FU8085F Vacuum electron tube equivalent to 8T85RB for HF dielectric heating
The tube can replace 8T85RB.
The FU8085F is a ceramic-metal triode. It has thoriated tungsten cathode and forced air cooling of plate.
The tube maximum plate dissipation is 10kW and maximum frequency operation is 45MHz.
The tube is designed for oscillator in the industry high frequency heating applications.
GENERAL CHARACTERISTICS
Electrical
Cathode.Thoriated Tungsten
Filament Voltage............12V
Filament Current......38~43A
Transconductance.......11mA/V
Amplification Factor......21
Interelectrode Capacitances:
Filament to Grid.....22pF
Filament to Plate..0.9pF
Grid to Plate.......16pF
Mechanical
Overall Length...313mm
Overall Diameter.204mm
Net Weight....9kg
Mounting Position...Vertical, Plate Down
COOLING
Cooling......Forced Air
Plate Dissipation.... 4, 6, 10 kW
Min. Air Flow... 8, 16, 22 m3/min
Min. Static Pressure Loss. 60, 200, 400 Pa
Incoming Air Temperature. 40 degrees centigrade
Maximum Envelope Temperature.250 degrees centigrade
MAXIMUM RATINGS
Frequency. 45, 45 MHz
Filament Startup Current. 80, 80 A
Plate Voltage.... 12, 12 kV
Plate Current.... 2.5, 3 A
Grid Current..... 300, 400 mA
Plate Dissipation.. 10, 10 kW
Grid Dissipation.... 250, 300 W
TYPICAL OPERATION
Plate Voltage..... 8, 11, 11.5 kV
Plate Current..... 2, 2.3, 2.8 A
Grid Current... 220, 250, 270 mA
Grid Resistor..... 4000, 4500, 5000 Ohm
Output Power. 12, 17.5, 23.5 kW
Note :
Values for intermittent service are those for 10 seconds of operating time and 50% of duty Factor
