{"product_id":"gec-kt66-nos-tubes-no-boxes","title":"GEC KT66 NOS tubes - No Boxes","description":"\u003cp\u003eGEC KT66 NOS tubes - No Boxes, tested within 5% of specification. \u003c\/p\u003e\n\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\"\u003eKT66\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e is a \u003cmark class=\"b6AQX\" data-wiz-attrbind=\"class=xKM5Ff_v\/cFwyDc\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwjpwsCK8cGXAxU0UUEAHQG3PU4QuJAPegoIAggACAAIChAD\" data-complete=\"true\"\u003ebeam power tetrode vacuum tube\u003c!--TgQPHd|||[[[null,null,null,null,null,null,null,null,null,null,null,null,[247864,null,0]]]]--\u003e\u003c\/mark\u003e introduced by the Marconi-Osram Valve Company (M-OV) in 1937, famous for combining the efficiency of a power pentode with the low-distortion linearity of a triode.\u003cspan\u003e [\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/KT66\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=oRTmOVsMQwo\u0026amp;t=3\"\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=xKM5Ff_14\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eOverview \u0026amp; History\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=\"2ahUKEwjpwsCK8cGXAxU0UUEAHQG3PU4Qi4wTegoIAggACAAIFxAA\" data-hveid=\"CAIIAAgACBcQAA\" data-complete=\"true\"\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBcQAQ\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBcQAg\" 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\"\u003eDesign:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e It uses two internal beam-forming plates tied to the cathode to eliminate the performance \"kink\" found in early tetrodes without needing a separate suppressor grid pin.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.thetubestore.com\/kt66-tube-review\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=oRTmOVsMQwo\u0026amp;t=3\"\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=\"CAIIAAgACBcQBw\" 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\"\u003eClassic Uses:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e It became a cornerstone of British high-fidelity and instrument amplification, powering legendary gear such as the Quad II hi-fi amplifier (1953), the Williamson amplifier (1947), and vintage Marshall JTM45 \"Bluesbreaker\" guitar amps.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.tubeampdoctor.com\/en\/kt66-tad-premium-matched\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.jazzguitar.be\/forum\/guitar-amps-gizmos\/29319-kt66-kt88-tubes-jazz.html\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.amazon.com\/Genalex-Gold-Lion-Power-Vacuum\/dp\/B01HQYYOC2\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=oRTmOVsMQwo\u0026amp;t=3\"\u003e4\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=\"CAIIAAgACBcQDA\" 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\"\u003eSonic Profile:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Known for a warm, thick midrange, deep and clean bass, smooth top-end chime, and an aggressive character when overdriven.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.eurotubes.com\/product\/kt66\/\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.ebay.com\/b\/Gec-Kt66\/64627\/bn_7023380200\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.tubedepot.com\/products\/genalex-gold-lion-kt66-power-vacuum-tube\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/www.jazzguitar.be\/forum\/guitar-amps-gizmos\/29319-kt66-kt88-tubes-jazz.html\"\u003e4\u003c\/a\u003e, \u003ca href=\"https:\/\/www.thetubestore.com\/kt66-tube-review\"\u003e5\u003c\/a\u003e, \u003ca href=\"https:\/\/www.tubeampdoctor.com\/en\/kt66-tad-premium-matched\"\u003e6\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=\"2ahUKEwjpwsCK8cGXAxU0UUEAHQG3PU4Qi4wTegoIAggACAAIHBAA\" data-hveid=\"CAIIAAgACBwQAA\" 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=xKM5Ff_29\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eCompatibility \u0026amp; Substitution\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=\"2ahUKEwjpwsCK8cGXAxU0UUEAHQG3PU4Qi4wTegoIAggACAAIIxAA\" data-hveid=\"CAIIAAgACCMQAA\" data-complete=\"true\"\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACCMQAQ\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACCMQAg\" 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\"\u003e6L6GC \/ 5881 Relationship:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e The KT66 is often used as a direct or near-equivalent substitute for the American \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e6L6GC\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e family, though it has a larger physical glass envelope and traditionally draws a higher heater\/filament current (around 1.3A vs. 0.9A for standard 6L6 types, depending on the manufacturer).\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.tonetubes.co.za\/kt66-jj-electronic.html\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.tubeampdoctor.com\/en\/kt66-tad-premium-matched\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.jazzguitar.be\/forum\/guitar-amps-gizmos\/29319-kt66-kt88-tubes-jazz.html\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/www.thetubestore.com\/kt66-tube-review\"\u003e4\u003c\/a\u003e, \u003ca href=\"https:\/\/www.thetubestore.com\/power-tubes\/kt66-tube-types\"\u003e5\u003c\/a\u003e]\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"GEC","offers":[{"title":"Default Title","offer_id":67759990472783,"sku":null,"price":3500.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0669\/4354\/9519\/files\/images_98ff2cdc-0296-4637-831d-4b200eaeb224.jpg?v=1792257221","url":"https:\/\/theoldstockroom.com\/products\/gec-kt66-nos-tubes-no-boxes","provider":"The Old Stockroom","version":"1.0","type":"link"}