| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A … |  |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |   |  | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |  |  | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |  |  | 
 |   | 
 | 
|  | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A2/DC/S | Concentrated Arc Lamp |   |  | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A2196 | Triode |   |   | 
 | CV3920 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A2244 | Triode |   |   | 
 | CV3921 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A2272 | Rectifier EHT | 1955 |   | 
 | CV2318 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A2637 | Shunt Stabiliser Triode |   | IO | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A2792 | Shunt Stabiliser |   | B9A | 
 | CV6097 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A27D | Double Diode Pentode | 1937 | B7 | 
 | CV519 Pen4DD | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A2900 | Double Triode | 1963 | B9A | 
 | CV6091 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A373 | Diode |   |   | 
 | CV1184 NR62 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A40. | Thermal Delay Switch |   | B4 | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A441 | Bi-Grid |   |   | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A50B | Pentode |   |   | 
 | SP4B | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| A915 | Pentode |   |   | 
 | CV1462 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AB500 | Triode |   |  | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC/DD | Double Diode | 1932 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC/DD4A | Double Diode |   | B5 | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC/HLDDD | Triple Diode Triode | 1934 |   | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC/S2 | Pentode | 1931 |   | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC/TH1A | Triode Heptode | 1938 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC/TP | Triode Pentode | 1934 | B9 | 
 | TP4 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC/VS | Vari-μ tetrode |   | B5 | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC064 | Output Triode | 1930 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC104 | Output Triode | 1930 | B4 | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC2/P | Triode |   |  | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AC2/PenDD | Double Diode Pentode | 1934 | B7 | 
 | DDPP4B DN41 PT4D | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACD | Double Diode | 1936 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACG | GP/Output Triode | 1933 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACHF | RF Triode | 1932 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACHP | RF Pentode | 1934 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACL | AF/Output Triode | 1933 |   | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACP | Output Triode | 1932 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACPN | Output Pentode | 1933 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACPP | Output Triode | 1936 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACS2/Pen | Pentode |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACS4 | Tetrode (Power) |   |   | 
 | CR1100 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACS5 | Tetrode (Power) |   |   | 
 | 4CX5000A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACSG | RF Tetrode | 1932 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT14 | Triode (Power) | 1954 |   | 
 | BR140 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT16 | Triode (Power) | 1959 |   | 
 | BR153 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT17 | Triode (Power) |   |   | 
 | CV225 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT22 | Triode (Power) |   |  | 
 | CV257 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT20 | Triode (Power) |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT24 | Triode (Power) |   |   | 
 | CV240 E1239 E1496 E1860 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT25 | Triode (Power) |   |  | 
 | CV436 E1996 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT27 | Triode (Power) | 1954 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT28 | Triode (Power) | 1958 |   | 
 | CV2163 VX3071 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT30 | Triode (Power) |   |   | 
 | 5762 CV2383 TY6-5000A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT36 | Triode (Power) |   |   | 
 | AT37 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT6 | Triode (Power) |   |  | 
 | AT75 CV1222 CV2825 E472+D3157 NT39 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT70 | Triode (Power) |   |   | 
 | BR1160 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACT9 | Triode (Power) | 1959 |  | 
 | CV28 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACVHP | VM RF Pentode | 1934 |   | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ACVS | VM RF Tetrode | 1933 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AD/P4 | Triode |   |   | 
 | C1198 NR94 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AD1 | Thermal Delay Switch |   |   | 
 | CV1314 DLS10 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ADG | Output Triode | 1934 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ADHF | Triode | 1934 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ADHP | RF Pentode | 1934 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ADL | Output Triode | 1934 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ADPN | Output Pentode | 1933 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ADVHP | VM RF Pentode | 1934 |   | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AF2 | VM Pentode | 1947 |   | 
