Jumbo 4-pin bayonet (1918)
Connexion au sommet et latérale.
Utilisé par
Transmittertube (Radio)
Chauffage
Vf 5 Volt / If 7.5 Ampère / Direct
Description
This code can be found printed on some tubes manufactured by Heintz & Kaufman: 'Gammatron' was used as trademark by this manufacturer.
4-pin Jumbo base.
