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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| Q/U37A |  |   |   | 
 | CV4061 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QA2400 |  |  |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QA2401 |  |  |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QA2402 |  |  |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QA2405 | Double Tetrode | 1953 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QB4/1100 | Power Tetrode | 1960 |  | 
 | 7527 YL1460 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QD77 | Double Diode |   | B7G | 
 | EB91 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QEL1/150 | Pentode | 1963 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QEL2/250 | Pentode | 1960 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QEP20/18 | Pentode | 1957 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QP22a | Double Output Pentode | 1935 |   | 
 | 240QP K77A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QP240 | Double Pentode | 1934 | B9 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQC04/15 | Double Beam Tetrode | 1954 | B8B | 
 | 5895 AX9905 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQE02/5 | Double Beam Tetrode | 1957 |   | 
 | 6939 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQE03-20 | Double Beam Tetrode | 1957 | B7A | 
 | 11E15 AX9910 RS1019 SRS4452 TT20 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQE06-40 | Double Beam Tetrode | 1957 | B7A | 
 | 11E16 5894 829 AX9903 RS1009 SRS4451 TD25 TT25 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQV03-25 | Double Beam Tetrode | 1964 | B7A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQV04-15 | Double Beam Tetrode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQV04-16 | Double Beam Tetrode | 1961 |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQV06-40 | Double Beam Tetrode |   | B7A | 
 | CV424 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQV06-40A | Double Beam Tetrode |   | B7A | 
 | 55B/400A 5894/C178A 5894A 5894 CV2797 TT25 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQZ04-15 | Double Beam Tetrode | 1964 |  | 
 | CV1838 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QQZ06-40 | Double Beam Tetrode | 1964 | B7A | 
 | YL1030 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QR132 | Quartz Crystal |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QRS-Red-Top | Triode | 1927 |   | 
 | 201A | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QT1257 | Touch Button | 1970 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QU37 | Rectifier EHT | 1952 |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QU37A | Rectifier EHT | 1952 |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QU452 | Rectifier HW |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QU456 | Rectifier HW |   |   | 
 | CV4117 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QV12-P10 |   | 1960 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QV04-20 | Double Beam Tetrode |   |   | 
 | 815 QQV04-20 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QV07-40 | Double Beam Tetrode |   |   | 
 | QQV07-40 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QV08-100 | Power Tetrode | 1960 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QV20-P18 | Power Tetrode | 1955 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QX1020G | Plumbicon Camera Tube |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QV1-150 | Beam Tetrode |   |   | 
 | 4X150G CV3893 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QVA39 | Photocell | 1951 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QY4-250 | Power Tetrode | 1956 | B5F | 
 | 4-250A 6156 C1112 CV2131 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QY4-400 | Power Tetrode | 1960 |   | 
 | CV5959 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QY4-500A | Power Tetrode | 1963 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QY5-3000A | Power Tetrode | 1957 |   | 
 | CR1100 CV5219 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QY5-3000W | Power Tetrode | 1957 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QY5-500 | Power Tetrode | 1961 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QY4-800 | Power Tetrode | 1962 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| QYS50-P40 | Pulse Tetrode | 1959 |   | 
 | CV313 | 
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