{"product_id":"general-electric-ge-7581a-kt66","title":"General Electric (GE) 7581A \/ KT66","description":"\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACAoQAA\" data-complete=\"true\"\u003e\n\u003cspan data-subtree=\"aimfl,mfl\"\u003eThe \u003c\/span\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eGE 7581A\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e is a \u003cmark class=\"b6AQX\" data-wiz-attrbind=\"class=d4ajhe_r\/cFwyDc\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwiGk9OLgMKXAxVAdUEAHdruC68QuJAPegoIAggACAAIChAB\" data-complete=\"true\"\u003evintage, heavy-duty beam power pentode vacuum tube\u003c!--TgQPHd|||[[[null,null,null,null,null,null,null,null,null,null,null,null,[247864,null,0]]]]--\u003e\u003c\/mark\u003e manufactured in the United States by General Electric.\u003cspan\u003e [\u003ca href=\"https:\/\/www.ebay.com\/itm\/406068978414\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/135\/7\/7581A.pdf\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\" data-sfc-inited=\"2\"\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/div\u003e\n\u003cdiv class=\"ZLzG0d ncoeY E8xBUb\" role=\"heading\" aria-level=\"3\" data-animation-nesting=\"\" data-sfc-cp=\"\" data-wiz-attrbind=\"aria-level=d4ajhe_10\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eKey Features and Specifications\u003c!--TgQPHd|||[[2,[null,null,null,null,null,null,null,null,null,null,null,null,[351768,null,0]],[],null,1]]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwiGk9OLgMKXAxVAdUEAHdruC68Qi4wTegoIAggACAAIERAA\" data-hveid=\"CAIIAAgACBEQAA\" data-complete=\"true\"\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBEQAQ\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBEQAg\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eType:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Unipotential-coated cathode beam-power pentode (often cross-referenced or dual-labeled with \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eKT66\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e or \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e6L6GC\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e styles).\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.tubedepot.com\/products\/7581a-kt66?srsltid=AU7gw4U1QopXzmOWBArPMbzysBOvUKTUkSpKJZjfUQpRF6DSohH3RMTs\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/135\/7\/7581A.pdf\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBEQBw\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eHeater:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e 6.3V at 0.9A.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/135\/7\/7581A.pdf\"\u003e1\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBEQDA\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003ePlate Dissipation Rating:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e 35 watts (compared to 30 watts for a standard 6L6GC).\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.amplifiedparts.com\/products\/7581a-tung-sol-reissue-matched-vacuum-tube\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.rfparts.com\/tubes\/tubes-audio\/tubes-audiotubes-7581.html\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBEQEQ\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eMaximum Plate Voltage:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e 500V (pentode) \/ 450V (triode).\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/135\/7\/7581A.pdf\"\u003e1\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBEQFg\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eMaximum Screen Voltage:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e 450V.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.rfparts.com\/tubes\/tubes-audio\/tubes-audiotubes-7581.html\"\u003e1\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/ul\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\" data-sfc-inited=\"2\"\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwiGk9OLgMKXAxVAdUEAHdruC68Qi4wTegoIAggACAAIFxAA\" data-hveid=\"CAIIAAgACBcQAA\" data-complete=\"true\"\u003e\n\u003cdiv class=\"ZLzG0d ncoeY E8xBUb\" role=\"heading\" aria-level=\"3\" data-animation-nesting=\"\" data-sfc-cp=\"\" data-wiz-attrbind=\"aria-level=d4ajhe_2i\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eCommon Applications \u0026amp; Characteristics\u003c!--TgQPHd|||[[2,[null,null,null,null,null,null,null,null,null,null,null,null,[351768,null,0]],[],null,1]]--\u003e\n\u003c\/div\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwiGk9OLgMKXAxVAdUEAHdruC68Qi4wTegoIAggACAAIGRAA\" data-hveid=\"CAIIAAgACBkQAA\" data-complete=\"true\"\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBkQAQ\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBkQAg\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eAudio \u0026amp; Instrument Amps:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Widely used in vintage and modern high-end tube hi-fi amplifiers as well as guitar amplifiers (such as Fender and Ampeg variants) where extra clean headroom and a tighter, more defined low-end response are desired.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.kcanostubes.com\/content\/nos-ge-7581a-singles-and-matched-pairs\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.amplifiedparts.com\/products\/7581a-tung-sol-reissue-matched-vacuum-tube\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.thegearpage.net\/board\/index.php?threads\/ge-6l6gc-vs-ge-7581a-kt66.1068017\/page-6\"\u003e3\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBkQBw\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eInterchangeability:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e It is generally a direct drop-in replacement\/upgrade for standard \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e6L6GC\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e, \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e7581\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e, and \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eKT66\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e sockets, though circuit biasing should always be verified.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.amplifiedparts.com\/products\/7581a-tung-sol-reissue-matched-vacuum-tube\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/135\/7\/7581A.pdf\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBkQDA\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eSound Profile:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Users generally note that the GE 7581A stays cleaner and sharper at higher volumes compared to a standard 6L6GC, offering tighter bass and less early breakup.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.thegearpage.net\/board\/index.php?threads\/ge-6l6gc-vs-ge-7581a-kt66.1068017\/page-6\"\u003e1\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/ul\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\" data-sfc-inited=\"2\"\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/div\u003e","brand":"General Electric","offers":[{"title":"Default Title","offer_id":67762967707727,"sku":null,"price":1250.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0669\/4354\/9519\/files\/images_b634965d-7677-419c-b120-4eea350c53c2.jpg?v=1792272692","url":"https:\/\/theoldstockroom.com\/products\/general-electric-ge-7581a-kt66","provider":"The Old Stockroom","version":"1.0","type":"link"}