The FU-32 is a modern implementation of the 1950's 832A double beam tetrode. The original valve was made for power amplifier use in VHF transmitters. This 21st century Chinese version is designed for audio amplifier use. The Type designation appears to be written in Cyrillic characters.
We have yet to locate the specific data-sheet for this valve.
The oval anode with the bright beam plate visible top and bottom.
A closer view: the cathode tube has flat sides and rounded ends.
Above the beam plate and fixed to it is the top screen. The cathode shape is clear to see.
The lower mica: the insulated heater wires can be seen entering the base of the cathode.
The wide glass tube envelope is 51 mm in diameter, and excluding the B7A base pins is 74 mm tall.
