AX3150C

CO vimag AX3150CJ HIGH POWER TRIODE The AX3150CJ is a high power metal ceramic triode, intended for use in HF industrial generators for frequencies up to 100 MHz and output power up to 240 kW. Cooling is accomplished by water. GENERAL DATA Electrical Filament: Thoriated tungstenum direct heating Voltage (see note 1) Current Vf If p 15 255 22 V A Characteristics Amplification Factor atVa= 14 to 12kV;la=8A Transconductance at Va= 12 kV; a = 6 to 8 A Direct interelectrode capacitances Grid-Anode Grid-Cathode Anode-Cathode S 95 66 170 4,5 mA/V pF pF pF Mechanical Overall dimensions Length Diameter See mechanical outline drawing Approximative weight Mounting position Cooling type 491 220 20 mm mm kg ' .Vertical, with anode up or down (see cooling characteristics) Water COVIMAG Z.I. La Marquisie Avenue du 4 juillet 1776 19101 BRIVE Cedex Tel: (33) 555.86.49.50 Marcia 23, 2004 " Page- I AX3150CJ Accessories Internal cathode terminal External cathode terminal Cathode connecting strip (2 per tube) Grid terminal for f< 10 MHz Grid terminal for f> 10 MHz Handle Water connector (2 per tube) Ref. 8311 Ref. 8311 Ref. 8311 Ref. 8311 Ref. 8311 Ref. 8311 Ref. 8311 219 219 219 219 219 219 219 25801 26001 25201 19401 25601 26201 26801 Cooling To obtain optimum life, the seal/envelope temperature under normal operating conditions should be kept below 220 °C at any point. Additional cooling by an air flow rate of approximately 3 m3/min, channeled on the tube terminal side is therefore required. The cooling water diagram applies to water inlet temperature tl = 35 °C (100 kPa = 1 atm = 1 bar). If the tube is mounted in normal position (anode down), water in the anode cooling jacket has to flow in the arrow-marked direction. If the tube is mounted in reverse position (anode up), input and output water connections should be reversed. Note 1 The cathodes consist of thoriated tungsten and are directly heated. No RF voltage is permitted between the two heater terminals of the tube since this would result in an additional heating of the cathode. For this reason, a capacitive bridging of the cathode is generally required. To reduce resonance effects, a low-ohmic resistor should be provided at the heater terminals. Heater voltage The heating power is primarily determined by the heater voltage applied to the cathode. The rated heater voltage is the maximum voltage required by a new tube to supply its rated output power. I COVIMAG Z.I. La Marquisie Avenue du 4 juillet 1776 19101 BRIVE Cedex Tel: (33) 555.86.49.50 March 23, 2001 Page - 2 AX3150CJ During operation, the heater voltage value should be kept as precisely as possible; the utmost average deviation from the rated value may only amount to +1 % or -3%. Temporary deviations between +5 and -10% are permitted. Since higher voltage variations may occur in industrial power systems, stabilization of the heater voltage will usually be necessary. The heater voltage should be set by means of an rms voltmeter, such as a moving iron meter of 0.5% accuracy, with the measurements being directly carried out at the cathode terminals. An inaccurately set heater voltage has - due to physical principles - the following effects : on the one hand, the cathode service life is shortened by overheating, while underheating, on the other hand, reduces the emission capability and thereby the possible peak cathode current, thus causing a power decrease. Heater current The heater current of a new tube may deviate from the rated value within a set tolerance range. During service life decarburization of the cathode thoriated tungsten filaments causes an increasing heater current which may exceed the initial value by up to 15 %. This has to be considered when dimensioning the heater transformer. OSCILLATOR FOR INDUSTRIAL APPLICATION (Anode voltage from three-phase bridge rectifier) Maximum ratings Frequency DC anode voltage DC grid voltage DC cathode current Peak cathode current DC grid current No load DC grid current Anode dissipation Grid dissipation Grid resistor at blocked tube f Va Vg Ik Ikp Ig Ignl Wa Wg Rgc 30 15 -2 30 140 4 5 100 2 5 MHz kV kV A A A A kW kW kQ COVIMAG Z.I. La Marquisie Avenue du 4 juillet 1776 March 23, 2001 19101 BRIVE Cedex Tel: (33) 555.86.49.50 Page - 3 AX3150CJ OPERATING CHARACTERISTICS Frequency Output power (see note 2) DC anode voltage DC grid voltage Peak RF grid voltage Feedback factor DC anode current DC grid current Grid resistor Anode input power Drive power Anode dissipation Grid dissipation Oscillator efficiency Anode load resistor