Electron tube/Vacuum Tube/Triode 7T85RB electron tube
Product Description
electron tube 7T85RB vacuum capacitor or triode is metal ceramic triode, using the thorium-tungsten cathode and air cooling anode. Maximum anode dissipation power can reach up to 2500W Intermittent use, the highest operating frequency 110MHz. This tube is applicable for industrial high-frequency equipment as oscillator and can be used interchangeably with type 7T85RB produced by TOSHIBA
Electron tube 7T85RB is a forced air cooled, ceramicmetal triode containing a thoriated tungsten carbide cathode intended for use in industrial high frequency heating service as an oscillator.
GENERAL CHARACTERISTICS
Filament Voltage 6.3 V
Filament Current 35 A
Transconductance (Ia=0.35A) 5 mA/V
Amplification Factor 21
Interelectrode Capacitance
Grid Plate 13 pF
Grid Cathode 15 pF
Plate Cathode 0.5 pF
Maximum Operating Frequency 110MHz
Maximum Height 215 mm
Maximum Diameter 130 mm
Appro. Weight 1.5 kg
Operation Position Vertical
Cooling Forced Air
Minimum Air Flow 3.3 m3/min
Minimum Static Pressure 166 Pa
Maximum In-coming Air Temprature 45
Maximum Anode Core and Seal Temprature
250
MAXIMUM RATING ABSOLUTE #118alue
RF Power Amplifier and Oscillator
- Class C Telegraphy
DC Plate Voltage 8 8.5 kV
DC Plate Current 1 1.2 kV
DC Grid Current 0.3 0.35 A
Plate Dissipation 2.5 2.5 kW
Grid Dissipation 130 150 W
TYPICAL OPERATION(Oscillation #118alue)
DC Plate Voltage 7.5 8 kV
DC Plate Current 0.9 1 A
Plate Output Power 5.1 6 kW
DC Grid Current 200 250 mA
Grid Impedance 4.5 4.5 k
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