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This unknown tetrode is for battery operation as the 2.0 Volt filament shows. The screen grid is connected to one side of the single inverted V filament.
Only one side of the envelope is silvered and on the reverse the full electrode structure is revealed.
The balloon envelope is 40 mm in diameter, and excluding the B4 base pins is 93 mm tall.
Reference: Observation.

 

Pin Connections
B4
1
2
3
4
tc
a
g1
f
f
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
2.0
Updated March 01, 2013.
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