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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C100A | Triode |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1111 | Pulse Tetrode |   |  | 
 | 715C CV598 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1112 | Pulse Tetrode | 1956 |   | 
 | 4-250A CV2131 QY4-250 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1133 | Pulse Tetrode |   |   | 
 | 4PR60A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1134 | Double Beam Tetrode | 1974 | B7A | 
 | 2B52 55B/200A 6252 6252 AX9910 CV2799 QQE03/20 QQV03-20A SRS4452 TH2J30-34 TT20 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1148 | Pulse Tetrode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1149/1 | Pulse Tetrode | 1963 | B4A | 
 | CV6131 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1150 | Pulse Tetrode |   | B4A | 
 | CV427 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1166 | Pulse Tetrode |   |  | 
 | CV10404 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C1179 | Pulse Tetrode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C144 | Double Beam Tetrode | 1954 | B7A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C178A | Double Beam Tetrode | 1955 |   | 
 | 5894 C178A/5894 CV2797 QQV06-40A SRS4451 TT25 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C178A/5894 | Double Beam Tetrode |   |   | 
 | 5894 C178A CV2797 QQV06-40A SRS4451 TT25 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| C180 | Double Beam Tetrode | 1954 |   | 
 | 832A CV788 QQV04-15 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CA | Soft Triode | 1912 |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAG29 | Photocell |   |   | 
 | 90AG GA50 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAM2 | Triode | 1954 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT14 | Triode | 1957 |   | 
 | VT58 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT17 | Triode | 1957 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT20 | Triode | 1954 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT21 | Triode | 1954 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT22 | Triode | 1954 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT26 | Triode | 1955 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT27 | Triode | 1955 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT29 | Triode | 1955 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT3 | Triode | 1954 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAT9 | Triode |   |  | 
 | CV2872 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAV25 | Photocell |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CAV35 | Photocell |   |   | 
 | VA26T | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CB215S | Double Triode | 1938 | Ct8 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CBL1 | Double Diode Pentode | 1938 | Ct8 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CBL31 | Double Diode Pentode | 1938 | IO | 
 | CV1463 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CCS1 | Power Tetrode |   |   | 
 | 4KC/160M Y-799 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CD12 | Numeric Indicator |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE1 | Photocell |   |   | 
 | 3554 4GSM 50CG 868 CE1 CMG32 G8 GS146 NU.1 PJ23 R59A WL735 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE11 | Photocell |   |   | 
 | GS118TA R59TA | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE11V | Photocell |   |   | 
 | 917 CE11V GL917 NU11V R59TAV VS118TA | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE13 | Photocell |   |   | 
 | GS117ATA NU13 R71TA | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE13V | Photocell |   |   | 
 | NU13V R71TAV VS117ATA | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE1V | Photocell |   |   | 
 | CE1V R59AV VS118 WL734 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE2 | Photocell |   |   | 
 | 4GC 814A GS117A NU2 R71A WL737 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE25 | Photocell |   |   | 
 | 3530 927 CMG34X GL927 GS47X | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE25V | Photocell |   |   | 
 | CMV33X NU25V R51AV VS44X | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE2V | Photocell |   |   | 
 | R71AV VS117A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE30 | Photocell |   |   | 
 | 930 GL930 GS16SO NU30 R61A R64A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE30V | Photocell |   |   | 
 | 925 NU30V R61AV R64AV VS16SO | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE31V | Photocell |   |  | 
 | 9104D | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE36 | Photocell |   |   | 
 | GS44Y NU36 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE36V | Photocell |   |   | 
 | NU36V VS44Y | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE4 | Photocell |   |   | 
 | G12 GS116AM R58A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE4V | Photocell |   |   | 
 | R58AV VS116AM | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CE7 | Photocell |   |   | 
 | GS126A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CG3E |   |   |   | 
 | CV164 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CK512AX | Pentode | 1956 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CL2 | Pentode |   |   | 
 | PP24 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CL30/20P4 | Pentode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CM17 | Photocell |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CM8 | Photocell |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG17 | Photocell |   |   | 
 | 3533 GS17 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG22 | Photocell |   | B4 | 
 | 52CG CMG22 CV248 GS16 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG28 | Photocell |   |   | 
 | GS49 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG29 | Photocell |   |   | 
 | 90CG GS50 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG32 | Photocell |   |   | 
 | 3554 4GSM 50CG 868 CE1 CMG32 G8 GS146 NU.1 PJ23 R59A WL735 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG33 | Photocell |   |   | 
 | GS44 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG33X | Photocell |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG34 | Photocell |   |   | 
 | GS47 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG34X | Photocell |   |   | 
 | 3530 927 CE25 GL927 GS47X | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG7 | Photocell |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG8 | Photocell |   |   | 
 | GS26T | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMG8A | Photocell |   | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMV28 | Photocell |   |   | 
 | VS49 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMV29 | Photocell |   |   | 
 | 90AV VA50 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMV29 | Photocell |   |   | 
 | 90CV VS50 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMV33 | Photocell |   |   | 
 | VS44 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMV33X | Photocell |   |   | 
 | CE25V NU25V R51AV VS44X | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMV34 | Photocell |   |   | 
 | VS47 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CMV34X | Photocell |   |   | 
 | VS47X | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CR1100 | Tetrode (Power) |   |   | 
 | QY5-3000A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CR1101 | Tetrode (Power) |   |   | 
 | 6181 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CR192 | Triode (Power) |   |   | 
 | 6166 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CR192A | Triode (Power) | 1970 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| Crookes-Tube | Crookes Tube |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CS36A |   |   |   | 
 | CV165 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CST1-6000 | Thyratron | 1952 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-08 | Triode | 1925 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-08+ | AF/Output Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-10+ | AF/Output Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-15 | AF/Output Triode | 1925 | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-210HF | Triode | 1929 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-210LF | AF Triode | 1929 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-2132 | Camera Tube |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-215 | RF Tetrode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-215H | RCC Triode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-215P | Output Triode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-215SG | RF Tetrode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-25 | Triode | 1925 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-25B | RF/RCC Triode | 1925 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-2SSD | Gas Filled Detector Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-410HF | Triode | 1929 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-410LF | AF Triode | 1929 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-4SSD | Gas Filled Detector Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-610HF | Triode | 1929 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-610LF | AF Triode | 1929 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CT-6SSD | Gas Filled Detector Triode | 1926 | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CX1159 | Thyratron |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CY10 | Rectifier HW |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CY2 | Rectifier 2 x HW | 1939 | Ct8 | 
 | 13U7 30BG G3060 MCY2 TCY2 UVG51 UY2 VCY2 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CY30/U301 | Rectifier HW |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| CY32 | Rectifier 2 x HW | 1939 |   | 
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