Electron Tube High Power Triode Fd921s for Oscillator in High Frequency Heating Equipment

The FD-921S is a high power glass-metal triode,It
has thoriated tungsten cathode and water cooling of
plate.
The tube maximum plate dissipation is 10kW and
maximum frequency operation is 26MHz.
The tube designed for oscillator in the industry high
frequency heating applications.
GENERAL CHARACTERISTICS
Electrical
Cathode............…....Thoriated Tungsten
Filament Voltage...…......…........…7V
Filament Current...…...…...…...…70~80A
Transconductance.............….…..…20mA/V
Amplification Factor......…...............30
Interelectrode Capacitances:
Filament to Grid..............….…..35pF
Filament to Plate.................0.4pF
Grid to Plate.....................….39pF
Mechanical
Overall Length.........…............330mm
Overall Diameter…................…φ145mm
Net Weight...............….…......…..5kg
Mounting Position…....…..…Vertical, Plate Down
COOLING
Cooling............…...…Water & Forced Air
Plate Water Flow...…............…≥20L/min
Air Flow of Core.......…..…..........≥50m3 /h
Maximum Envelope Temperature….…..….….150ºC
Water Jacket Outlet Temperature…............≤55ºC
MAXIMUM RATINGS
Frequency.......................26 MHz
Filament Startup Current….............315 A
Plate Voltage.........….….....…..15 kV
Plate Dissipation..................80 kW
Grid Dissipation..................2.6 kW
TYPICAL OPERATION
Frequency......….....….....….…26 MHz
Plate Voltage...….................12 kV
Grid Voltage..................…-600 V
Plate Current...........…..….....11.5 A
Grid Current….............…...…..…1.6 A
Prompting Power.............….3100 W
Prompting Voltage...........…..…1650 V
Output Power......…....................…105 kW
We also manufacture all the following models.