The 6SN7GT is a British made glass tubular version of this much loved double triode valve from the 1940's. Each half of the 6SN7 is electrically equal to the 6J5 triode.

The wide glass tube envelope is 28 mm in diameter and excluding the IO base pin length, stands 65 mm high.

References: Datasheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type 6SN7GT was first introduced^¶ in 1941.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	g1(2)	a(2)	k(2)	g1(1)	a(1)	k(1)	h	h

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.8	250	-0	3	7.7k	1.6

Thanks to Frank Philipse for supplying the above PDF datasheet

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