Electron tube TH582:

Cathode Thoriated tungsten 
Heating Direc t 
Filament voltage                         4.2 V(1) 
Filament current                         146A(1) 
Interelectrode capacitances, approx: 
cathode-control-grid                               72pF 
Control-grid-screen-grid                          93pF 
Screen-grid-anode                                 13.2pF 
Transconductance(la=2.5A,Ug2=300V) ≥80mA/V 
Internal amplification factor,average 8 
Operating position Vertical,anode up 
weight, approx .                                   4.1Kg 
Dimensions See page                           95 
Anode cooling(2) Hypervapotron 
Air flow ,min.                                         15l/min 
Pressuer at water inlet,max.                 5105Pa 
Temperature at air water outlet, max.  80 
Cooling at the sealing between electrode terminal and ceramic, Forced air 
Temperature on the surface of the tube,max. 300