Brand

• (no filter) 

  EUROPE (13) DIVERSES MARQUES (2) ELECTRO HARMONIX (3) INTERNATIONAL (20) JJ Electronic (38) PHILIPS (5) RCA (4) RTC (1) RUSSIE (3) TUNGSOL (1) USA (24) VALVO (1)

Interests

•  Audiophiles (107)
•  Collectors (96)
•  Guitarists (39)
•  Radio hams (96)

Socket

•  B7G - Miniatur (7 pins) (4)
•  B9A - Noval (9 pins) (34)
•  B10C - Decal (1)
•  K8A - Octal (8 pins) (23)
•  UX Base (300B type, 4 pins) (1)

Heating parameters

•  B - 7.5V (1)
•  C - 4,5V (2)
•  E - 6.3V (33)
•  G - 5V (1)
•  N - 6.3V / 12.6V according to series or parallel assembly (23)
•  O - 12,6V (2)
•  Q - 17.5V (1)

Décennie

•  1920 (1)
•  1940 (4)
•  1950 (4)
•  1960 (2)