The 7T85RB is a forced air cooled, ceramic-metal triode containing a thoriated tungsten carbide cathode intended for use in industrial high frequency heating service as an oscillator.
Filament Voltage 6.3 VFilament Current 35 ATransconductance (Ia=0.35A) 5 mA/VAmplification Factor 21Interelectrode Capacitance Grid Plate 13 pF Grid Cathode 15 pF Plate Cathode 0.5 pFMaximum Operating Frequency110MHzMaximum Height 215 mmMaximum Diameter 130 mmAppro. Weight 1.5 kgOperation Position VerticalCooling Forced Air Minimum Air Flow 3.3 m3/minMinimum Static Pressure 166 PaMaximum In-coming Air Temperature 45Maximum Anode Core and Seal Temperature 250 MAXIMUM RATING ABSOLUTE #118alueRF Power Amplifier and Oscillator- Class C Telegraphy
DC Plate Voltage 8 8.5 kVDC Plate Current 1 1.2 kVDC Grid Current 0.3 0.35 APlate Dissipation 2.5 2.5 kWGrid Dissipation 130 150 W
TYPICAL OPERATION (Oscillation #118alue)DC Plate Voltage 7.5 8 kVDC Plate Current 0.9 1 APlate Output Power 5.1 6 kWDC Grid Current 200 250 mAGrid Impedance 4.5 4.5 kΩ