| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |   |  | 
 | WE-203A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-2 |  |   |   | 
 | WE-205B | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-3 |  |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-4A |  |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-4B |  |   |   | 
 | 211 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |   |  | 
 | 211 4C21 CV2576 JAN | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-5 |  |   |   | 
 | 215A 4215a WE-215A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-6 |  |   |   | 
 | 212A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-7 |  |   |   | 
 | WX-12 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-8 |  |   |   | 
 | UV-204 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-10 |  |   |   | 
 |   | 
 | 
| 
| 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: |  
|  |  |   |  | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |   |  | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |   |  | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-17 | Power Tetrode |   |   | 
 | 860 CV640 GC860 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-18 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-19 |  |   |   | 
 | 861 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-20 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |   |  | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-22 |  |   |   | 
 | 204A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-23 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |   |  | 
 | 864 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-25 |  |   |   | 
 | 10 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-25A |   |   |   | 
 |  Special 10 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-26 |  |   |   | 
 | 22 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-27 |  |   |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-28 |  |   |   | 
 | 24 24A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-29 |  |  |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-30 |   |   |   | 
 | 01A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-31 |  |   |   | 
 | 101D 31 4101D CV1638 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-32 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |  |  | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-34 |  |   |   | 
 | 207 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-35 |  |   |   | 
 | 35 35/51 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-36 |   |  |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-37 |  |  |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-38 |  |   |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-39 |  |   |   | 
 | 869 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-39A |   |   |   | 
 | 869A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-40 |  |   |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-41 |  |   |   | 
 | 851 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-42 |  |   |   | 
 | 872 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
|  |  |   |  | 
 | 872 Special | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-43 |  |  |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-44 |  |  |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-45 |  |  |   | 
 |  | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-46 |  |   |   | 
 |  | 
 | 
|  | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-47 | Pentode |   |   | 
 | 47 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-49 |   |   |   | 
 | 39 44 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-50 | Triode |   |   | 
 | 50 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-51 | Triode |   |   | 
 | 841 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-52 | Triode | 1936 |   | 
 | 45spec CV596 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-53 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-54 | Pentode |   |   | 
 | 34 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-55 | Pentode |   |   | 
 | 865 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-56 | Triode | 1932 |   | 
 | 56 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-57 | Pentode |   |   | 
 | 57 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-62 | Triode |   |   | 
 | 801 801A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-63 | Triode | 1936 |   | 
 | 46 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-64 | Triode |   |   | 
 | 800 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-65A | Triode |   |   | 
 | 6C5G | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-67 | Triode |   |   | 
 |  Special 30 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-68 | Double Diode Pentode |   |   | 
 | 6B7 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-70 | Triode Pentode | 1940 |   | 
 | 6F7 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-72 | Triode |   |   | 
 | 842 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-73 |   |   |   | 
 | 843 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-76 | Triode | 1933 |   | 
 | 76 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-89 | Pentode |   |   | 
 | 89 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-90 | Double Diode | 1936 | IO | 
 | 6H6 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-93 | Double Diode Pentode | 1937 | IO | 
 | 6B8 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-93A | Double Diode Pentode | 1937 |   | 
 | 6B8G | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-94B | Triode |   |   | 
 |  Special 6J5 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-94C | Triode |   |   | 
 |  Special 6J5G | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-96 | Double Triode | 1936 | IO | 
 | 6N7 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-96B | Double Triode |   |   | 
 |  Special 6N7 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-99 | Double Triode |   |   | 
 | 6F8G | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-101 |   |   |   | 
 | 837 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-102 |   |   |   | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-105 | Double Triode | 1938 | IO | 
 | 6SC7 CV1969 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-106 | Pentode |   |   | 
 | 803 CV623 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-108 | Triode |   |   | 
 | 450TH | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-116B | Pentode |   |   | 
 | 6SJ7Y | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-118 | Double Beam Tetrode |   | B7A | 
 | 832 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-120 | Pentode |   |   | 
 | 954 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-122 | Triode |   |   | 
 | 530 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-123 | Triode |   |   | 
 | 3-5586 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-124 | Pentode |   |   | 
