Summary

Output pentode. Manufacturer: Ken-Rad Tube & Lamp Corporation, Owensboro, Kentucky, USA.
The 6F6 was the first metal output valve, released in 1935. It had the same electrical characteristics as the 42 and, except for the heater voltage, the 2A5.
The JAN-CKR prefix to the type number indicates that this valve was made for the US Services during or shortly after World War II (1939-1945). SC961A is a US Signal Corps marking.
6.3 V indirectly heated cathode.

Physical Description

Cylindrical metal bulb on octal base with 7 pins present.

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