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1E7G

 
See also:
National Union 1E7G Box
    
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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.
The National Union brand and the words that this was an export valve.
The wire grids can be seen within the bright anodes. Above the top mica is the filament tension springs. Each pentode has a single inverted V filament. The screen grids are bridged with tape.
Top view showing the grid spacing.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 91 mm tall.
References: Data-sheet & 1043. Type 1E7G was first introduced in 1936.

 

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 PDF datasheet.
Updated May 17, 2021.
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