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Beckman 931 electrometer tetrode

Size This valve measures 110x37mm overall and has a 4 pin base

 

This is a Sylvania type 1229 with an added external aquadag shield and insulating coating around the grid connection at the top. These tubes are derivatives of the type 32 receiving tetrode, selected for lowest grid current.

Filament voltage 2V
Filament current 60mA
Max anode voltage 180V

Label Label

 931

Donated by Gerry Brumm; information from Bob Weiss

This file was last modified 15:38:53, Saturday November 12, 2011