| Electron tube Type | Brand | System | Data sheet | 
    | L10 | Schrack | t | T10_Sch.pdf (32673 bytes) (nl) | 
    | L12 | Marconi | t | H12.pdf (83305 bytes) | 
    | L14-111GH/55 | Philips | CRO | L14-111GH-55_1988.pdf (436830 bytes) | 
    | L14-131GH/55 | Philips | CRO | L14-131GH-55_1988.pdf (474331 bytes) | 
    | L14-140GH/95 | Philips | CRO | L14-140GH-95_1988.pdf (502669 bytes) | 
    | L14-150GH/95 | Philips | CRO | L14-150GH-95_1988.pdf (440890 bytes) | 
    | L2 | Mazda | t | HL2.pdf (106165 bytes) | 
    | L2001 (= 7686) | LittonIndustries |  | 7686.pdf (102651 bytes) | 
    | L21 | Osram | t | HL2.pdf (133581 bytes) | 
    | L21DD | Mazda | ddt | HL21DD.pdf (120729 bytes) | 
    | L22DD | Mazda | ddt | L22DD.pdf (105037 bytes) | 
    | L2B | Marconi | t | HL210.pdf (78928 bytes) | 
    | L30 | Osram | t | H30.pdf (119435 bytes) | 
    | L3000 (= 6J21) | Litton |  | 6J21.pdf (77579 bytes) | 
    | L3000A (= 5607) | Litton |  | 5607.pdf (79901 bytes) | 
    | L3023 (= 6233) | Litton |  | 6233.pdf (130106 bytes) | 
    | L4050 (= 8123) | WesternElectric |  | 8123.pdf (123061 bytes) | 
    | L410 | Marconi | t | L410.pdf (75825 bytes) | 
    | L610 | Marconi | t | L610.pdf (145491 bytes) | 
    | L63 | Marconi | t | L63.pdf (94477 bytes) | 
    | L63 | Marconi | t | H63.pdf (78865 bytes) | 
    | L77 | Marconi | t | L77.pdf (230994 bytes) | 
    | LA16-2 | Mullard | FWA | LA16-2.pdf (182453 bytes) | 
    | LA16-2 (= 7639) | Mullard | FWA | 7639.pdf (90551 bytes) | 
    | LA16-2C | Mullard | FWA | LA16-2C.pdf (199898 bytes) | 
    | LA4-250 (= 7637) | Mullard |  | 7637.pdf (87206 bytes) | 
    | LA74 | Loewe | t | AR23_Loe.pdf (33362 bytes) (nl) | 
    | LA75 | Loewe | t | AR23_Loe.pdf (33362 bytes) (nl) | 
    | LA77 | Loewe | t | AR23_Loe.pdf (33362 bytes) (nl) | 
    | LA9-3 | Mullard | FWA | LA9-3.pdf (190865 bytes) | 
    | LA9-3 (= 7638) | Mullard | FWA | 7638.pdf (88142 bytes) | 
    | LA9-3B | Mullard | FWA | LA9-3B.pdf (192306 bytes) | 
    | LA9-3B | Mullard | FWA | LA9-3B.pdf (451904 bytes) | 
    | LB1 | Wehrmacht Röhren | CRO | LB1.pdf (165113 bytes) (de) | 
    | LB13/40 | Wehrmacht Röhren | CRR | LB13-40.pdf (165628 bytes) (de) | 
    | LB13/41 | Wehrmacht Röhren | CRR | LB13-40.pdf (165628 bytes) (de) | 
    | LB2 | Wehrmacht Röhren | CRR | LB2.pdf (146600 bytes) (de) | 
    | LB20 | Wehrmacht Röhren | CRR | LB20.pdf (149541 bytes) (de) | 
    | LB6 | Wehrmacht Röhren | CRO | LB6.pdf (54196 bytes) (de) | 
    | LB7/15 | Wehrmacht Röhren | CRO | LB7-15.pdf (158788 bytes) (de) | 
    | LB8 | Wehrmacht Röhren | CRO | LB8.pdf (293640 bytes) (de) | 
    | LCF80 | RCA (RC30) | tp | 6LC8.pdf (728202 bytes) | 
    | LCF801 | RCA (RC30) | tp | 6GB5.pdf (411522 bytes) | 
