{"product_id":"4-1000a","title":"4-1000A","description":"\u003ch2 style=\"font-size: 32px; margin-top: 15px;\"\u003e4-1000A tube specs\u003c\/h2\u003e\n\u003cp\u003eThe table below lists general specifications commonly referenced for selection and planning. For the complete ratings and curves, use the data sheet in the section that follows.\u003c\/p\u003e\n\u003cp\u003e4-1000A General Specifications\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ccc; font-family: Arial, sans-serif; margin: 12px 0;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eTube type\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eHigh-power transmitting triode, glass construction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eFilament (heater)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e7.5V at 21A, standard SK-510 base socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eMaximum plate dissipation\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e1,000W, forced air cooling required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eTypical plate voltage\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e3.0-6.0kV, depending on service (AM, CW, Linear)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eFrequency range\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eUp to 110 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eCooling\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eRadiation and forced air\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eEquivalents \/ AKAs\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e8166; 4-1000 (earlier version)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eDirect replacement\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eEimac 4-1000A\/8166, interchangeable with Amperex 4-1000A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eTypical applications\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eHAM HF linears, AM broadcast transmitters, FM broadcast modulators, RF\/dielectric heating systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"font-size: 32px; margin-top: 15px;\"\u003e4-1000A tube data sheet download\u003c\/h3\u003e\n\u003cp\u003eDownload the complete data sheet for detailed ratings, characteristic curves, typical operating points, and cooling guidance.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0707\/6996\/7348\/files\/4-1000A.pdf?v=1774883691\"\u003eDownload 4-1000A Data Sheet (PDF)\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3 style=\"font-size: 32px; margin-top: 15px;\"\u003e4-1000A tube substitute \u0026amp; equivalent information\u003c\/h3\u003e\n\u003cp\u003eThis model is a direct replacement for Eimac 4-1000A \/ 8166 and is fully interchangeable with Amperex, RCA, Machlett, Taylor, and other compliant 4-1000A models.\u003c\/p\u003e\n\u003cp\u003eIn many legacy installations originally labelled “4-1000,” the 4-1000A supersedes the earlier version without circuit changes. As a 4-1000A tube equivalent, it commonly serves in 1 kW-class AM broadcast transmitters, high-power HF linear amplifiers for amateurs, and industrial RF\/dielectric heating generators.\u003c\/p\u003e\n\u003cp\u003eThe 4-1000A remains a proven workhorse across broadcast transmitters, HF linear amplifiers, and industrial RF\/dielectric heating systems, valued for its reliability and full interchangeability with Amperex, RCA, Machlett, Taylor, and other legacy versions.\u003c\/p\u003e\n\u003cp\u003eAs a direct replacement for Eimac 4-1000A \/ 8166, it offers modern manufacturing consistency while preserving classic triode performance.\u003c\/p\u003e\n\u003cp\u003ePenta Labs, a trusted \u003ca href=\"https:\/\/pentalabs.com\/\" rel=\"noopener\" target=\"_blank\"\u003evacuum tubes producer\u003c\/a\u003e for professionals and engineers, continues to supply precision-tested tubes for both legacy and new designs. For related components, see our durable \u003ca href=\"https:\/\/pentalabs.com\/collections\/ham-radio\" rel=\"noopener\" target=\"_blank\"\u003eradio tubes\u003c\/a\u003e, precision \u003ca href=\"https:\/\/pentalabs.com\/collections\/hi-fi-audio-amplification\" rel=\"noopener\" target=\"_blank\"\u003ehifi vacuum tubes\u003c\/a\u003e, and compatible \u003ca href=\"https:\/\/pentalabs.com\/collections\/tetrodes\" rel=\"noopener\" target=\"_blank\"\u003etetrode vacuum tube\u003c\/a\u003e lines supporting high-power RF systems.\u003c\/p\u003e","brand":"Penta Laboratories","offers":[{"title":"Default Title","offer_id":47834428899572,"sku":null,"price":0.0,"currency_code":"USD","in_stock":false}],"url":"https:\/\/pentalabs.com\/products\/4-1000a","provider":"Penta Laboratories","version":"1.0","type":"link"}