Model:
EF37A (6J7)
Brand:
Mullard
Classification:
Pentode (red)
Model:
EF37A (6J7)
Brand:
Mullard
Classification:
Pentode (grey)
Model:
EF50/CV1091
Brand:
Mullard
Classification:
Pentode
Model:
EF86 (6267)
Brand:
Bugle Boy, Germany
Classification:
Pentode
Model:
EF86/CV4085 (6267)
Brand:
GEC
Classification:
Pentode
Model:
6267 (EF86)
Brand:
Siemens
Classification:
Pentode
Model:
EF86 (6267)
Brand:
Telefunken
Classification:
Pentode
Model:
EF91 (6AM6)
Brand:
Westinghouse
Classification:
Pentode