    | LCF802 | RCA (RC30) | tp | 6JU8A.pdf (328029 bytes) | 
    | LCF86 | Sylvania | tp | 6HG8.pdf (131935 bytes) | 
    | LCF86 | RCA (RC30) | tp | 6GW8.pdf (819702 bytes) | 
    | LCL84 | RCA (RC30) | tP | 6DX8.pdf (128198 bytes) | 
    | LCL85 | RCA (RC30) | tP | 6GV8.pdf (130530 bytes) | 
    | LD1 | Wehrmacht Röhren | t~ | LD1.pdf (310025 bytes) (de) | 
    | LD15 | Wehrmacht Röhren | T~ | LD15.pdf (78485 bytes) (de) | 
    | LD2 | Wehrmacht Röhren | T~ | LD2.pdf (226495 bytes) (de) | 
    | LD5 | Wehrmacht Röhren | T~ | LD5.pdf (220384 bytes) (de) | 
    | LD550A | NEC | TWT | LD550A.pdf (982206 bytes) | 
    | LD550B | NEC | TWT | LD550B.pdf (3870365 bytes) | 
    | LD570 | NEC | TWT | LD570.pdf (1351001 bytes) | 
    | LD571 | NEC | TWT | LD571.pdf (1289354 bytes) | 
    | LD590 | NEC | TWT | LD590.pdf (1891726 bytes) | 
    | LD597A | NEC | TWT | LD597A.pdf (3603291 bytes) | 
    | LD605 | NEC | TWT | LD605.pdf (4484204 bytes) | 
    | LD637 | NEC | TWT | LD637.pdf (3767506 bytes) | 
    | LD7 | Wehrmacht Röhren | T~ | LD7.pdf (382598 bytes) (de) | 
    | LD9 | Wehrmacht Röhren | T~ | LD9.pdf (277620 bytes) (de) | 
    | LF183 | RCA (RC30) | p | 6EA8.pdf (574278 bytes) | 
    | LF184 | RCA (RC30) | p | 6EA8.pdf (574278 bytes) | 
    | LG1 | Wehrmacht Röhren | dd | LG1.pdf (161502 bytes) (de) | 
    | LG10 | Wehrmacht Röhren | RR | LG10.pdf (111154 bytes) (de) | 
    | LG1000 | Wehrmacht Röhren | TBD | LG1000.pdf (303636 bytes) (de) | 
    | LG1001 | Wehrmacht Röhren | TBD | LG1001.pdf (300570 bytes) (de) | 
    | LG12 | Wehrmacht Röhren | RR | LG12.pdf (137033 bytes) (de) | 
    | LG14 | Wehrmacht Röhren | d | LG14.pdf (123249 bytes) (de) | 
    | LG2 | Wehrmacht Röhren | RR | LG2.pdf (122052 bytes) (de) | 
    | LG200 | Wehrmacht Röhren | TBD | LG200.pdf (166655 bytes) (de) | 
    | LG201 | Wehrmacht Röhren | TBD | LG201.pdf (110196 bytes) (de) | 
    | LG3 | Wehrmacht Röhren | R | LG3.pdf (131329 bytes) (de) | 
    | LG4 | Wehrmacht Röhren | RR | LG4.pdf (161286 bytes) (de) | 
    | LG6 | Wehrmacht Röhren | rr | LG6.pdf (179207 bytes) (de) | 
    | LG7 | Wehrmacht Röhren | dd | LG7.pdf (162570 bytes) (de) | 
    | LG71 | Wehrmacht Röhren | TRT | LG71.pdf (43151 bytes) (de) | 
    | LG75 | Wehrmacht Röhren | TBD | LG75.pdf (45809 bytes) (de) | 
    | LG76 | Wehrmacht Röhren | TBD | LG76.pdf (39027 bytes) (de) | 
    | LG998 | Wehrmacht Röhren | TBD | LG998.pdf (33837 bytes) (de) | 
    | LK121 | Wehrmacht Röhren | v`° | LK121.pdf (176723 bytes) (de) | 
    | LL500 | RCA (RC30) | P | 6GB5.pdf (411522 bytes) | 
    | LL86 | RCA (RC30) | P | 6CS6.pdf (457275 bytes) | 
    | LM21 | Lamina | MAG | LM21.pdf (391589 bytes) (pl) | 
