap: