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 screen grid. The signal usually being added at g4, the top cap.

Such golden external metalised valves can be seen in radio sets from the late 1930's and early 1940's.

The classic envelope is 42 mm in diameter and, excluding the B7 base pins, is 110 mm tall.

 
Pin Connections

B7	1	2	3	4	5	6	7	tc
	g2	g1	g3,g5	h	h	m,k	a	g4

 
Absolute Maximum Operating Conditions

Octode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	13.0	0.2	200	70	-1.5	1.6	3.8	2M	0.6

Thanks to Frank Philipse for supplying the above PDF datasheet

 

This exhibit was last updated on 08 June 2007