Brand

• (no filter) 

  DARIO (1) EUROPE (8) MARCONI (1) MARQUES DIVERSES / VARIOUS BRANDS (2) MINIWATT DARIO (1) RUSSIE (1) TELEFUNKEN (1) ULTRON (1) USA (2) VALVO (1)

Interests

•  Audiophiles (7)
•  Collectors (19)
•  Radio hams (15)

Socket

•  B8D - Subminiatur (5 wires) (1)
•  B9A - Noval (9 pins) (5)
•  K8A - Octal (8 pins) (2)
•  P8A - Transcontinental (8 pins) (1)
•  U6A (6 Pins) (1)

Heating parameters

•  1.2 to 1.4V (1)
•  6.3V (7)
•  12,6V (1)
•  19V (1)

Décennie

•  1930 (3)
•  1940 (1)
•  1950 (5)