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4CX1500B RADIAL BEAM POWER TETRODE TECHNICAL DATA J£DEC DESIGNATION 8660 The EIMAC 4CX1500B is a ceramic and metal, forced air cooled, radial beam tetrode with a rated maximum plate dissipation of 1500 Watts. It is a low vol tage, high-current tube specifically designed for exceptionally low intermodulation distortion and low grid interception. The low distortion characteristics make the 4CX1500B especially sui table for radio-frequency and audio-frequency linear amplifier service. GENERAL CHARACTERISTICS l ELECTRICAL Cathode: OXlde Coated, Unipotential Heating Time • • • . Heater: Voltage • • Current . . . . . . . . . . . Transconductance: (1=0.5 amperes, E 2=225 Volts) . • • Min. -3- Nom. Max. 6.0 9.0 11.0 Minutes Volts Amperes 30,000 Umhos Direct Interelectrode Capacitance (Grounded Cathode)2 88 Cin . . . . . . . . . . . . . . . 75 12.8 Cout • • • • • • • • • . • • • . 10.8 0.3 Cgp • • • • • . • • • pF pF pF Direct Interelectrode Capacitance (Grounded Grid and Screen)2 Cin . . . . . . . . . . . . . . . . . . . 38 Cout • • • • • • . • • . . • • • . • 12 Cgp. • • • • • • • . • • 0.005 pF pF pF lCharacteristics and operating values are based upon performance tests. These figures may change without notice as the result of addi tional data or product refinement. Varian EH1AC should be consulted before using this information for finil equipment design. 2capaci tance values shielded fixture. are for (Pub. 4940 Effective 9/15/86) a cold tube as measured in a special 2 4CX1500B l>1ECHAN I CAL Maximum Overall Dimensions: Length Diameter Net Weight • • . . • . Operating Position . . . . . . . . . . . . . . ..... 4.6 in 3.37 in 27 oz Any Maximum Operating Temperature: Ceramic to Metal Seals Anode Core • • Special, Breechblock Terminal Surfaces Base . • • • . • . Recommended Socket . . . . . . . . . . . • • En-me SK-800 Series RADIO FREQUENCY LINEAR AMPLIFIER Class AB MAXIMUM RATINGS: DC Plate Voltage DC Screen Voltage . DC plate Current Plate Dissipation • . Screen Dissipation Control Grid Dissipation 3000 Volts 400 Volts 0.900 Amperes 1500 Watts 12 Watts 1 Watt 4CX1500B 3 TYPICAL OPERATION (Frequencies Below 30 MHz) Class AB2 Grid Driven, Peak Envelope or Modulation Crest Conditions . · · · · · ·· · . . · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · DC Plate Voltage DC Screen Volta~e DC Grid voltage Zero-Signal DC Plate Current Single-Tone DC Plate Current Two-Tone DC Plate Current Single-Tone DC Grid Current Two-Tone DC Grid Current Single-Tone DC Screen Current Two-Tone DC Screen Current Peak rf Grid ¥oltage · Driving Power •.• Useful Output Power . · Resonant Load Impedance · ··· ·· · · · · · · · · · · · · · ·- ·· 2500 225 -34 300 720 530 1.3 0.06 -7 -11 46 1.5 900 1900 2750 225 -34 300 755 555 0.95 0.20 -14 -11 45 1.5 1100 1900 2'900 225 -34 300 710 542 0.53 0.06 -15 -11 41 1.5 1100 2200 Volts Watts Watts Ohms -38 -47 -40 -48 -43 -47 dB dB Volts Volts Volts rnA rnA rnA rnA rnA rnA rnA Intermodulation Distortion Products 3 3rd Order 5th Order . · · · · · · · ··· · · · lAdjust to the specified zero-signal plate current. 2The driving power specified includes 1000 ohm swamping resistor between cathode. the power dissipated in a the control grid and the 3The intermodulation distortion products will be as specified or better for all levels from zero-signal to maximum output power and are referenced against one tone of a two equal tone signal. 4CX1500B 4 AUDIO AMPLIFIER OR MODULATOR Class ABl MAXIMUM RATINGS: DC Plate Voltage DC Screen Voltage . DC Plate Current Plate Dissipation . Screen Dissipation Grid Dissipation . . .. .. . .. . . . . . . . . · . . . . . . . . . . ... .. 3000 Volts 400 Volts 900 Amperes 1500 Watts 12 Watts 1. 0 ~vatt TYPICAL OPERATION (Sinusoidal wave, two tubes unless noted) . · ·· ·· · · ·· ·· ·· ·· · ·· · · · · · · · ·· · · DC Plate Voltage DC Screen Volta~e . · · · DC Grid Voltage Zero-Signal DC Plate Current Max.