PET3CX20000H3Drop-in equivalent of 3CX20000H3
Air Cooled Triode For Industrial RF Heating
Manufactured in India, in a world-class facility equipped with high quality machinery, materials and components sourced from reputed suppliers in America, Europe and Japan. Data Sheet of 3CX20000H3 / PET3CX20000H33CX20000H3 is a forced- air cooled, ceramic-metal power triode with a robust mesh filament for use in industrial radio-frequency heating
Electrical Characteristics of 3CX20000H3 Filament . . . . . thoriated tungsten Filament voltage (see note 1) . . . 10.0 V Filament current . . . . 160 A Surge Filament current (peak) (see note 2) . 800 A Filament cold resistance . . . . 6.8 mΩ Peak usable cathode current . . . 50 A Amplification factor . . . . 20 Inter – electrode capacitances: Grid to anode . . . . . 46 pF Grid to filament . . . . 77 pF Anode to filament . . . . 2.1 pF Mechanical Characteristics of 3CX20000H3 Connections . . . . . Filament leads and grid contact flanges Operating position . . . . Vertical, either way up Maximum operating temperature . . 250 degree C Maximum dimensions . . . . See outline drawing Net weight . . . . . 9 kg (10 pounds) approx Accessories of 3CX20000H3 Cathode connector . . . . CWPA830 For frequencies above 2MHz, CWPA830 should be used in conjunction with a strip connection to provide a low inductance cathode return. Cooling Sufficient air must be passed through the radiator to keep the temperatures of ceramic to metal seals and of the anode (measured next to the radiator) below the maximum rated value of 250 degree C. The air flows required to maintain seal temperature at 225 degree C in an ambient temperature of 50 degree C and with an operating frequency of less than 30 MHz are shown in the following table. An additional air flow is required for the filament seals. 100ft3/min directed at the centre contact ring, ½ inch below the outer contact ring, through a 1 ½ inch internal diameter air duct at 45 degree to the axis of the tube, is sufficient for operation up to 30 MHz at 50 degree C ambient and 10, 000 ft altitude. Minimum Radiator Air Flow Requirements for 3CX20000H3 Sea Level 10, 000 Feet Pressure Pressure Anode Air Drop Air Drop Dissipation Flow inches Flow inches Watts ft3/min Water ft3/min Water 10, 000 320 0.9 464 1.1 15, 000 625 2.1 910 2.8 20, 000 1010 4.3 1475 5.8 The values given allow for maximum filament and grid dissipation in addition to the anode dissipation shown. The air cooling is assumed to flow over the grid seal* and through the radiator. If the air flows through the radiator towards the grid seal, 20% additional air flow should be provided as indicated by 33% higher pressure drop across the radiator.* * Indicates a change Radio Frequency Oscillator For Industrial Service (Class C conditions, one tube) Maximum Ratings of 3CX20000H3 (Absolute Values) Frequency . . . . . 90 MHz max Anode voltage d.c. . . . . 12 kV max Anode current d.c.(see note 3) . . . 8.0 A max Anode input power . . . . 80 kW max Anode dissipation . . . . 20 kW max Grid voltage d.c. . . . . -2000 V max Grid current d.c. .(See note 4) . . . 1.5 A max Grid dissipation . . . . . 750 W max Cathode current d.c. . . . . 10.0 A max Typical Operating Conditions of 3CX20000H3 Frequency . . . . . 30 30 MHz Anode voltage d.c. . . . . 7.5 10.0 kV Anode current d.c. . . . . 8.0 7.9 A Anode dissipation . . . . 9 14 kW Grid voltage d.c. . . . . -800 -900 V Grid resistor . . . . . 570 1130 Ω Grid current d.c. . . . . . 1.4 0.8 mA Grid dissipation . . . . . 560 296 W Drive power . . . . . 1670 960 W Anode input power . . . . 60 79 kW Anode output power . . . . 51 65 kW Output power less drive . . . 49.3 64 kW NOTES
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