 | TF2 VAF2 WE25 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AF22-10 | Radar CRT | 1959 |   | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AF31-10 | Radar CRT | 1959 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AF7 | HF Pentode | 1959 | Ct8 | 
 | TF7 VAF7 WE34 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AFN202 |   |   |   | 
 | CV3 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AFX203 | Thyratron (Xenon) | 1954 | UX4 | 
 | CV2868 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AFX212 | Thyratron (Xenon) |   |   | 
 | 6D4 CV1949 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AFX234 | Thyratron (Xenon) |   |   | 
 | CV5023 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AG5209 | Voltage Reference Tube | 1958 |   | 
 | 0G3 QS1209/5651 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AH217 | Rectifier MV |   |   | 
 | 4064B 872 872A CV642 ESU872 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AH221 | Rectifier MV | 1959 |   | 
 | CV5 CV1435 ESU200 GU21 RG4-1250 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AL1 | Pentode | 1959 |   | 
 | CV159 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AL13-36 | Radar CRT | 1957 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| Al22-10 | Radar CRT | 1959 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AL31-10 | Radar CRT | 1959 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AL4 | Output Pentode | 1936 |   | 
 | 4E1 4L4 A4FF4 NLP61 OSW3103 RAL4 TAL4 TL44 UAL4 WE38 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AMG2/25 | General Purpose Triode | 1926 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AMG6/9 | General Purpose Triode | 1926 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AML2/30 | Output Triode | 1926 | B4 | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AML6/25 | Output Triode | 1926 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AMR2/9 | RF/ RCC Triode | 1926 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AMR6/9 | RF/Detector Triode | 1926 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AMS6/100 | Output Triode | 1926 |   | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP1188 | Neon Wattmeter |   |   | 
 | CV264 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP235 | Bi-Grid | 1927 |   | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP406 | Bi-Grid | 1927 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP4100 | Rectifier FW |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP412HF | Bi-Grid | 1927 |   | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP412P | Bi-Grid (Output) | 1927 | B4 | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP412RC | Bi-Grid | 1927 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP412SG | Bi-Grid | 1927 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP412U | Bi-Grid | 1927 |   | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AP425P | Bi-Grid | 1927 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| APNDH | Output Pentode | 1936 |   | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AR10T | Ignitron |   |   | 
 | BK24/5552A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AR14T | Ignitron |   |   | 
 | BK42/5551A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AR3 | Triode |   |  | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AR31 | Ignitron |   |   | 
 | BK66/5550 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| ASG5017 | Thyratron (Mercury Vapour) | 1953 |   | 
 | BT19 CV1144 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AV33 | Control Diode |   | IO | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AV44 | Control Diode | 1960 | IO | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AVC2 | Diode Pentode | 1933 | B4 | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AW13-36 | TV Viewfinder CRT | 1958 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AW17-20 | TV Monitor CRT | 1961 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AW22-10 | TV Monitor CRT | 1957 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AW36-20 | TV CRT | 1957 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AW36-20Z | TV CRT | 1957 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AW36-21 | TV CRT | 1957 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AW36-48 | TV Monitor CRT | 1961 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AW43-48 | TV Monitor CRT | 1961 |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX105 | Thyratron |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX228 | Rectifier (Xenon) | 1960 |   | 
 | CV5 CV2399 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX255 | Thyratron |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX260 | Thyratron |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX4-125A/4D21 | Tetrode (Power) |   |   | 
 | C1108 CV2130 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX4-250A/5D22 | Tetrode (Power) |   |   | 
 | C1112 CV2131 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX9903 | Tetrode (Power) |   |   | 
 | C178A/5894 CV2797 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX9904 | Triode (Power) |   |   | 
 | BW1165 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX9904R | Triode (Power) |   |   | 
 | BR1165 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX9907 |   |   |   | 
 | CW1100 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX9907R |   |   |   | 
 | CR1100 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX9910 | Tetrode (Power) |   |   | 
 | C1134 CV2799 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX9911 | Thyratron (Hydrogen) | 1953 |   | 
 | CV1787 CV5247 FX2505 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AX9912 | Thyratron (Hydrogen) |   |   | 
 | 8503 CV6022 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| AZ32 | Rectifier FW | 1939 |   | 
 | 1868 1RV/120/350 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| Augetron | Electron Multiplier |   |  | 
 |   | 
 |