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ID = 77863
United States of America (USA)
Brand: Wang Lab; Tewksbury, MA
Tube type:  Numerals- and Symbols indicating tube   Indication 
Identical to 340-0004

Base SPECIAL TUBEBASE in general
Filament No heater

Digits: 0...9

Probably an NL840 made for Wang by National Electronics.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
18 x 49 x mm / 0.71 x 1.93 x inch
340-0004: afC
Aldo Canepa


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