The 6SA7GT is an interesting exhibit as it has an American type designation but is made by Mullard. As a heptode it was designed as a self oscillating mixer for radio reception.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 68 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	m	h	a	g2,4	g1	k,g5	h	g3

 
Absolute Maximum Operating Conditions

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	100	-2	3.5	8.5	1M	0.45

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 10 November 2008 {find valves by name}