The 12SQ7GT/G is a double diode triode with heaters designed to operate from the 12.6 volts available in a vehicle. The diodes are for AM signal detection and AGC detection whilst the triode section is for first audio amplification. This is typical for a valve used in a radio superhet receiver.

Apart from the 12.6 volt heaters the valve characteristics are equal to the 6SQ7 the GT is for glass tubular construction.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 60 mm tall.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	12.6	0.15	250	-2.0	0.9	91,000	1.1

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 12 June 2007 {find valves by name}