The 7C6 is a triode double diode, it was probably used in superhet receivers for signal and AGC detection and post AM detection amplification.

The wide glass tube envelope is 26 mm in diameter and, excluding the B8B base pins, is 55 mm tall.

 
Pin Connections

B8B	1	2	3	4	5	6	7	8
	h	a	g1	k	a(d2)	a(d1)	k	h

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.15	250	-1	1.3	0.1M	1.0

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 05 July 2007 {find valves by name}