Brand

•  JJ Electronic
•  PHILIPS sans Logo
•  SIEMENS
•  SOVTEK

Interests

•  Audiophiles
•  Collectors
•  Guitarists
•  Radio hams

Socket

•  B9A - Noval (9 pins)
•  K8A - Octal (8 pins)

Heating parameters

•  6.3V
•  6.3V / 12.6V according to series or parallel assembly

Connection on the top

•  Without