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Russian 'geh'Russian 'oo'81Russian 'ehm' RF pentode. This monster measures 261 x 101mm. Filament is 12.6V/11A carbonised thoriated tungsten. At 2kV anode the valve can generate 700W output.

The anode is connected to one top cap (the left one in the picture), G3 to the other and this is also connected to the base.

Base connections are:1, 2 filament (5 is centre tap); 3 G1; 4 G2; 6 G3.

 
View of the internal structure of this monster Valve internals
Top and bottom views Valve baseTop view of valve
GU81M

This file was last modified 14:58:15, Tuesday September 02, 2014