-Signal DC Plate Current 2. Zero-Signal DC Screen Current Max.-Signal DC Screen Current 2 Effective Load, Plate to Plate Driving Power · Max.-Signal Plate Output Power . . NOTE: · 2900 Volts 2500 2000 325 325 Volts 325 Volts -60 -60 -60 500 rnA 500 500 1.69 1.69 Amperes 1.68 -25 -20 rnA -30 -32 rnA -33 -27 1948 2715 3333 Ohms · 16040 22580 27740 Watts vJatts · · · · · · · · · · · · · · · · · · · "TYPICAL OPERATION" data are obtained by calculation from the published characteristic curves and confirmed by direct tests. Ac.j ustment of the grid bias to obtain the specified zero-signal plate current is assumed. When grid drive is applied, the screen voltage required to obtain the specified value of plate current without drawing grid current may vary somewhat from the typical values shown. 5 4CX1500B APPLICATION COOLING The maximum temperature rating for the anode core of the 4CXl500B is 250 o C. Sufficient forced air circulation must be provided to keep the temperature of the anode at the base of the cooling fins and the temperature of the ceramic-to-metal seals to below 250 o C. Air flow requirements to maintain seal o temperature at 22S C in SOoC ambient air are tabulated below (for operation below 30 megahertz). Tube mounted in recommended socket and chimney. Sea Level Plate Dissipation watts 1000 1500 Air Flow CFM 18 34 10,000 feet Pressure Drop inches water Air Flow CFM .23 .60 24 45 Pressure Drop inches water .31 .SO ·Since the power d~sipated by the heater represents about 60 watts and Since grid plus screen dissipation can, under some conditions, represent another 13 watts, allowance has Oeen made in preparing this tabulation for an additional 73 watts dissipation. The blower selected in a given application must be capable of supplying the desired air flow at a back pressure equal to the pressure drop shown above plus any drop encountered in ducts and filters. At other altitudes and ambient temperatures, the flow rate must be modified to obtain equivalent cooling. The flow rate and corresponding pressure differential must be determined individually in such cases, using rated maximum temperatures as the criteria for satisfactory cooling. HEATER The rated heater voltage for the 4CXl500B is 6.0 Volts. The voltage, as measured at the socket should be maintained at this value to minimize variations in operation and to obtain maximum tube life. In no case should the voltage be allowed to exceed 5% above or below the rated value. The cathode and one side of the heater are internally connected. It is recommended that the heater voltage be applied for a period of not less than 3 minutes before other operating voltages are applied. From an initial cold condition, tube operation will stabilize after a period of approximately 5 minutes. 6 4CX1500B INTERMODULATION DISTORTION The Radio Frequency Linear Amplifier operating conditions including the distortion data are the resul ts of actual operation in a neutralized grid-driven amplifier. Plots of H1 distortion versus power output under two-tone conditions, as a function of zero-signal plate current, are included to illustrate the effect of this parameter upon distortion. Because the 4CX1500B has very low grid interception, it is possible to drive the grid positive without any adverse effects upon the distortion level or upon the driver. Class Ab 2 linear amplifier operation is therefore possible and recommended. It is also recommended that a low impedance driver be used and that the input of the 4CX1500B be swamped with a 1000 ohm resistor from grid to cathode so as to provide an almost constant load to the driver. CONTROL-GRID OPERATION The control gird dissipation rating of the 4Cx1500B is 1 Watt. The design features which make the 4CX1500B such an extremely linear tube also contribute to very low grid interception. It will be found that the grid will be driven into the positive grid region in the typical operation of the tube. The grid current