Brand

•  BELVU
•  FIVRE
•  GECOVALVE
•  GENERAL ELECTRIC
•  IBM
•  MARQUES DIVERSES / VARIOUS BRANDS
•  MAZDA
•  SYLVANIA
•  TELEFUNKEN
•  USA

Interests

•  Audiophiles
•  Collectors
•  Radio hams

Socket

•  B7G - Miniatur (7 pins)
•  B8G - Loctal 8 pins
•  B9A - Noval (9 pins)
•  K8A - Octal (8 pins)
•  M7A - British 7 pins
•  P8A - Transcontinental (8 pins)
•  U7A (7 Pins)

Heating parameters

•  1.2 to 1.4V
•  2V
•  6.3V
•  6.3V / 12.6V according to series or parallel assembly
•  12,6V
•  24V

Décennie

•  1930
•  1940
•  1950
•  1960

Connection on the top

•  With
•  Without