6F5 GE metal can NOS 1946 (1.2ma Gm=1700)

6F5 GE metal can NOS 1946 (1.2ma Gm=1700) (strong single)

5 pins

(6F5 octal base is similar spec-wise to 7B4 loktal, Mu=100)

Zenith 10S669 radio 1941
Zenith 9S369 radio