The 1E7G is a battery double pentode designed to be used in push pull to generate about a half a Watt. The input between the control grids would need to be about 15 Volts peak to peak. The anode load is specified as 24,000 Ohms.

Visual inspection through the top mica reveals the three wire grids, formed as normal on notched rods.

The classic envelope is 36 mm in diameter and, excluding the IO base pins, is 90 mm tall.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	Pout
	2.0	0.24	135	135	-7.5	10.5	3.5	0.57W

Thanks to Frank Philipse for supplying the above datasheet

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