TECHICAL DATA RADIAL BEAM PER PETDE The EIMAC 5CX1500A s a ceramc metal power pentode desgned for use as a Class AB1 lnear amplfer n audo or rado frequency applcatons. Its characterstc low ntermodulaton dstorton makes t especally sutable for sngle sdeband servce. The flament s a rugged mesh type. The tube s also recommended for use as a Class C rf power amplfer n C, FM and AM servce. GEERAL CHARACTERISTICS1 ELECTRICAL Flament: Thorated Tungsten Voltage 5.0 ± 0.25 V Current, at 5.0 volts 38.5 A Transconductance (Average): Ib = 1.0 Adc, E c2 = 500 24,000 µmhos Amplfcaton Factor (Average): Grd to Screen 5.5 Drect Interelectrode Capactance (grounded cathode)2 Input utput Feedback Frequency of Maxmum Ratng: C 75 pf... 16.5 pf 0.20 pf 110 MHz 1. Characterstcs and operatng values are based upon performance tests. These fgures may change wthout notce as the result of addtonal data or product refnement. EIMAC Dvson of Varan should be consulted before usng ths nformaton for fnal equpment desgn. 2. Capactance values are for a cold tube as measured n a specal shelded fxture. MECHAICAL Maxmum verall Dmensons: Length.. 5.150 n;130.81 mm Dameter 3.370 n; 85.60 mm et eght 30 oz; 850.5 gm peratng Poston Axs vertcal, base down or up Maxmum peratng Temperature: Ceramc Metal Seals 250 C Anode Core 250 C (Revsed 11-15-75) 1965,1967,1970,1975 by Varan Prnted n U.S.A. EIMAC dvson of varan 301 ndustral way san carlos calforna 94070
5CX15 00A Coolng Forced Ar Base Specal rng and breechblock termnal surfaces Recommended Ar System Socket EIMAC SK -840 seres Recommended (Ar) Chmney EIMAC SK -806 RADI FREQUECY LIEAR AMPLIFIER GRID DRIVE Class AB1 TYPICAL PERATI (Frequences to 30 MHz) Class AB1, Grd Drven ABSLUTE MAXIMUM RATIGS: Plate Voltage 2500 3000 4000 DC PLATE VLTAGE 4000 VLTS Suppressor Voltage 0 0 0 DC SCREE VLTAGE 750 VLTS Screen Voltage 500 500 500 DC PLATE CURRET 1.0 Grd Voltage 1-87 -89-90 AMPERE. Zero -Sgnal Plate Current 250 250 250 PLATE DISSIPATI 1500' -ATTS Sngle -Tone Plate Current... 660 690 690 SUPPRESSR DISSIPATI 25 ATTS Two -Tone Plate Current 470 480 485 SCREE DISSIPATI 75 ATTS Sngle -Tone Screen Current3.. 79 71 59 GRID DISSIPATI 25 ATTS Two -Tone Screen Current3... 36 32 25 Peak rf Grd Voltage 3 87 89 90 v Peak Drvng Power3 0 0 0 w Sngle -Tone Useful 1. Adjust to specfed zero -sgnal dc plate current. utput Power 1090 1330 1785 2. The ntermodulaton dstorton products are refer- Resonant Load Impedance.... 2340 2680 3500 Sl enced aganst one tone of a two equal tone sgnal. Intermodulaton Dstorton Products2 3. Approxmate values. 3rd rder -38-36 -33 db 5th rder -39-41 -42 db RADI FREQUECY PER AMPLIFIER R SCILLATR Class C Telegraphy or FM (Key -Down Condtons) ABSLUTE MAXIMUM RATIGS DC PLATE VLTAGE DC SCREE VLTAGE DC PLATE CURRET PLATE DISSIPATI SUPPRESSR DISSIPATI SCREE DISSIPATI GRID DISSIPATI 5000 VLTS 750 VLTS 1.0 AMPERE 1500 ATTS 25 ATTS 75 ATTS 25 ATTS TYPICAL PERATI (Frequences to 30 MHz) Plate Voltage 3000 4000 Suppressor Voltage 0 0 Screen Voltage 500 500 Grd Voltage -200-200 Plate Current 900 800 Screen Currentl 94 66 Grd Currentl 35 25 Peak rf Grd Voltagel 255 245 Calculated Drvng Power 9.0 6.5 Plate Input Power 2700 3200 Plate Dsspaton 720 850 Plate utput Power 1980 2350 Resonant Load Impedance 1570 2240 1. Approxmate value. 