The 3CX15000H3 is a forced air cooled, ceramic—metal medium-mu power triode containing a thoriated tungsten carbide cathode, which can be installed directly on the industrial heating service as it is equipped with the flexible filament lead.
The tube is used mianly in industrial oscillator of which the frequecy is from low frequecy to rather-low frequency (30kHz-90MHz), and also used in modulator of AM broadcast or linear amplifier.

GENERAL  CHARACTERISTICS
Filament Voltage                    6.3  V
Filament Current                    162±10  A
Interelectrode Capacitance
Grid Cathode                   55  pF
Plate Cathode                 1.4  pF 
Plate Grid                         43  pF
Maximum Operation Frequency         90  MHz
Operation Position                                      Vertical, base up or down
Cooling                                                         Forced Air 
Maximum Seal Temperature                     250
Maximum Height                                         see outline
Maximum Diameter                                    see outline
Net Weight                                                   5.9 kg