Sensibly equivalent¶ to:
The FC13C is an octode frequency changer. It was made in two versions, the FC13 on a Ct8 base and this version on a B7 base.
In use the local oscillator would be formed between the cathode and grid 2 - in fact a pair of vertical rods. The signal usually being added at g4, the top cap. The screen grids either side of the signal grid are g3 and g5.
Such golden external metalised valves can be seen in radio sets from the mid1930's to early 1940's.
The classic envelope is 42 mm in diameter and, excluding the B7 base pins, is 110 mm tall.
References: Datasheet & 1043. Type FC13C was first introduced in 1935.
Absolute Maximum Operating Conditions¶
Updated December14, 2012. shape:classic construction:pinch type:octode age:1930.1940 base:b7 heater:200ma pins:7 pin:1.g2 pin:2.g1 pin:3.g3.g5 pin:4.h pin:5.h pin:6.m.k pin:7.a pin:tc.g4