The 7C6 is a double diode triode, and no specific design use is quoted. Normally such a valve would be used as signal and AGC detector plus first audio amplifier stage in broadcast receivers. This valve is unusual in that the anode impedance is high, maybe this valve was to be used for video demodulation and amplification.

The wide glass tube envelope is 28 mm in diameter and, excluding the B8B base pins, is 54 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}