The 1E7G is a battery double pentode designed to be used in class A 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.
References: Datasheet & 1043. Type 1E7G was first introduced in 1936.
Absolute Maximum Operating Conditions¶
Updated February 21, 2013.