GOST 21106.0-1975 Oscillator, modulator and regulation tubes anode dissipated power more than 25 W. Method of measurements of electrical parameters. General principles*, 1975-12-23 Update
GOST 21106.9-1977 Oscillator, modulator and regulation tubes with anode dissipated power above 25 W. Method of measurements of pulse anode and grids currents*, 1977-12-23 Update
GOST 18485-1973 history
1973GOST 18485-1973 Modulator tubes for operation in pulse conditions. Methods for measurement of electrodes pulse voltages