FU-33 is a direct thermal carbonization thorium-tungsten cathode glass triode anode cooling method by natural cooling,the maximum anode dissipation is 350W,the maximum operating frequency is 30MHz,the output power is 1000W,the pipes are mainly used for amplification with the oscillation and radio equipment for industrial high frequency heating equipment.the tube can instead the U.S.833A/C.

Note:quenching glass bulb when the anode dissipation power greater than 300W.