PET3CW30000H3Drop-in equivalent of 3CW30000H3
Water 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 3CW30000H3 / PET3CW30000H33CW30000H3 Water-cooled, ceramic/metal power triode with a robust mesh filament, for use in industrial radio-frequency heating
Electrical Characteristics of 3CW30000H3 Filament . . . . . Thoriated tungsten Filament voltage (see note 1) . . . 6.3 V Filament current . . . . 160 A Surge Filament current (peak) (see note 2) . 800 A Filament cold resistance . . . . 4.7 mΩ Peak usable cathode current . . . 35 A Amplification factor . . . . 20 Inter – electrode capacitances: Grid to anode . . . . . 39 pF Grid to filament . . . . 58 pF Anode to filament . . . . 1.9 pF Mechanical Characteristics of 3CW30000H3 Connections . . Filament leads, anode and grid contact flanges Operating position . Vertical, either way up Maximum operating temperature 250 ⁰C Maximum dimensions . see outline Net weight . . 4 kg (8.8 pounds) approx Accessories of 3CW30000H3 Water coupling, supplied with 3CW30000H3 . PA323A Thermal fuse available for 3CW30000H3 . PA85E Cathode connector . . . . PA830 For frequencies above 2MHz, CWPA830 should be used in conjunction with a strip connection to provide a low inductance cathode return. Cooling Anode of 3CW30000H3 is cooled by circulating water through the removable anode water jacket. The table below lists the minimum water flow requirement for adequate anode cooling at various anode dissipation levels. In all cases, the outlet water temperature must not exceed 70 ⁰C nor should inlet water pressure exceed 60 psi. This table is based upon 20 ⁰C temperature rise. Additional forced-air cooling of the tube base is also required to maintain ceramic-to-metal seal temperature below the 250 ⁰C maximum. Approximately 50 ft3/min of cooling air directed into the base structure should be adequate. Minimum Water Cooling Requirements of 3CW30000H3 Anode Water Pressure Dissipation Flow Drop (kW) l/min (psi) 20 15 3.5 25 18 4.0 30 22 4.5 35 25 5.0 Radio Frequency Oscillator For Industrial Service (Class C conditions, one tube) Maximum Ratings (Absolute Values) Frequency . . 90 MHz max Anode voltage d.c. . 12 kV max Anode current d.c.(see note 3) 6.0 A max Anode input power . 60 kW max Anode dissipation . 30 kW max Grid voltage d.c. . . –1000 V max Grid current d.c. (see note 4) 1.0 A max Grid dissipation . . 500 W max Cathode current d.c. . 7.0 A max Typical Operating Conditions of 3CW30000H3 Frequency . . 30 30 MHz Anode voltage d.c. . 7.0 10.0 kV Anode current d.c. . 6.0 6.0 A Anode dissipation . 12 18 kW Grid voltage d.c. . –600 –800 V Grid resistor . . 910 2540 Ω Grid current d.c. . . 660 315 mA Grid dissipation . . 290 113 W Drive power . . 660 365 W Anode input power . 42 60 kW Anode output power . 30 42 kW Output power less drive . 29.3 41.4 kW NOTES 1. The filament voltage measured at the tube should be 6.3 V ± 5% for satisfactory performance, maximum life is obtained at –5% (6.0 V). 2. The filament current of 3CW30000H3 must not exceed 800 A, even momentarily, at any time. 3. Maximum anode voltage and current should not be applied simultaneously; this could result in excessive anode dissipation. The anode supply should include current-limiting resistors, and an over-current trip to remove anode voltage quickly in the event of an overload or arc (such load variations and faults are common in industrial service). Spark gaps should be connected between anode and ground, to protect the tube from voltage transients under fault conditions. 4. The grid current rating of 1.0 A d.c. should not be exceeded, except for very short periods during tuning. Normally, reasonable efficiency can be obtained with a grid current not exceeding 0.4 to 0.6 A. The grid circuit should include over-current protection, and d.c. grid current should be monitored continuously during industrial operation with varying loads. |
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