will usually be less than 1.0 milliampere. SCREEN-GRID OPERATION 'retrode tubes may exhibi t reversed screen current to a greater or lesser degree depending on individual tube design. This characteristic is prominent in the 4CX1500B and, under some operating conditions, indicated negative screen currents in the order of 35 milliamperes may be encountered. The maximum rated power dissipation for the screen grid in the 4CX1500B is 12 Watts and the screen power should be kept below this level. The product of the peak screen voltage and the indicated dc screen current approximates the screen input power except when the screen current indication is near zero or negative. In the usual tetrode amplifier, where no signal voltage appears between cathode and screen, the peak screen voltage is equal to the dc screen voltage. Experience has shown that the screen will operate within the limits established for this tube if the indicated screen current, plate voltage and drive voltage approximate the "Typical Operation" values. The screen supply voltage must be maintained constant for any values of negative and positive screen currents that may be encountered. Dangerously high plate currents may flow if the screen power supply exhibits a rising voltage characteristic with nega ti ve screen current. Stabilization may be accomplished in several different wayS. A bleeder resistor may be connected form screen to cathode; a combination of VR tubes may be connected from screen to cathode; or an electron-tube regulator circuit may be used in the screen supply. It is absolutely essential to use a bleeder if a series electron-tube regulator is employed. The screen bleeder current should approximate 70 milliamperes to adequately stabilize the screen voltage. It should be observed that this bleeder power may be usefully employed to energize low-power stages of the transmitter. 4CX1500B 7 PLATE OPERATION The maximum rated plate dissipation power is 1500 Watts. Except for brief periods during circuit adjustments, this maximum value should not be exceeded. The top cap on the anode cooler may be used as a plate terminal at low frequencies or a circular clamp or spring-finger collet encircling the cylindrical outer surface of the anode cooler may be used at high frequencies. Points of electrical contact with the anode cooler should be kept clean and free of oxide to minimize radio-frequency losses. The anode cooler shoulc~ be inspected periodically and cleaned when necessary to remove any dirt which might interfere with effective cooling. SPECIAL APPLICATIONS If it is desired to operate this tube under conditions different frofl1 those given here, write to the Power Gr iG Tube r,~ark.eting Department, Varian EIJ:.1AC, 1678 South Pioneer Road, Salt Lak.e City, UT 84104, for information and recommendations. CAUTION-HIGH VOLTAGE Operating voltage for this tube can be o.eClcHy, so the equipment must be designed properly and operating precautions must be followed. Design equipment so that no one can come in contact with high voltages. All equipment must include safety enclosures for high voltage circuits and terminals, with inter lock swi tche s to open the priILIary circuits of the power supply and to discharge high voltage capacitors whenever access doors are opened. Interlock switches must not be bypassed or "cheated" to allow operation with access doors open. Always remember that HIGH VOLTAGE CAN KILL. I 1 EIMAC 4CXI500B EIMAC 4CX 1500B TYPICAL 1M PRODUCTS VS. POWER OUTPUT TYPICAL 1M PRODUCTS VS. POWER OUTPUT (AS A FUNCTION OF ZERO SIGNAL PLATE CUlRENT) (AS A FUNCTION OF ZERO SIGNAL PLATE CURRENT! ., ~ ~ ~ ~ I- ------- 0 3,d ORDER PRODUCTS l:l EO '2SOOVOLTS Ee2 '225 VOLTS R L' 1900 OHMS FI = 1.980 Me F 2'; 1.982 Me -10 ~ lIJ l- I'; ffi -30 -30 :t: I ........ > ,," , -50 If' , --.:. , -60 .. I Ibo'300 rnA" I -70 w m ," , m ~ -50 I " r, ,, ,I 8 60 8:- '=----:0 ........~ , -7(l 200 600 800 PEAK ENVELOPE POWER OUTPUT - WATTS 400 1000 1200 I I ... _1- loo '2:() :~ ... 