| Electron tube Type | Brand | System | Data sheet | 
    | N1010A | EEV | BWO | N1010A.pdf (491801 bytes) | 
    | N1010S | EEV | BWO | N1010A.pdf (491801 bytes) | 
    | N1034A | EEV | BWO | N1034A.pdf (543616 bytes) | 
    | N1034S | EEV | BWO | N1034A.pdf (543616 bytes) | 
    | N1047M | EEV | TWT | N1047M.pdf (273919 bytes) | 
    | N108 | Marconi | P | N108.pdf (781914 bytes) | 
    | N17 | Marconi | P | N17.pdf (111305 bytes) | 
    | N18 | Marconi | P | N18.pdf (195339 bytes) | 
    | N19 | Marconi | P | N18.pdf (195339 bytes) | 
    | N309 | Marconi | P | N309.pdf (508658 bytes) | 
    | N30G | Osram | P | N30G.pdf (125669 bytes) | 
    | N31 | Osram | P | N31.pdf (122697 bytes) | 
    | N329 | Marconi | P | N329.pdf (303929 bytes) | 
    | N339 | Marconi | P | N339.pdf (377100 bytes) | 
    | N37 | Marconi | P | N37.pdf (757136 bytes) | 
    | N41 | Osram | P | N41.pdf (113781 bytes) | 
    | N42 | Osram | P | N42.pdf (105011 bytes) | 
    | N43 | Osram | P | N43.pdf (91273 bytes) | 
    | N709 | Marconi | P | N709.pdf (405739 bytes) | 
    | N727 | Marconi | P | N727.pdf (221150 bytes) | 
    | N77 | Marconi | P | N77.pdf (445484 bytes) | 
    | N78 | GEC | P | N78_GEC.pdf (3810406 bytes) | 
    | N78 | Marconi | P | N78.pdf (495208 bytes) | 
    | ND4 | Wehrmacht Röhren | T~ | ND4.pdf (111161 bytes) (de) | 
    | NE5 | Mazda | NET | NE5.pdf (32264 bytes) | 
    | NE5 | Mazda | NET | NE5.pdf (28258 bytes) | 
    | NF2 | Wehrmacht Röhren | p | NF2.pdf (103142 bytes) (de) | 
    | NF2 (= CF7)   | Philips | p | CF7.pdf (163820 bytes) (de) | 
    | NF3 | Wehrmacht Röhren | p | NF3.pdf (107270 bytes) (de) | 
    | NF4 | Wehrmacht Röhren | p | NF4.pdf (106762 bytes) (de) | 
    | NF40 | Ferranti | TRT | NF40.pdf (74103 bytes) | 
    | NF41 | Ferranti | TRT | NF41.pdf (73089 bytes) | 
    | NL1001 | National Electronics | IGN | NL1001.pdf (493543 bytes) | 
    | NL1005 | National Electronics | IGN | NL1005.pdf (367118 bytes) | 
    | NL1009 | National Electronics | IGN | NL1009.pdf (285295 bytes) | 
    | NL1022 | National Electronics | IGN | NL1022.pdf (280039 bytes) | 
    | NL10277 | National_Electronics | Q~ | NL10277.pdf (102899 bytes) | 
    | NL10277-1 | National_Electronics | Q~ | NL10277.pdf (102899 bytes) | 
    | NL1051 | National Electronics | IGN | NL1051.pdf (323011 bytes) | 
    | NL1052 | National Electronics | IGN | NL1052.pdf (263222 bytes) | 
    | NL1053 | National Electronics | IGN | NL1053.pdf (293345 bytes) | 
    | NL1054 | National Electronics | IGN | NL1054.pdf (337574 bytes) | 
    | NL1096 | Svetlana | T~ | NL1096.pdf (64473 bytes) | 
    | NL323B | National Electronics | THY | NL3C23.pdf (335280 bytes) | 
    | NL393A | National Electronics | THY | NL3C23.pdf (335280 bytes) | 
    | NL3C23 | National Electronics | THY | NL3C23.pdf (335280 bytes) | 
    | NL5550 | National Electronics | IGN | NL5550.pdf (412568 bytes) | 
    | NL5557 | National Electronics | THY | NL714.pdf (364008 bytes) | 
    | NL5558 | National Electronics | R° | NL5558.pdf (456644 bytes) | 
    | NL5559 | National Electronics | THY | NL5559.pdf (363936 bytes) | 
    | NL5560 | National Electronics | THY | NL5560.pdf (343507 bytes) | 
    | NL5632   | National Electronics | THY | NL5632.pdf (339442 bytes) | 
    | NL5665 | National Electronics | THY | NL5665.pdf (267418 bytes) | 
