The FU7085F is a ceramic-metal triode. It has thoriated tungsten cathode and forced air cooling of
plate. The tube maximum plate dissipation is 2.5kW
(Intermittent) and maximum frequency operation is 110MHz.
The tube is designed for oscillator in the industry high
frequency heating applications.
The tube can replace 7T85RB.
GENERAL CHARACTERISTICS
Electrical
Cathode........Thoriated Tungsten
Filament Voltage.......6.3V
Filament Current......31~38A
Transconductance.....5mA/V
Amplification Factor...21
Interelectrode Capacitances:
Filament to Grid........15pF
Filament to Plate..0.5pF
Grid to Plate.......13pF
Mechanical
Overall Length...221mm
Overall Diameter.130mm
Net Weight.....2.5kg
Mounting PositionVertical, Plate Up or Down
COOLING
Cooling......Forced Air
Air Flow.......3.3m3
/min
Static Pressure Loss....... 170Pa
Maximum Envelope Temperature 250 degrees centigrade
TYPICAL OPERATION
Continious , Intermittent
Plate Voltage.... 7.5, 8 kV
Plate Current.... 0.9, 1.0 A
Grid Current...... 200, 250 mA
Grid Resistor. 4500, 4500 ohm
Output Power... 5.1, 6 kW
Note :
Values for intermittent service are those for 30
seconds of operating time and 50% of duty Factor.