    | LM22 | Lamina | MAG | LM21.pdf (391589 bytes) (pl) | 
    | LM4 | Lamina | MAG | LM4.pdf (474615 bytes) (pl) | 
    | LM401 | Lamina | MAG | LM401.pdf (569670 bytes) (pl) | 
    | LM402 | Lamina | MAG | LM401.pdf (569670 bytes) (pl) | 
    | LM504/4 (= RD2Me) | Wehrmacht Röhren | CRO | RD2Me.pdf (36565 bytes) (de) | 
    | LN309 | Marconi | tP | LN309.pdf (657039 bytes) | 
    | LO729   729 | Soviet | CRO | LO729.pdf (214210 bytes) | 
    | LOU2C/316H (= 7785) | HughesAircraftCo |  | 7785.pdf (65978 bytes) | 
    | LP2   | Marconi | T | LP2.pdf (73166 bytes) | 
    | LP2 | Osram | T | LP2.pdf (110275 bytes) | 
    | LP2   | Marconi | T | HL2.pdf (91658 bytes) | 
    | LPT44 (= MLLPT44) | Machlett Laboratories | T~ | LPT44.pdf (403649 bytes) | 
    | LPT45 (= MLLPT45) | Machlett Laboratories | T~ | LPT45.pdf (592544 bytes) | 
    | LPT45H (= MLLPT45H) | Machlett Laboratories | T~ | LPT45.pdf (592544 bytes) | 
    | LPT50 (= MLLPT50) | Machlett Laboratories | T~ | LPT50.pdf (427996 bytes) | 
    | LPT60 (= MLLPT60) | Machlett Laboratories | T~ | LPT60.pdf (274593 bytes) | 
    | LPT62 (= MLLPT62) | Machlett Laboratories | T~ | 7715.pdf (562524 bytes) | 
    | LS1 | Wehrmacht Röhren | p~ | LS1.pdf (162354 bytes) (de) | 
    | LS1000 | Wehrmacht Röhren | T | LS1000.pdf (182764 bytes) (de) | 
    | LS1500 | Wehrmacht Röhren | T~ | LS1500.pdf (494371 bytes) (de) | 
    | LS180 | Wehrmacht Röhren | T~ | LS180.pdf (137923 bytes) (de) | 
    | LS2 | Wehrmacht Röhren | TT | LS2.pdf (154237 bytes) (de) | 
    | LS3 | Wehrmacht Röhren | dt | LS3.pdf (140849 bytes) (de) | 
    | LS30 | Wehrmacht Röhren | T~ | LS30.pdf (194108 bytes) (de) | 
    | LS300 | Wehrmacht Röhren | T | LS300.pdf (151569 bytes) (de) | 
    | LS4 | Wehrmacht Röhren | P | LS4.pdf (723583 bytes) (de) | 
    | LS50 | Wehrmacht Röhren | P~ | LS50.pdf (748812 bytes) (de) | 
    | LS52 | Wehrmacht Röhren | P~ | LS52.pdf (106178 bytes) (de) | 
    | LS5A | Marconi | T | LS5A.pdf (72510 bytes) | 
    | LS6A | Marconi | T | LS6A.pdf (61699 bytes) | 
    | LSD2 | Mullard | FLT | LSD2.pdf (76874 bytes) | 
    | LSS | Schrack | t | T10_Sch.pdf (32673 bytes) (nl) | 
    | LV1 | Wehrmacht Röhren | P | LV1.pdf (386806 bytes) (de) | 
    | LV13 | Wehrmacht Röhren | T | LV13.pdf (373567 bytes) (de) | 
    | LV3 | Wehrmacht Röhren | P | LV3.pdf (394384 bytes) (de) | 
    | LV3 | RFT | P | LV3.pdf (120521 bytes) (de) | 
    | LV3 | Schrack | t | T10_Sch.pdf (32673 bytes) (nl) | 
    | LV4 | Wehrmacht Röhren | PP | LV4.pdf (414122 bytes) (de) | 
    | LV5 | Wehrmacht Röhren | p | LV5.pdf (128582 bytes) (de) | 
    | LY88 (= 20AQ3) | RCA (RC30) | R | 16A8.pdf (180977 bytes) | 
    | LZ319 | Marconi | tp | LZ319.pdf (273005 bytes) |