    | NL5684 | National Electronics | THY | NL5684.pdf (314683 bytes) | 
    | NL6014 | National Electronics | THY | NL6014.pdf (404637 bytes) | 
    | NL604 | National Electronics | rr° | NL604.pdf (314979 bytes) | 
    | NL604L | National Electronics | rr° | NL604.pdf (314979 bytes) | 
    | NL606 | National Electronics | rr° | NL606.pdf (288035 bytes) | 
    | NL606L | National Electronics | rr° | NL606.pdf (288035 bytes) | 
    | NL610 (= 7723) | NationalElectronics |  | 7723.pdf (168509 bytes) | 
    | NL614 | National Electronics | r° | NL614.pdf (342962 bytes) | 
    | NL615 | National Electronics | r° | NL615.pdf (325087 bytes) | 
    | NL616 | National Electronics | r° | NL616.pdf (298941 bytes) | 
    | NL617 | National Electronics | r° | NL617.pdf (276814 bytes) | 
    | NL618 | National Electronics | r° | NL618.pdf (289549 bytes) | 
    | NL619 | National Electronics | r° | NL619.pdf (331536 bytes) | 
    | NL623 | National Electronics | r° | NL623.pdf (342970 bytes) | 
    | NL625 | National Electronics | r° | NL625.pdf (276181 bytes) | 
    | NL627 | National Electronics | r° | NL627.pdf (304841 bytes) | 
    | NL632B | National Electronics | THY | NL632B.pdf (411095 bytes) | 
    | NL635 | National Electronics | r° | NL635.pdf (302177 bytes) | 
    | NL635L | National Electronics | r° | NL635.pdf (302177 bytes) | 
    | NL635P | National Electronics | R° | NL635.pdf (302177 bytes) | 
    | NL643 | National Electronics | r° | NL643.pdf (315173 bytes) | 
    | NL649 | National Electronics | r° | NL649.pdf (212517 bytes) | 
    | NL653 | National Electronics | r° | NL653.pdf (281229 bytes) | 
    | NL660L (= 7786) | NationalElectronics |  | 7786.pdf (94335 bytes) | 
    | NL710 | National Electronics | THY | NL710.pdf (365901 bytes) | 
    | NL710L   | National Electronics | THY | NL710.pdf (365901 bytes) | 
    | NL714 | National Electronics | THY | NL714.pdf (364008 bytes) | 
    | NL715 | National Electronics | THY | NL714.pdf (364008 bytes) | 
    | NL716 | National Electronics | THY | NL716.pdf (427086 bytes) | 
    | NL730 | National Electronics | THY | NL730.pdf (414677 bytes) | 
    | NL732 | National Electronics | THY | NL732.pdf (264954 bytes) | 
    | NL740   | National Electronics | THY | NL740.pdf (273484 bytes) | 
    | NL740L | National Electronics | THY | NL740.pdf (273484 bytes) | 
    | NL740P | National Electronics | THY | NL740.pdf (273484 bytes) | 
    | NL741 | National Electronics | THY | NL740.pdf (273484 bytes) | 
    | NL741P | National Electronics | THY | NL740.pdf (273484 bytes) | 
    | NL760 | National Electronics | THY | NL760.pdf (240147 bytes) | 
    | NL760L | National Electronics | THY | NL760.pdf (240147 bytes) | 
    | NL760P | National Electronics | THY | NL760.pdf (240147 bytes) | 
    | NL761 | National Electronics | THY | NL760.pdf (240147 bytes) | 
    | NL761L | National Electronics | THY | NL760.pdf (240147 bytes) | 
    | NL761P | National Electronics | THY | NL760.pdf (240147 bytes) | 
    | NL778 | National Electronics | THY | NL778.pdf (277990 bytes) | 
    | NL778L | National Electronics | THY | NL778.pdf (277990 bytes) | 
    | NL778P | National Electronics | THY | NL778.pdf (277990 bytes) | 
    | NL8094/199 | Machlett Laboratories | R | 8094-199.pdf (174638 bytes) | 
    | NSP1 | Ferranti | q`° | NSP1.pdf (116565 bytes) |