The 1C2 is a miniature heptode frequency changer for use in dry battery powered radio receivers. Domestic long and medium wave receivers would have this as the mixer to produce a 455 kHz IF from the incoming signal. It can be used with a separate oscillator, but was probably designed as a self oscillating mixer, in the manner of other pentagrid converters.

The operating parameters for the triode section refer to the oscillator formed between the inner grids of the heptode.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 45 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	f+	a	g2	g1	g4	g3	f-,g5

 
Absolute Maximum Operating Conditions

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	1.4	0.05	85	60	0	0.7	0.15	0.65M	0.325

Triode	Va	mAa
	35	1.6

This exhibit was last updated on 20 December 2006