NOS and unused before Russian GM70 tube with very rare copper plate.
The GM-70 triode is used as a low-frequency power amplifier in RF equipment. Military equipment. Near 845 Equivalent.
Rated electrical data:
glow voltage 20V;
filament current 3A;
plate voltage 1.5kV;
cathode emission current 800mA (plate voltage and grid potential = 180V);
long-dissipated anode power 125W;
differential transconductance 6mA/V (plate voltage = 600V and plate currents = 160mA, 260mA);
gain 6.7 (plate voltages = 1200V, 1000V and plate current = 125mA);
dielectric resistance 20 megaohm;
reverse grid current 40 microamp;
max glow voltage 20V;
min glow voltage 19V;
max plate voltage 1.5kV;
max long-dissipated anode power 125W;
max minute-dissipated anode power 150W.