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6F5 Sylvania metal can NOS 1954 (1.0ma Gm=1500)
NOS mA = 0.8-1.0mA+
NOS Gm = 1500+
(6F5 octal base is similar spec-wise to 7B4 loktal, Mu=100)
Zenith 10S669 radio 1941Zenith 9S369 radio