Russian tubes GM-70 is graphite plate triode. An quality equivalent of the has similar and near characteristics as RCA 845 Triode. Military equipment.
USED

"Ulyanovsk" factory.

Cathode type tugsten, carbidized, direct heating
Application field Low frequency power amplification in special equipment
Brief application amplification
Envelope glass with base
Cooling method air
Dimensions 185mm x 65mm
Mass 280g
Filament voltage 20 V
Filament current 2,7 - 3,3A
Mutual conductance 4,8 to 7,2mA/V
Gain coefficient 5,4 to 8
Output power 125W
Maximum anode voltage 1,65kV

Tubes can have some oxidation traces on the base, because of age.