{"product_id":"kt88-mullard","title":"KT88 Mullard","description":"\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAAgACAwQAA\" data-complete=\"true\"\u003e\n\u003cspan data-subtree=\"aimfl,mfl\"\u003eThe modern \u003c\/span\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eMullard KT88\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e is a \u003cmark class=\"b6AQX\" data-wiz-attrbind=\"class=g5sJaf_r\/cFwyDc\" data-sfc-root=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQuJAPegoIAggACAAIDBAB\" data-complete=\"true\"\u003ecurrent-production beam 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 manufactured in Russia (by New Sensor) and marketed as an affordable replacement for high-fidelity (Hi-Fi) stereo amplifiers and heavy-duty guitar amps like the Marshall Major.\u003cspan\u003e [\u003ca href=\"https:\/\/www.tubedepot.com\/products\/mullard-kt88-new-production-power-vacuum-tube\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/tubemaze.info\/mullard-kt88-russia\/\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/theoldstockroom.com\/products\/mullard-kt88\"\u003e3\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"c\" 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=g5sJaf_11\/fLk2Md\" data-sfc-root=\"c\" data-complete=\"true\"\u003eKey Characteristics \u0026amp; 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=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQi4wTegoIAggACAAIExAB\" data-hveid=\"CAIIAAgACBMQAQ\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eTube Type:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Octal-base beam power tetrode (can directly substitute for 6550 or other KT88 tubes with proper bias adjustment).\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.tonetubes.co.za\/6550-\/-kt88-beam-pwr-tetrode.html\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/theoldstockroom.com\/products\/mullard-kt88\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQi4wTegoIAggACAAIExAH\" data-hveid=\"CAIIAAgACBMQBw\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eHeater \/ Filament:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e 6.3V nominal (approx. 1.5A – 1.7A).\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/theoldstockroom.com\/products\/mullard-kt88\"\u003e1\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQi4wTegoIAggACAAIExAL\" data-hveid=\"CAIIAAgACBMQCw\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eMaximum Ratings:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Up to 800V plate\/anode voltage and roughly 42W–44W maximum plate dissipation.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.youtube.com\/watch?v=0xV-J5Tc0qQ\u0026amp;t=17\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/theoldstockroom.com\/products\/mullard-kt88\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQi4wTegoIAggACAAIExAS\" data-hveid=\"CAIIAAgACBMQEg\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eDesign \u0026amp; Build:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Features triple getters and cooling fins along the anode. Unlike vintage British Marconi-Osram (GEC) originals, modern Mullard tubes use standard metal\/aluminum grid rods rather than copper grid rods, meaning they differ in internal metallurgy and thermal dissipation characteristics.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/theoldstockroom.com\/products\/mullard-kt88\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/tubemaze.info\/mullard-kt88-russia\/\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQi4wTegoIAggACAAIExAW\" data-hveid=\"CAIIAAgACBMQFg\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eSound Profile:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Generally known for punchy and tight bass, rich mid-range presence, and an extended top end.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/upscaleaudio.com\/products\/mullard-kt88\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/theoldstockroom.com\/products\/mullard-kt88\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAAgACBMQAA\" data-complete=\"true\"\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/ul\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"c\" 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=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQi4wTegoIAggACAAIGRAA\" data-hveid=\"CAIIAAgACBkQAA\" 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=g5sJaf_2n\/fLk2Md\" data-sfc-root=\"c\" data-complete=\"true\"\u003eVintage vs. Modern Reissue\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=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQi4wTegoIAggACAAIIhAB\" data-hveid=\"CAIIAAgACCIQAQ\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eOriginal Mullard KT88s:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Mullard did not originally manufacture a true KT88 back in the golden era (as GEC held the design\/patent), though some GEC-made KT88s were historically rebranded or distributed under various names.