The 1T5GT is a battery audio output beam tetrode.

In single ended output service the anode load would be 14,000 Ohms. The audio output is low, but respectable for a valve operating from dry cells and having a low filament current.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 59 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	-	f+	a	g2	g1	-	f-	-

 
Absolute Maximum Operating Conditions

Beam Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pout	D
	1.4	0.05	90	90	-6.0	6.5	1.5	250,000	1.15	0.17	7.5%

Thanks to Frank Philipse for supplying the above datasheet

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