Svetiana 4CX5000A/8170 Radial Beam Power Tetrode Ug Ta Ug Oa Uy TAU Catan UU 0 j \ | ham rah nN PULLS he Svetlana 4CX5000A/8170 is designed for audio and radio frequency applications. It is particularly well-suited for use in VHF EM broadcast transmitters in the Band II 88-108 MHz frequency range. The Svetlana 4CX5000A/ 8170 has a directly-heated thoriated tungsten mesh filament for mechanical ruggedness and good VHF electrical performance. This modern mesh filament design is superior to the old hairpin design of the 1950's. In some VHF applications, the input circuit may need to be re-tuned to use the Svetlana 4CX5000A/8170 as a replacement. The Svetlana 4CX5000A/8170 is manufactured in the Svetlana factory in St. Petersburg, Russia, and is designed to be a direct replacement for the 4CX5000A/8170 manufactured in the United States, England and elsewhere. Svetl ana ELECTRON DEVICES tats ni nt mn NNSS Svetiana 4CX5000A/8170 > J, |= =e | SS a 4 oe acc [ante TT Nt i i iat interelectrode capacitances (grounded grid): ae 45 i Ci 56 pF q Nee oe ail 21.5 = Cpk 0.1 pF q aq aq meat frequency for full ratings (CW) 110 iz , Mechanical q = Sy Maximum overall dimensions: Length 23.18 cm (9.13 in.) 4 Diameter 12.54 cm (4.94 in.) Net weight 4.3 kg (9.5 Ib) 4 _ Operating position Axis vertical, base up or down x Maximum operating temperature, ceramic/metal seals or envelope 250 C aq ay Coolin Forced ai a _ Base 7 Coaxial, designed for use with SK300 ies ae i Chimney SK306 or SK356 q Radio Frequency Power Amplifier Class FM Absolute maxi ti q = sCuawvolage = 7500 V > DC screen voltage 1500 V DC grid volt -500 V he bem Se re fate dissipatl 5 = = a = Grid dissipation 75 W B lnm oem Typical Operation (Fi ies to 110 MH. Nise bee! crac _ _ aq aq DC screen voltage 750 V D = tame DC grid voltage -350 V DC plat t 2.3 A ON eee bem D0 screen corn a2 i aq am DC grid . 0.05 a area ag power 100 : Useful output 10 kw BN aoorontnae vas I SS D 2 bee bem Sp mae eee sage SaRadial Beam Power Tetrode Palte Modulated RF Power Amplifier, Grid Driven, Class C Telephony - Carrier Conditions Absolute maximum ratings ., DC plate voltage * vn a ea SOO Tv De screen voltage : ae = TT 000 EV DC grid voltage ~500 V DC plate current 2.5 A Plate dissipation 3.5 kW Screen dissipation 250 W Grid dissipation 75 W Typical Operation OC plate voltage 5000 V DC screen voltage 500 V Peak AF screen valtage (100% mod.) 450 V DE grid bias voltage -400 V DC plate current 1.4 A DC screen current* 0.26 A DC grid current* 0.05 A Peak rf grid voltage 520 Vv Grid driving power (calculated) 25 W Plate dissipation 1200 Ww Plate output power 5800 Ww Audio Frequency Power Amplifier or Modulator, Grid Driven, Class AB, Absolute maximum ratings OC plate voltage 7500 V DC screen voltage 1500 V DC plate current 4.0 A Plate dissipation 6000 W Screen dissipation 250 WwW Grid dissipation 75 Ww Typical Operation (two tubes, sinusoidal waveform) DC plate voltage 5000 7000 V we DC screen voltage 1250 1250 V DC grid voltage** -280 -325 V Zero-signal plate current 7.0 0.70 A Maximum signal plate current 4.40 3.65 A Maximum signal screen current* O33. 0.24 A Peak AF grid voltage 240 235 V Driving power 0 0 Ww Load resistance plate-to-plate 2870 4100 Ohms Maximum signal plate dissipation 4200 4200 Ww Plate output power - 13.8 17.6 kW * Approximate values ** Adjust for specified zero-signal plate currentTVA TATU a Ta Ua Ta Ua Ca Ty Ta Ua Ua Ca ea Ca aaa UU eee eA AAA eee ee a ess Tp Ua Ta Ua ta a Ug Ta Ua Ta Ua a Svetiana 4CX5000A/81 70 RF Linear Amplifier, Grid Driven, Class- AB, Absolute Maximum Ratings 7500 DC plate voltage V 7 DC screen voltage >. 1600 | V OC plate current 40 A Plate dissipation 6000 Ww Screen dissipation 250 W Grid dissipation 75 W Typical Gperation (Frequencies to 110 MHz) DC plate voltage 7500 V DC screen voltage 1250 VY DC grid voltage * -300 Vv Zero-signal DC plate current 0.5 A Single-tone DC plate current 1.90 A Single-tone DC screen current 0.20 A Peak RF grid voltage* 300 V Plate dissipation 4200 W 10 kW Single-tone plate output power * Approximate values ** Adjust for specified zero-signal plate current Electrical Application Plate operation The rated maximum plate dissipation of the tube is 6 kilo- watts. This power may be safely sus- tained with adequate air cooling. The tube must be protected from damage which may be caused by an internal arc occurring at high plate voltage. A protective resistance should always be connected in series with each tube anode to help absorb power-supply stored energy if an internal arc