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.talkbass.com\/threads\/kt88s-the-best-currently-available.1116325\/\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.diyaudio.com\/community\/threads\/kt88-superthread.361146\/\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=1WcLcHfSXq4\"\u003e3\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQi4wTegoIAggACAAIIhAH\" data-hveid=\"CAIIAAgACCIQBw\" data-complete=\"true\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cspan class=\"yADgie\"\u003eNew Production:\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e\u003cspan class=\"yADgie\"\u003e The current Mullard-labeled KT88 is a modern reissue produced to fit standard octal sockets, offering a budget-to-midrange alternative to premium lines like Genalex Gold Lion or vintage New Old Stock (NOS) GEC tubes. Specialized audio suppliers like \u003c\/span\u003e\u003cspan data-sfc-cp=\"\" data-sfc-root=\"c\" data-wiz-uids=\"g5sJaf_43\" data-complete=\"true\" data-sfc-inited=\"2\"\u003e\u003cspan class=\"\"\u003e\u003ca class=\"H23r4e\" rel=\"noopener\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQy_kOegoIAggACAAIIhAJ\" data-hveid=\"CAIIAAgACCIQCQ\" href=\"https:\/\/upscaleaudio.com\/products\/mullard-kt88\" target=\"_blank\"\u003e\u003cspan class=\"yADgie\"\u003eUpscale Audio\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[[\u0026quot;https:\/\/upscaleaudio.com\/products\/mullard-kt88\u0026quot;,null,null,[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[{\u0026quot;1218\u0026quot;:[16,null,null,null,[1]]}]],16,null,\u0026quot;Mullard KT88 – Upscale Audio\u0026quot;,\u0026quot;Product: Mullard KT88 power tube ($74.95, single tube pricing). Features: Platinum Screened \\u0026 Tested with 72-hour burn-in and real-world voltage testing; free matching in any quantity; stunning mids, extended top end, and tight bass. Sourcing: Upscale Audio pays factories extra to pre-test and select the top 50% of production. Quality Policy: Excludes defective tubes with shorts or gas, ensuring longer life; exception to normal return policy.\u0026quot;,\u0026quot;https:\/\/encrypted-tbn0.gstatic.com\/images?q\\u003dtbn:ANd9GcSBEUeVI2hKSq7JeLIBPyFxbYTQ7iUgN6Pa7vAzCV6USPO8rx0vAZYDFkxynwd7l3hj84BaQYxewi2wwas\u0026quot;,\u0026quot;Upscale Audio\u0026quot;,\u0026quot;https:\/\/encrypted-tbn3.gstatic.com\/faviconV2?url\\u003dhttps:\/\/upscaleaudio.com\\u0026client\\u003dAIM\\u0026size\\u003d128\\u0026type\\u003dFAVICON\\u0026fallback_opts\\u003dTYPE,SIZE,URL\u0026quot;,[[1792967210601653,4277519,2165574313],null,null,null,null,[[2,0,0,31]]],null,\u0026quot;85e74c9a-2f22-41db-8c7b-ea354ce16fed\u0026quot;]]--\u003e\u003c\/span\u003e\u003cspan class=\"yADgie\"\u003e and \u003c\/span\u003e\u003cspan data-sfc-cp=\"\" data-sfc-root=\"c\" data-wiz-uids=\"g5sJaf_45\" data-complete=\"true\"\u003e\u003cspan class=\"\"\u003e\u003ca class=\"H23r4e\" rel=\"noopener\" data-ved=\"2ahUKEwi1mbqtm9aXAxUPRUEAHakKFIEQy_kOegoIAggACAAIIhAK\" data-hveid=\"CAIIAAgACCIQCg\" href=\"https:\/\/www.tubedepot.com\/products\/mullard-kt88-new-production-power-vacuum-tube\" target=\"_blank\"\u003e\u003cspan class=\"yADgie\"\u003eTubeDepot\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[[\u0026quot;https:\/\/www.tubedepot.com\/products\/mullard-kt88-new-production-power-vacuum-tube\u0026quot;,null,null,[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[{\u0026quot;1218\u0026quot;:[16,null,null,null,[1]]}]],16,null,\u0026quot;Mullard KT88 New Production Power Vacuum Tube\u0026quot;,\u0026quot;MU-KT88 The new production Mullard KT88 is an exact copy of the KT88 valves that were manufactured by Marconi-Osram in the late 1960s and 1970s. Excellent replacement output tubes for any hi-fi application as well as the Marshall Major to retain the original sound.\u0026quot;,\u0026quot;https:\/\/encrypted-tbn1.gstatic.com\/images?q\\u003dtbn:ANd9GcQzKaEJ0lw0AdmSddKuOJZYN6CC7Db1DJDGbzZgl0yJDnZ4pETx31S1bNtPbURW2k6OICTUOckKe5I4Vbg\u0026quot;,\u0026quot;TubeDepot.com\u0026quot;,\u0026quot;https:\/\/encrypted-tbn3.gstatic.com\/faviconV2?url\\u003dhttps:\/\/www.tubedepot.com\\u0026client\\u003dAIM\\u0026size\\u003d128\\u0026type\\u003dFAVICON\\u0026fallback_opts\\u003dTYPE,SIZE,URL\u0026quot;,[[1792967210601653,4277519,2165574313],null,null,null,null,[[2,0,0,32]]],null,\u0026quot;3215a94b-5250-4806-93d1-6af87f4247a5\u0026quot;]]--\u003e\u003c\/span\u003e\u003cspan class=\"yADgie\"\u003e offer matched pairs, quads, or pre-tested\/burned-in tiers.\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.ebay.com\/shop\/mullard-kt88?_nkw=mullard+kt88\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.diyaudio.com\/community\/threads\/kt88-superthread.361146\/\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.tubedepot.com\/products\/mullard-kt88-new-production-power-vacuum-tube\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/upscaleaudio.com\/products\/mullard-kt88\"\u003e4\u003c\/a\u003e]\u003c\/span\u003e\n\u003c\/div\u003e","brand":"Mullard","offers":[{"title":"Default Title","offer_id":67866073235535,"sku":null,"price":1380.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0669\/4354\/9519\/files\/images_0453f6fb-c765-47ae-83b9-5a32f6a936c9.jpg?v=1792967374","url":"https:\/\/theoldstockroom.com\/products\/kt88-mullard","provider":"The Old Stockroom","version":"1.0","type":"link"}