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ID = 6231
Tube type:  Screen-grid Tetrode 
Identical to 7851

Base Miniatur-7-Pin-Base B7G, USA 1940
Filament Vf 2.5 Volts / If 0.2 Ampere / Indirect
Description Electrometer tetrode intended as high-gain current amplifier for input currents in the order of nanoamperes. Typical operating conditions: 11.0V plate and G2, -2.2V G1, 16 microamps plate current, 40 micromhos transconductance.
Must be shielded from light and e.m. fields.
GE and Tung-Sol. 
Information source Essential Characteristics, GE 1973   
- - Manufacturers Literature   

7851: Bericht in Electronic World, 10/1963
Daniel Consales

7851_sockel.png 7851: Essential characteristics
Peter Hoddow

Just Qvigstad
7851: Bericht in Electronics World, 10/1963
Daniel Consales

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