should occur. Control-grid operation The maximum control grid dissipation is 75 Watts, determined (approximately) by the product of the dc grid current and the peak positive grid voltage. Screen-grid operation The maximum screen grid dissipation is 250 Watts. With no ac applied to the screen grid, dissipation is the product of de screen voltage and the de screen current. Plate voltage, plate loading or bias voltage must never be removed while filament and screen voltages are present. Filament operation Svetlana recommends that a new tube, or a tube which has been in storage for some period of time, be oper- ated with only filament voltage applied for a period of from 30 to 60 minutes before full operation begins. Once normal opera- tion has been established, a minimum filament warm-up time of four to five seconds is sufficient for full filament emission. Filament voltage should be measured at the socket. At rated nominal filament voltage, the peak emission capability of the tube is many times that needed for communication service. A reduction in filament voltage will lower the filament temperature, and this reduction will substantially increase life expectancy. The correct value of filament voltage should be determined for the particular application. Svetlana recom- mends that the tube be operated at full nominal voltage for an initial stabilization period of 100 to 200 hours before any action is taken to operate at reduced voltage. The voltage should gradually be reduced until there is a slight degradation in performancesuch as power output or distortion. The voltage should then be increased a few tenths of a Volt above the value where performance degradation was first noted. The operating point should be rechecked after 24 hours.Radial Beam Power Tetrode " Svetlana 40X5000A/8176 Outline Brawi l : A Pt Ey - SA ~~. Air Oo Mot Contact nO . T t Screen Grid L f Control Grid | A Lr 1 | L i | c 1 7 Filament | o wil \ do Not Contact tE--~ F * Contact surface G Mechanical Application Mounting The Svetlana 4CXSO00A/ 8170 must be mounted vertically, base up or down. The tube should be protected from vibration and shock. Storage If the 4CX5000A/8170 is to be stored as a spare, it should be kept in its original packaging to minimize the possibility of handling damage. Cooling The 4CX5000A/8170 requires forced-air cooling in all applications. The tube socket should be mounted in a pressurized compartment so that the cooling air passes through the socket and is guided to the anode cooling fins by an air chimney. If cooling air is not passed around the base of the tube and through the socket, arrangements must be made to assure adequate cooling of the tube base and socket contacts. Adequate movement of cooling air around the base of the tube keeps the tube base and the socket contact fingers at a safe operating temperature. Although the maximum temperature rating for seals and the anode core is 250 C, good engineering practice requires that a safety factor be allowed. The table shows cooling parameters with the cooling air at 50 C and maximum tube anode temperature of 200 C. The figures are for the tube with air passing in a base- to-anode direction. Pressure drop values shown are approximate and are for the tube/socket/chimney combination. Inches Max: Millimeters Min... Max. 1422.22. 125.43 Minimum Cooling Air-Flow Requirements Sea Level Plate dissipation | Air flow Pressure drop (Watts) (CFM) | (Inches of water) 2000 75 0.4 4000 145 1.1 6000 230 2.0 At altitudes significantly above sea level, the flow rate must be increased for equivalent cooling. At 5,000 feet above sea level, both the flow rate and the pressure drop should be increased by a factor of 1.20, while at 10,000 feet both flow rate and pressure drop must be increased by 1.46. Special applications If the user needs to operate this tube under conditions widely different from those given in this publica- tion, contact any location of Svetlana Electron Devices for technical assistance.GRID VOLTAGE (VOLTS) 400 300 Ro oS 100 -100 -200 -300 2000 Svetlana 4C0X5000A/8170 Typical Constant Current Charicteristics Screen voltage 500 Volts Plate Current - Amperes. Screen Current - Amperes === 5"*% Grid Current -Amperes 4000 6000 8000 19 000. PLATE VOLTAGE (VOLTS)GRID VOLTAGE (VOLTS) 100 -100 -200 -300 -400 -500 2000 Svetlana 4CX5000A/8170 . Typical Constant Current Charicteristics Screen voltage 1250 Volts Plate Current- Amperes ~ Screen Current - Amperes. Grid Current - Amperes - 4000 6000 8000 _ 10,000 PLATE VOLTAGE (VOLTS)