Rare Soviet 6S5S tube - generator, detector or low frequency amplifier. It is direct replacement for the 6C5 (metal envelope tube – so this one has another shape), 6C5GT tube and the chinese 6C5P
Russian pulse modulator triode GMI-38 - a tube for switching pulse power in pulse modulators with anode voltage in a pulse up to 20kV and a current in a pulse more than 24A. Power anode 60W
Russian pulse modulator triode GMI-42B tube for switching pulse power at an anode voltage of no more than 30kV and an anode current in a pulse of up to 30A. Power anode 500W. NOS