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It provides filament voltage/current, amplification factor, interelectrode capacitances, base and socket recommendations, temperature limits, mounting orientation, cooling notes, and detailed maximum ratings and typical two-tone modulation operation data at 30 Mc.",{"@graph":14,"@context":71},[15,34,54],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/zero-bias-power-triode-572-b-tube-features-and-ratings-data/672602/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":48,"encodingFormat":47,"isAccessibleForFree":49,"interactionStatistic":50},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/zero-bias-power-triode-572-b-tube-features-and-ratings-data/672602.png","ImageObject",300,407,{"name":42,"@type":43},"658056","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-02",true,{"@type":51,"interactionType":52,"userInteractionCount":22},"InteractionCounter",{"@type":53},"ViewAction",{"@type":55,"mainEntity":56},"FAQPage",[57,63,67],{"name":58,"@type":59,"acceptedAnswer":60},"What capability does the 572-B triode offer when used in parallel?","Question",{"text":61,"@type":62},"The sheet states that two 572-B tubes in parallel will permit 1 kW input.","Answer",{"name":64,"@type":59,"acceptedAnswer":65},"What are the key electrical characteristics listed for the 572-B?",{"text":66,"@type":62},"It lists a filament voltage of 6.3 volts, filament current of 4.0 amps, an amplification factor of 190, and interelectrode capacitances such as grid-plate and grid-filament at 6.0 mmf and plate-filament at 0.8 mmf.",{"name":68,"@type":59,"acceptedAnswer":69},"What maximum ratings and typical operating information are provided?",{"text":70,"@type":62},"Maximum ratings include DC plate voltage up to 2500 volts, DC plate input 565 watts, and plate dissipation 225 watts, along with typical operation values and two-tone modulation data at 30 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Spirituality",20,"religion-spirituality",{"id":116,"doc_module":4,"doc_module_name":25,"category_name":119,"show_sort_weight":116,"slug":120},"World Cup","world-cup",{"id":122,"doc_module":4,"doc_module_name":25,"category_name":123,"show_sort_weight":122,"slug":124},10,"Lifestyle","lifestyle",{"id":126,"doc_module":4,"doc_module_name":25,"category_name":127,"show_sort_weight":95,"slug":128},19,"General","general",{"code":4,"msg":80,"data":130},{"doc_id":77,"user_id":131,"nickname":42,"user_avatar":11,"doc_module":4,"category_id":100,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":132,"file_id":133,"file_url":134,"file_type":135,"file_size":136,"view_count":22,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":33,"language":137,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":138,"faqs":139,"seo_title":140,"seo_description":12,"update_tm":78,"read_time":122},658056,"s.BLinear  \nZERO BIAS POWER TRIODE by \"O'MALLEY\"  \n# FEATURES:\n\n▶ TWO 572-B's IN PARALLEL WILL PERMIT 1 KW INPUT  \n▶IN EVERY CASE DIRECT PLUG-IN REPLACEMENT FOR CONVENTIONAL811A's.  \n▶ CAPABLE OF 225 WATTS PLATE DISSIPATION.  \n▶300%INCREASE PLATE DISSIPATION OVER 811A's.  \n▶ ZERCONIUM IMPREGNATED GRAPHITE ANODE  \n▶ RUGGED BONDED THORIA FILAMENT-FOR LONGER LIFE.  \n# GENERAL CHARACTERISTICS\n\nELECTRICAL:  \nFilament Voltage ..............................  6.3 voltsCurrent ...........................4.0 ampsAmplification Factor............................190Interelectrode Capacitances:  \nGrid-Plate ............................  6.0 mmfGrid-Filament..........................   6.0 mmfPlate-Filament .........................  0.8 mmf  \n# MECHANICAL:\n\nBase...........................................4 pinRecommended Socket.........Johnson 122-224 or National XC4CIR4Dimensions-see outline drawingBulb(Nonex-hard glass)..................Max.temp.2000C  \nNote:O'Malley Type 572-B can be mounted base up or base down.  