1', ........ , '. 200 400 --_.. ~ ... " i--.......... IT 1000 800 600 ------- 5 th ORDER PRODUCTS ~ 8 Eb • 2750 VOLTS Ee 2 • 225 VOLTS RL '2200 OHMS F 1 =1.980MC F2 = 1.982N1c ------- ~ o 3,d ORDER PRODUCTS 51h ORDER PRODUCTS Ee2 .225 VOLTS Eb' 2900 VOLTS R L • 2200 OHMS F 1=1.980 Me F2 = 1.982 Me ( -10 Z iii I I ~ -20 .... -20 I'; I'; 0: 0: i '"~ -30 -30 I oo '250mA I- W 3 ~ -40 -.. m ~ (/) -50 ~ I (AS A FUNCTION OF ZERO SIGNAL PLATE CURRENT) 3,d ORDER PRODUCTS l- ~ I 1 EIMAC 4CXI500B TYPICAL 1M PRODUCTS VS POWER OUTPUT .,~ o 3 1400 1200 PEAK ENVELOPE POWER OUTPUT- WATTS (AS A FUNCTION OF ZERO SIGNAL PLATE CURRENT) ~ -10 ... ........ Ioo '300mA 1 ~ I ;' ,.' ....... I EIMAC 4CX I500B TYPICAL 1M PRO[)JCTS VS. POIIER OUTPUT o - I bo '300mA ' -,,,,'" o 1400 IOO' 250mA I I o --- -- , '~:: " ,'1 ~ I '" " ~.:: , ~ ,":.'":......I~=250mA,' , " ........ ~ ~-40 ...... I ?OO' 3OOmA , o o W I oo'250mA ............ ~ --r-- I- - ulm 40 g: -10 '"~ -20 -20 ~ ~ 5 It> ORDER PRODUCTS Eb • 2750 VOLTS Ee 2' 225 VOLTS R L' 19000HMS FI =1.980 Me F2 = 1.982 Me -' 0: W 3,d ORDER PRODUCTS '";: I'; '"~ ------- o 5th ORDER PRODUCTS I -60 ,,.' ... ... ' -....... --- -- -+- ~~ -40 IOO' 3OOmA ''''Ii::t~~ I oo '250mA '" -50 ,~ t; :::::::.:t--r -- --' I I if-60 loo'300mA ~ -70 o 200 400 600 800 PEAK ENVELOPE POWER OUTPUT- WATTS ,," 8" 1000 1200 .. --.. .............. r- __ ..... ... --- U'I o o r--,. -~ I:IIlI l bo .250:t ....... , ~ "', -' .... - . . . r ~ // , ; l oo '300mA -70 1400 ...>< ~'300mA I ~ .- ... " :::::...r--. n I I !1: ~ .Ilo Ibo '250mA W o ,- 200 .. 400 600 - ........ 800 - L-_l ___L PEAK ENVELOPE POWER Ol.hPUT - WATTS 1000 1200 1400 I , , 100 l' ~- ~~~- ~'">~~'""~"'~Y'~"~~"'~ !t I' t , ' rI ", " ! .. t ~..'~~_•. _.J~ -····-~··:··~··~I. ; , 75 I .. I 1 j .." . _ •.}.. .. 20A il~ EIMAC 4CX1500B I 10. t, : . I "T.'. "-.:--". • ;;,-r;"~ ' -.D5~ I ' ' ... . TYPICAL CONSTANT CURRENT CHARACTERISTICS "-..,:. .-....... . ,. . ~·. ~·;·~~. ·~.r·1................~.... - 1...... ;..0, <t~"" ....... , I _D.:.~.. <!': /~-.~~1 :J.o;; . . . V" ,; .' , " , - .--- ... I ' I , tiCREEN VOLTAGE - 225 VOLTS PLATE CURRENT - AMPERES I .. :. - - - - SCREEN CURRENT - AMPERES I I . • '. "91';". .! '. I . 5 /;••r .. .-Jr..~~-;r;~"i L..Ll~~-:..~J_~.,_~~ __~-+-" 50 .b..-... t--. -t-., -,$3A. -:S.' :-.~:::.~":......-~;~+~~j...~~. • . ~. '.' / . .• /'./;+,10 I ' \. "-. . . I -j~"-'-I -·l~~:=t~=~·~ =-~T~-~~~~~=:,=:·~::~-·-" .. 25 en ..... -' 0 0 -::> <.J LU -25 -50 -75 I '1.' "" 1 • < 4 ,t· ",' - yoj. '~··~.·-;-I .001 ~ !. -100 I .1 ;, n -'" ,, . >< 0 0 DCI -125 2 0 Eb/KILOVOL TS 3 ~ I I 100 EIMAC 4CX1500B .40 75 /' ./' 50 . # I _ ." o ; I-' - I ~ , /' ' /. . /- # ' , ' K / //" ./.~ /'. /.. ' : ,e' /., \. . • - . - ' :,.~', : - . .... " I. ...... ,,' I' , i;} --.J... / ! o o OJ ..... 5.0 ; 4.0 k ' ./; -=-.. l...-.-....;..- ......;..~... ----·... -.-~..............,"'--~---O. . ' I 3.0 ..; 2.0 t; -25 >< UI . _ .... c .......... ;;.;,;;,.-.-':'.-:-.~ .... . 0I:loo n PLATE CURRENT - AMPERES SCREEN CURRENT - AMPERES 0" ~ ~ SCREEN VOLTAGE - 325 VOLTS I~., •I I• • I. I •I ~~ ...... .: I' .-. '-' L.L.I # _L - ~ '~~'- ~ -'-'1'---'" - -~---- -~, -- - - - -. -- --- -.0. 05 t' _.' - -- - -,I. /' -- :/' " '\ .' ""'''; .'. )'; ~ /; ~ • / /. ,/ . , '05 /' ----1--~ ""'.;-.~_,.·7L. I ..I ;' o > ....... - .,./ • ~/ l - /. ."" ". <#.. It« /.. .~ CI) ,/ / # r_ • -'; . -.05 ;JO~ /./ ~ ./ / : /: / . / . ....::::::.::. .... .,............. ·'...... -r· ... - ... ~-""- ....... ."....-- ...... - ...... --"OlO « ~. 25 , /. • I .20 / / / " / TYPICAL CONSTANT CURRENT CHARACTERISTICS .....:.. ...... .,.. . ..-.1.0 ' ,-. --,--------------"-------- //~/;c. .,.. -50 , -75 IT'~·~.'___r~~LTT---~---r-~~~---I~------- ,". .," ./' _.-.. '" ' _ . _ . ;: # , I /' ...... ........ t , ==4= =,;._ i -Id I I 1'- -100 1 ·1,· t · I ' -r-;-,·:":",:;r'--~~ I ' I --C---T--+ -,I---c~+---;C-+-T--j ' I : I . . '" .0011 -125 o 2 Eb/KILOVOLTS 3