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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: |  
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D.06HF |  |   |   | 
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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: |  
| D024 | Triode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D030 | Triode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D051 | Triode |   |   | 
 | CV1 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D11F | Pentode | 1945 |   | 
 | D1F | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D12F | Pentode | 1945 |   | 
 | D2F | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D1F | Pentode | 1945 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D296 | Triode |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D2F | Pentode | 1945 |   | 
 | D12F | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D.3 | Triode (HF | 1924 |   | 
 | Det LF Variants) and | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D31 | Photocell |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D37/30 | Rectifier EHT |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D3F | Pentode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D410 | Bi-Grid | 1931 |   | 
 | MD4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D43 | Diode |   | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DA1 | Triode | 1936 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DA2 | Triode | 1936 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DA250 | Triode | 1954 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DA3 | Triode | 1936 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DAC1 | Diode Triode | 1939 | Ct8 | 
 | CV2887 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DAC21 | Diode Triode |   | IO | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DAF70 | Diode Pentode | 1950 |   | 
 | CV2104 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DAF96 | Diode Pentode | 1953 | B7G | 
 | 1AH5 1AM5 1FD1 ZD25 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DC/HL | Triode | 1931 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DC2/P | Output Triode | 1931 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DC80 | Triode |   |   | 
 | CV2172 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD101 | Double Diode | 1938 | MO | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD13 | Double Diode | 1936 | B5 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD207 | Double Diode | 1937 | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD4 | Double Diode | 1934 | B5 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD41 | Double Diode | 1938 | MO | 
 | CV1403 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD4D | Double Diode | 1938 | B7 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD620 | Double Diode | 1934 | B5 | 
 | ZD | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD818 | Double Diode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DDA/13 | Double Diode | 1935 |   | 
 | 2D13C | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DD/Pen | Double Diode Pentode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DDPP4M | Double Diode Pentode |   |   | 
 | CV519 Pen4DD | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DDR100 | Double Diode | 1947 |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DDR2 | Pentode |   |   | 
 | CV173 EF55 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE.06 | Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D.E.34 | Bi-Grid | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| D.E.4 | Bi-Grid | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE | Bi-Grid | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE.34HF | Triode | 1925 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE06 | Bi-Grid | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE06HF | RF Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE06LF | AF Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE2HF | RF Triode | 1925 | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE2LF | LF Triode | 1925 | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE3HF | RF Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DE3LF | AF Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DEH210 | Triode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DEH410 | Triode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DEL210 | Triode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DEM2 | Triode |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DEP410 | Triode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DEP610 | Triode | 1927 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DEQ | Triode | 1923 |  | 
 | CV1156 NR18 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DES1 | Thermal Delay Switch |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DET1SW | Triode |   |   | 
 | 161D CV2895 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DET10 | Triode |   |   | 
 | CV2900 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DET1SW | Triode |   |   | 
 | CV2895 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DET2 | Triode |   |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DET8 | Triode |   |   | 
 | CV2898 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DET9 | Triode |   |   | 
 | CV2899 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DF60 | Pentode |   |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DF61 | Pentode |   |  | 
 | CV2371 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DF62 | Pentode | 1956 |   | 
 | 1AD4 CV2237 XFR1 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DF63 | Pentode | 1958 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DF73 | Pentode | 1950 |   | 
 | CV2103 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DFA0 | Triode | 1924 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DFA2 | Triode | 1924 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DFA5 | Triode | 1926 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DFA6 | Triode | 1926 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DFA7 | Triode | 1926 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DG12C | Indicator |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DG2 | Bi-grid | 1931 |  | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DG210 | Bi-grid | 1931 | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DG407 | Bi-grid | 1932 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DGP3 | Bi-grid | 1925 | B4 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DH109 | Triple Diode Triode |   |   | 
 | 10LD12 UABC80 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DH2 | Double Diode |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DHL | Triode | 1934 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DK40 | Heptode | 1948 |   | 
 | MDK40 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DL-4 | Triode |   |  | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DL-5 | Triode |   |  | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DL-7 | Triode |   |  | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DL-14 | Triode |   |  | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DL-15 | Triode |   |  | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DLS1 | Thermal Delay Switch | 1933 |  | 
 | CV2913 | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DLS15 | Thermal Delay Switch | 1949 | B4 | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DLS16 | Thermal Delay Switch | 1949 | IO | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DM160 | Fluorescent Column | 1957 |  | 
 | CV5412 | 
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| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DN41 | Double Diode Pentode | 1935 |   | 
 | AC2/Pen/DD DDPP4B PT4D | 
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| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DO10 | Output Triode | 1932 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DO20 | Output Triode | 1929 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DO26 | Triode | 1933 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DO75 | Output Triode | 1931 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DP | Output Triode | 1934 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DPT | Pentode | 1931 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DQ2 | Rectifier (MV) | 1938 | UX4 | 
 | 866A | 
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| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DR2000 | Indicator | 1968 |  | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DS103 |   |   |   | 
 | CV94 | 
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| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DS320 | Triode | 1938 |   | 
 |   | 
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| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DS323 | Pulse Triode | 1937 |  | 
 |   | 
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| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DS4100 | Diode Tetrode | 1933 |  | 
 |   | 
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| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DSB | RF Tetrode | 1933 | B5 | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DV55 | Heil Tube |   |   | 
 | CV230 V230C/1D | 
 | 
| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DV-6 | Triode | 1923 |   | 
 |   | 
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| 
| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DV-6A | Triode | 1923 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DVSG | Vari-μ Tetrode | 1934 |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DW7X | Rectifier HW |   |   | 
 |   | 
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| Type | Structure | Date | Base | PDF | Sensibly equivalent¶ to: |  
| DY70 | Rectifier HW |   |   | 
 |   | 
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