Brand

• (no filter) 

  GENERAL ELECTRIC (1) MARQUES DIVERSES / VARIOUS BRANDS (8) USA (2)

Interests

•  Audiophiles (7)
•  Collectors (11)
•  Radio hams (11)

Socket

•  B7G - Miniatur (7 pins) (4)
•  B8G - Loctal 8 pins (1)
•  K8A - Octal (8 pins) (4)
•  U7A (7 Pins) (1)

Heating parameters

•  1.2 to 1.4V (1)
•  6.3V (6)
•  6.3V / 12.6V according to series or parallel assembly (2)
•  12,6V (1)

Décennie

•  1930 (2)
•  1940 (5)
•  1950 (1)