4500 0 500-200 900 88 34 255 9.0 4050 870 3180 2520 v Sl PLATE MDULATED RADI FREQUECY PER AMPLIFIER-GRID DRIVE Class C Telephony (Carrer Condtons) ABSLUTE MAXIMUM RATIGS DC PLATE VLTAGE 3500 VLTS DC SCREE VLTAGE 550 VLTS DC PLATE CURRET 0.8 AMPERE PLATE DISSIPATI 1 1 000 ATTS SUPPRESSR DISSIPATI 25 ATTS SCREE DISSIPATI2. 75 ATTS GRID DISSIPATI2 25 ATTS 1. Corresponds to 1 500 watts at 1 00% sne -wave mod - ulaton. 2. Average, wth or wthout modulaton. TYPICAL PERATI (Frequences to 30 MHz) Plate Voltage 2500 Suppressor Voltage 0 Screen Voltage 500 Grd Voltage -260 Plate Current 800 Screen Currentl 90 Grd Currentl 32 Peak of Screen Voltagel (100% modulaton) 500 Peak rf Grd Voltage 1 31 5 Calculated Drvng Power 10 Plate Input Power 2000 Plate Dsspaton 530 Plate utput Power 1470 Resonant Load Impedance 1360 1. Approxmate value. 3200 0 500-260 800 86 32 500 315 10 2560 576 1958 1863 v v S2 2
AUDI FREQUECY PER AMPLIFIER R TYPICAL PERATI Two Tubes) MDULATR Class AB, Grd Drven (Snusodal ave) Plate Voltage 2800 3800 Suppressor Voltage 0 0 ABSLUTE MAXIMUM RATIGS (per tube) Screen Voltage 500 500 Grd Voltage -81-83 Zero -Sgnal Plate Current 0.50 DC PLATE VLTAGE 4000 0.50 Adc VLTS Max. Sgnal Plate Current 1.30 1.33 Adc DC SCREE VLTAGE 750 VLTS Zero -Sgnal Screen Current 20 20 DC PLATE CURRET 1.0 AMPERE Max. Sgnal Screen Current 110 106 PLATE DISSIPATI 1500 ATTS Peak of Grd Voltage 81 83 v Peak Drvng Power 0 0 w SUPPRESSR DISSIPATI 25 ATTS Max. Sgnal Plate Dsspaton. 720 1130 SCREE DISSIPATI 75 ATTS Plate utput Power 2200 3220 GRID DISSIPATI 25 ATTS Load Resstance(plate to plate)... 4800 6720 Ç1 1. Approxmate value. 2. Per tube. 3. omnal drve power s one -half peak power. 4. Adjust to gve stated zero -sgnal plate current. TE: TYPICAL PERATI data are obtaned from drect measurement or by calculaton from publshed characterstc curves. Adjustment of the rf grd voltage to obtan the specfed plate current at the specfed bas, screen and plate voltages s assumed. If ths procedure s followed, there wll be lttle varaton n output power when the tube s changed, even though there may be some varaton n grd and screen current. The grd and screen currents whch result when the desred plate current s obtaned are ncdental and vary from tube to tube. These current varatons cause no dffculty so long as the crcut mantans the correct voltage n the presence of the varatons n current. In the case of Class C Servce, f grd bas s obtaned prncpally by means of a gr d resstor, the resstor must be adjustable to obtan the requred bas voltage when the correct rf grd voltage s appled. RAGE VALUES FR EQUIPMET DESIG Mn. Max. Flament: Current at 5.0 volts 36.5 40.5 A Interelectrode Capactancesl(grounded cathode connecton) Input 70 80 pf utput 14.5 18.5 pf Feedback - -- 0.25 pf Interelectrode