The 6Q7GT is a commercial double diode triode designed for receiver audio use.

The diodes would be for signal and AGC rectification and the triode would act as AGC amplifier or first audio amplifier. This is a miniature glass tubular version of this valve, we also have the older version with the classic glass envelope.

The Ferranti logo is printed on the envelope. The triode sits above the pair of diode anodes. The blackening of the triode anode enhances heat dissipation by radiation.

The wide glass envelope has a maximum diameter of 29 mm and a length excluding the IO base pins of 69 mm.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	m	h	a	a(d2)	a(d1)	nc	h	k	g

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.3	250	-3	1	58k	1.2

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 03 January 2008 {find valves by name}