If mountedin a horizontal position,filament and grid should be in a vertical plane.  \nFOR LONGER LIFE:If the free circulation of air around the tube is re-stricted,a small fan or centrifugal blower may be used to provide additionalcooling for the tube.  \nSpecial Applications:If it is desired to operate this tube under conditionswidely different from those given here,please write to Application Engineer-ing Dept.,for information and recommendations.  \n525 Lehigh Ave.,Union,N.J.USA  \nSCIENTIFIC INSTRUMENT R&D CO.  \nPhone-Code 201-687-5550  \nRATINGS-DATA  \nfor Husky  \n# O'MALLEY ZERO BIAS POWER TRIODE:\n\nCLASS B-SSB SERVICE  \nTwo-Tone Modulation @ 30 Mc.  \nMAXIMUM RATINGS:  \nD-C Plate Voltage………………………………………………………………………………………………2500Voltsmax.  \nD-C Plate Grid…………………………………………………………………………………………………………250Ma.max.D-C Grid Current………………………………………………………………………………………………50Ma.max.  \nD-C Plate Input…………………………………………………………………………………………………………………565Watts  \nPlate Dissipation……………………………………………………………………………………………225Watts  \nTYPICAL OPERATION:  \nTwo-Tone Modulation @ 30 Mc.  \nD-C Plate Voltage………………………………………………………………………………2500Voltsmax.  \nD-C Grid Voltage………………………………………………………………………………………………………………05Mlts  \nZero Signal D-C Plate Current……………………………………………………………………225Ma.  \nD-C Plate Current at Peak Envelope……………………………………………………………225Ma.  \nAverage Plate Current……………………………………………………………………………160Ma.  \n………675Ma.  \n………110Volts  \nPeak Positive Grid Voltage……………………………………………………………………………………  \n··  \n……………35Ma.  \nAverage D-C Grid Current…………………………………………………………………………  \n·  \n135 Volts  \nMinimum Plate Voltage…………………………………………………………………………………………………  \n.. 560 Watts  \nD-C Input at Peak of Envelope…………………………………………………………………………  \n.. 400 Watts  \nPeak Envelope Power Output…………………………………………………………………………………  \n195 Watts  \nPlate Dissipation……………………………………………………………………………………………………………………  \n110 Volts  \nPeak R-F Grid Voltage………………………………………………………………………………………………………………………  \n150 Ma.  \nPeak Grid Current …………………………………………………………………………………………………………………………………  \nPeak of Envelope Grid Current……………………………………………………………………………………………………………………  \nDriving Power of Tube …………………………………………………………………………………………………………4.2Watts  \nEffective Load Resistance……………………………………………………………………………………………………6900Ohms  \n# CATHODE DRIVE CONDITIONS:\n\nFeed Through Power ………………………………………………………………………………17.5Watts  \nNote: \"Typical Operation\" data obtained by calculation  \nfrom published characteristic curves and direct tests.  \nNo allowances of circuit losses, input or output has  \nbeen made.  \n525 Lehigh Ave., Union, N.J.USA  \nSCIENTIFIC INSTRUMENT R&D Co.  \nPeak Plate Current……………………………………………………………………………………………………………  \n··  \n\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | !TYPE  \u003Cbr>HARACT  \u003Cbr>F=6.3","cbCaiiuck25aPr6w","https://ap.wps.com/l/cbCaiiuck25aPr6w","pdf",303488,"English","# FEATURES\n# GENERAL CHARACTERISTICS\n## ELECTRICAL\n## MECHANICAL\n# O'MALLEY ZERO BIAS POWER TRIODE\n# TYPICAL OPERATION AND RATINGS-DATA\n# CATHODE DRIVE CONDITIONS","[{\"question\":\"What capability does the 572-B triode offer when used in parallel?\",\"answer\":\"The sheet states that two 572-B tubes in parallel will permit 1 kW input.\"},{\"question\":\"What are the key electrical characteristics listed for the 572-B?\",\"answer\":\"It lists a filament voltage of 6.3 volts, filament current of 4.0 amps, an amplification factor of 190, and interelectrode capacitances such as grid-plate and grid-filament at 6.0 mmf and plate-filament at 0.8 mmf.\"},{\"question\":\"What maximum ratings and typical operating information are provided?\",\"answer\":\"Maximum ratings include DC plate voltage up to 2500 volts, DC plate input 565 watts, and plate dissipation 225 watts, along with typical operation values and two-tone modulation data at 30 Mc.\"}]","ZERO BIAS POWER TRIODE - 572-B - Tube Features and Ratings Data | PDF"]