Capactances (grounded grd connecton) Input 32 37 pf utput 14.5 18.5 pf Feedback - -- 0.05 pf APPLICATI MECHAICAL MUTIG - The 5CX1500A must be operated wth ts axs vertcal. The base of the tube may be down or up at the convenence of the crcut desgner. SCKET - The EIMAC SK -840 socket and SK -806 chmney have been desgned especally for the 5CX1500A. The use of recommended arflow rates through these sockets provdes effectve forced -ar coolng of the tube. Ar forced nto the bottom of the socket passes over the tube termnals through the Ar Chmney, and exts through the anode coolng fns. 3
CLIG - The maxmum temperature ratng for the anode core of the 5CX1500A s 250 C. Suffcent forced -ar crculaton must be provded to keep the temperature of the anode at the base of the coolng fns and the temperature of the ceramc meta 1 seals below 250 C. Ar -flow requrements to mantan seal temperature at 225 C n 50 C ambent ar are tabulated below (for operaton below 30 MHz). PLATE DISSIPATI (ATTS) 1000 1500 AIR FL (CFM) 27 47 SEA LEVEL PRESSURE DRP (ICHES of ATER ).33.76 6000 FEET AIRFL (CFM) 33 1,8 PRESSURE DRP (ICHES of ATER) * Snce the power dsspated by the flament represents about 200 watts and snce grd -plus- screen -plus- suppressor dsspaton can, under some condtons, represent another 125 watts, allowance has been made n preparng ths tabulaton for an addtonal 325 watts dsspaton. The blower selected n a gven applcaton must be capable of supplyng the desred ar flow at a back pressure equal to the pressure drop shown above plus any drop encountered n ducts and flters. At other alttudes and ambent temperatures the flow rate must be modfed to obtan equvalent coolng. The flow rate and correspondng pressure dfferental must be determned ndvdually n such cases, usng rated maxmum temperatures as the crtera for satsfactory coolng. ELECTRICAL FILAMET PERATI - The rated flament voltage for the 5CX1500A s 5.0 volts. Flament voltage, as measured at the socket, should be mantaned wthn ±5% of ths value or below to obtan maxmum tube lfe. ITERMDULATI DISTRTI - The Rado Frequency Lnear Amplfer operatng condtons ncludng dstorton data are the results of operaton n a neutralzed, grd- drven amplfer. Plots of IM dstorton versus power output under two -tone condton for a typcal tube are shown on next page. GRID PERATI - The rated dsspaton of the grd s 25 watts. Ths s approxmately the.40.95 product of dc grd current and peak postve grd voltage. peraton at bas and drve levels near those lsted wll nsure safe operaton. SCREE PERATI - The power dsspated by the screen of the 5CX1500A must not exceed 75 watts. Screen dsspaton, n cases where there s no ac appled to the screen, s the smple product of the screen voltage and the screen current. If the screen voltage s modulated, the screen dsspaton wll depend upon rms screen current and voltage. Screen dsspaton s lkely to rse to excessve values when the plate voltage, bas voltage, or plate load are removed wth flament and screen voltages appled. Sutable protectve means must be provded