Sensibly equivalent¶ to:
The 12SF7 is a diode pentode for RF and IF amplification. The valve has a variable-μ characteristic and the diode is intended for use as an AGC detector.
Command radios of WWII like the R-23 and R-23A used the 12SF7 as second IF stages with their own local AGC.
The RCA logo.
The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins is 52 mm tall.
Reference: Datasheet & tuberadio Type 12SF7 was first introduced in 1940.
Absolute Maximum Operating Conditions¶
Updated January 11, 2017. shape:thin.metal.tube construction:glass.disc type:diode.pentode age:1940.1950 base:io heater:12.6v pins:8 pin:1.m pin:2.g1 pin:3.k.g3.s pin:4.g2 pin:5.a(d) pin:6.a pin:7.h pin:8.h