 | 1A5GT | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-125 | Pentode |   |   | 
 | 1C5GT | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-127 | Triode |   |   | 
 | 100TS | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-127A | Triode |   |  | 
 |  Special 100TS 3-100D2 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-129 | Triode |   |   | 
 | 304TL | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-130 | Triode |   |   | 
 | 250TL | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-135A | Triode |   |   | 
 | 12J5 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-140 | Triode |   |   | 
 | 1628 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-141 | Rectifier FW |   |   | 
 | 531 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-142 | Triode |   |   | 
 | WE-390Yl | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-143 | Triode |   |   | 
 | 805 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-148 | Diode Triode Pentode | 1941 |   | 
 | 1D8GT CV1811 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-149 |   |   |   | 
 | 3A8GT | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-151 | Heptode |   |   | 
 | 6A8G | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-151B | Heptode |   |   | 
 | 6A8GT | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-152A | Pentode |   |   | 
 | 6K6G | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-153 | Double Diode Pentode | 1939 | IO | 
 | 12C8 Special | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-154 | Pentode |   |   | 
 | 814 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-155 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-156 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-157 |   |   |   | 
 |   | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-159 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-160 |   |   |   | 
 |   | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-163 | Double Triode | 1937 |   | 
 | 6C8G | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-164 | Pentode |   |   | 
 | 1619 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-165 | Beam Tetrode |   |   | 
 | 1624 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-168A | Pentode |   |   | 
 | 6Y6G | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-169 | Double Diode Pentode | 1939 |   | 
 | 12C8 CV531 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-170 | Pentode |   |   | 
 | 1E5-Gp | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-171A | Heptode |   |   | 
 | 1R5 Loctal | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-172 | Diode Pentode |   | B7G | 
 | 1S5 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-180 | Beam Tetrode |   |   | 
 | 3LF4 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-182 | Double Triode | 1949 |   | 
 | 1291 3B7 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-183 | Diode |   |   | 
 | 1294 1R4 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-186 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-187 | Rectifier HW |   |   | 
 | 575A | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-189 | Hi-mu Double Triode | 1940 |   | 
 | 7F7 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-192 | Triode |   |   | 
 | 7A4 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-193 | Pentode |   |   | 
 | 6W7G 7C7 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-194 | Heptode |   |   | 
 | 7J7 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-196 | Rectifier FW |   |   | 
 | 6W5G | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-199 | Pentode |   |   | 
 | 6SS7 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-210 | Pentode |   |   | 
 | 1S4 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-212 | Pentode | 1933 |   | 
 | 958 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-213A | Triode |   |   | 
 | 6L5G 6L5 | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-219 |   |   |   | 
 |   | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-220 | Triode |   |   | 
 | 250TH | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-224 | Double Triode |   |   | 
 | 2C34 RK-34 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-225 | Pentode |   |   | 
 | 307A | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-227 | Pentode |   |   | 
 | 7184 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-229 | Double Triode |   | IO | 
 | 6SL7GT | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-230 | Beam Tetrode |   |   | 
 | 35QA | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-234 | Triode |   |   | 
 | HY-114B | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-235 | Triode |   |   | 
 | CV3506 HY615 HY615 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-237 | Pentode |   |   | 
 | 957 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-240 | Triode |   |   | 
 | 710A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-241 | Triode |   |   | 
 | 1201 7E5 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-243 | Diode |   |   | 
 | 1203A 7C4 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-246 | Photocell |   |   | 
 | 918 | 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-249 | Rectifier FW |   |   | 
 | 1006 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-251 | Photocell |   |   | 
 | 441 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-252 | Photocell |   |   | 
 | 923 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-254 | Triode |   |   | 
 | 304TH | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-256 | Magnetron |   |   | 
 | ZP486 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-257 | Magnetron |   |   | 
 | K-7 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-259 | Double Beam Tetrode |   |   | 
 | 829 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-264 | Pentode |   |   | 
 | 3Q4 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-267 | Rectifier HW |   |   | 
 | 578 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-268 | Double Triode |   |   | 
 | 12SC7 | 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-277 | Reflex Klystron |   |   | 
 | 417A CV2642 WL-417A | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-279 |   |   |   | 
 | D161831 GY-2 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-280 | Photocell |   |   | 
 | C7063 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-281 | Pentode |   |   | 
 | HY-145ZT | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-282 | Thyratron |   |   | 
 | ZG489 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-283 | Pentode |   |   | 
 | QF-206 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-284 | Diode |   |   | 
 | QF-197 | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-285 | Triode |   |   | 
 | QF-200C | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-286 | Double Beam Tetrode |   |   | 
 | 832A | 
 | 
| 
 | 
| 
 | 
| 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| VT-360 | GM Tube |   |   | 
 | CV2886 M2H | 
 |