to lmt the screen dsspaton to 75 watts n the event of crcut falure. SUPPRESSR PERATI - The rated dsspaton of the suppressor s 25 watts. Suppressor current wll be zero or very nearly zero for all typcal operatng condtons specfed. The 5CX1500A has been desgned for zero voltage operaton of the suppressor grd for most applcatons. PLATE DISSIPATI - The plate- dsspaton ratngs for the 5CX1500A s 1000 watts for Class -C plate- modulated servce and 1500 watts for Class -C telegraphy. In Class -AB servce the plate dsspaton ratng s 1500 watts. HIGH VLTAGE - The 5CX1500A operates at voltages whch can be deadly, and the equpment must be desgned properly and operatng precautons must be followed. Equpment must be desgned so that no one can come n contact wth hgh voltages. All equpment must nclude safety enclosures for hgh- voltage crcuts and termnals, wth nterlock swtches to open the prmary crcuts of the power supples and to dscharge hgh voltage condensers whenever access doors are opened. Interlock swtches must not be bypassed or "cheated" to allow operaton wth access doors open. Always remember that HIGH VLTAGE CA KILL. SPECIAL APPLICATIS - If t s desred to operate ths tube under condtons wdely dfferent from those gven here wrte to the Power Grd Tube Dvson, EIMAC Dvson of Varan, 301 Industral ay, San Carlos, Calforna 94070, for nformaton and recommendatons. 4
0 db -10 db -20 db EIMAC 5CX 1500A IM PRDUCTS vs PER UTPUT (AS A FUCTI F ZER-SIGAL PLATE CURRET) 3rd rder Products 5th rder Products Eb = 4000 VLTS, Ec2 = 500 VLTS Ec3 = 0 VLTS. RL= 3500 HMS FI = 1.980 Mc, F2 = 1.982 Mc Ibo = 200-30 db Ibo = 250-40 db -50 db Ibo = 300 2rrr rr r 43-60 db % - 70 db j 0 500 1000 1500 2000 2500 PER UTPUT (PEP) -ATTS 0 db -10 db -20 db EIMAC 5CX 1500A IM PRDUCTS vs PER UTPUT (AS A FUCTI F ZER -SIGAL PLATE CURRET) 3rd rder Products - 5th rder Products Eb = 4000 VLTS. Ec2 = 600 VLTS Ec3 = 0 VLTS, RL= 2800 HMS Fl = 1.980 Mc, F2 = 1.982 Mc Ibo = 200-30 db ' -40 db -50 db ' Ibo = 250 ' Ibo = 300 '' r r' -'...... 200...' I.'. rr rr 250 _... rrr ' ' rr rrr rrr`' r ' r srr r r rrr r'r rr rr r rr r r -60 db rr rrrr rr % r r -70 db r % % 0 500 1000 1500 2000 2500 5 PER UTPUT (PEP) -ATTS rrr
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CTACT SURFACES SUPPRESSR SCREE CTRL - HEATER 8 CATHDE HEATER 7 DIMESIAL DATA ICHES MILLIMETERS DIM. MI. MAX. REF MI. MAX. REF A 3.335 3.370 - - 84.71 85.60 - - B 0.807 0.820 - - 20.50 20.83 - - C 1.870 1.900 - - 47.50 48.26 - - D 2.250DIA2.300DIA - - 5715 DIA 58.4201A - - E 2.335 2.535 - - 59.31 64.39 - - F 3.530. 3.730 - - 89.66 94.74 - - G 4.900 5.150 - - 24.46 130.81 - - H 0.965 0.988 - - 24.51 25.09 - - J 0.690 0.710 - - 17.53 18.03 - - K 0.415 0.435 - - 10.54 11.05 - - L 0.140 - - - - 3.56 -. - - - M 0.020 0.030 - - 0.51 0.76 - - 0.700 0.800 - - 1778 20.32 - - P Q314 DIA. 0326 DA. - - 798 DIA. 8.28 DIA - - R 55 65 - - 55 65 - - S 115 125 - - 115 125 - - T 0.470 0530 - - 11.94 1346 - - 2.468 2531 - - 62.69 64.29 - - X 1.225 1275 - - 31.12 32.39 - - C VET HLE LCATIS T CRITICAL