FU-606 tube is directly heated thorium carbide tungsten cathode glass triode,

which is equivalent to foreign models TB5/2500, 6T50, 7092 and other tubes.

The following are the models of the equal series

FU-33、FU-501FU-605 (6T51) 、

FU-81J、FU-13J、

FU-501JFU-605 (FU - 3051F，6T51)、

FU-606F (6T58RAFU-3062F(E3062C，7T62R)、

FU-724F、FU-8801F(7T84RB)、FU-915F/S、

7T85RB (FU-8802FFU-947F)、

7T69RB(FU-8702F，FU-946F)