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 Ω.
The Sylvania name on the base cap.
As a low power device both anodes are left bright. The filament loops are held in tensioning springs at the top.
The top mica showing the S support holding the pair of tensioning springs.
The top mica in detail.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 88 mm tall.
References: Data-sheet & 1043. Type 1E7G was first introduced in 1936. See also1936 adverts.
