Brand

• (no filter) 

  EUROPE (17) CEE (1) DIVERSES MARQUES (2) INTERNATIONAL (21) MAZDA (1) ORION (1) PHILIPS (1) RTC (1) SIEMENS (2) USA (11)

Interests

•  Audiophiles (41)
•  Collectors (58)
•  Radio hams (58)

Socket

•  B7G - Miniatur (7 pins) (2)
•  B8A - Rimlock (8 Pins) (2)
•  B9A - Noval (9 pins) (19)
•  B10C - Decal (4)
•  K8A - Octal (8 pins) (6)
•  P8A - Transcontinental (8 pins) (1)
•  U6A (6 Pins) (1)
•  U7A (7 Pins) (1)

Heating parameters

•  A - 4V (1)
•  E - 6.3V (21)
•  N - 6.3V / 12.6V according to series or parallel assembly (8)
•  R - 8V (4)

Décennie

•  1930 (4)
•  1940 (2)
•  1950 (5)
•  1960 (8)