Lamp GM-70 "Queen of triodes" is a modulating triode for working as an amplifier of low-frequency oscillations in modulator circuits. Decor is glass. Working position - vertical. Weight 280 g.

1. Filament current 3.1 ± 0.3 A.
2. Anode current (at Uс=175 V) ³ 20 mA.
3. Anode current (at Uс=200 V) ³ 80 mA.
4. Emission current (at Un=Uс=0.18 kV) ³ 0.8 A.
5. Grid current reverse 40 μA.
6. Insulation resistance between the anode and the rest of the electrodes ³ 20 MΩ.
7. Insulation resistance between the grid and the rest of the electrodes ³ 20 MΩ.
8. The steepness of the characteristic (at Ua=0.6 kV, Ia=0.16 and 0.26 A) 5.9 ± 1.3 mA/V.
9. Gain (at Uа=1.2 kV, Iа=125 mA) 6.9 ± 1.3.
10. Interelectrode capacitances:
– grid – cathode 6.5 pF,
– anode – cathode 4.5 pF,
– grid – anode 10.5 pF.
11. Durability ³ 1000h.
12. Lifetime criteria: emission current ³ 0.6 A.

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