Receiving and amplifying tubes and their Soviet analogues
1. Diode detector
2. Kenotron
3. High-voltage kenotron
4. Damper diode
5. Triode
6. Diode-Triode
7. Double Triode (symmetrical)
8. Double Triode (unsymmetrical)
9. Sharp-cutoff pentode (low-frequency)
10. Sharp-cutoff pentode (high-frequency)
11. Remote-cutoff pentode (low-frequency)
12. Remote-cutoff pentode (high-frequency)
13. Output pentode and Beam tetrode
14. Diode-Pentode
15. Triode-Pentode (sharp-cutoff pentode)
16. Triode-Pentode (remote-cutoff pentode)
17. Triode-Pentode (output stage)
18. Double Pentode
19. Hexode, Heptode, Octode
20. Combined triode-heptode
21. Tuning indicator
22. Nuvistor
23. Voltage regulator
24. Thyratron