{"product_id":"cvc-12ax7-ecc83-triode-nos","title":"CVC 12AX7 (ECC83) Triode NOS","description":"\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIDRAA\" data-hveid=\"CAIIAAgACA0QAA\" 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=E3qFAb_14\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e1. The CVC (Chelmer Valve Company) Context\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=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIDxAA\" data-hveid=\"CAIIAAgACA8QAA\" data-complete=\"true\"\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACA8QAQ\" data-complete=\"true\"\u003eThe \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eChelmer Valve Company\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (now operating under \u003cspan data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-wiz-uids=\"E3qFAb_19\" data-complete=\"true\"\u003e\u003cspan class=\"\"\u003e\u003ca class=\"H23r4e\" rel=\"noopener\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQy_kOegoIAggACAAIDxAC\" data-hveid=\"CAIIAAgACA8QAg\" href=\"https:\/\/www.cvc-components.com\/\" target=\"_blank\"\u003eCVC Components Ltd\u003c\/a\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[[\u0026quot;https:\/\/www.cvc-components.com\/\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;CVC Components Ltd\u0026quot;,\u0026quot;Reliable Source for Industrial, Commercial and Defence Spares, Electronic Repair and Reverse Engineering CVC Components is your premier European stockist for hard-to-find, obsolete, and legacy components. We specialize in Avionic, Radar, Industrial, Commercial and Defence spares, striving to preserve and provide access to our rich technological heritage. Over the past six decades, we have built an unparalleled stock portfolio of industrial and commercial electronic components. This extensive collection is a result of strategic acquisitions, insightful stock purchases, and excess inventory acquisitions from Government and Defence sources. Starting from our humble origins, we have evolved into a global provider operating from our secure, purpose-built 250,000 cubic feet storage facility nestled within a 40-acre site. Our primary mission is to provide excellent customer service and meet your unique requirements.\u0026quot;,\u0026quot;https:\/\/encrypted-tbn2.gstatic.com\/images?q\\u003dtbn:ANd9GcQFc6ext7dekov_LmkGohyLEz8CjQaGU2pHvesgbipySKJdedmrhEq3fNfRwwrhCuRd7PCTgLccKs0cdbw\u0026quot;,\u0026quot;CVC Components Ltd\u0026quot;,\u0026quot;https:\/\/encrypted-tbn2.gstatic.com\/faviconV2?url\\u003dhttps:\/\/www.cvc-components.com\\u0026client\\u003dAIM\\u0026size\\u003d128\\u0026type\\u003dFAVICON\\u0026fallback_opts\\u003dTYPE,SIZE,URL\u0026quot;,[[1792408567817143,4283239,2804601482],null,null,null,null,[[2,0,0,14]]],null,\u0026quot;f83757c4-5517-4e8d-8755-005a93e64d38\u0026quot;]]--\u003e\u003c\/span\u003e in the UK) was established in 1961. Like many classic British valve distributors, \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eCVC is primarily a specialized tester and rebrander\/distributor\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e rather than a foundry that melts raw glass and stamps steel.\u003cspan\u003e [\u003ca href=\"https:\/\/www.diyaudio.com\/community\/threads\/advice-on-ecc83-valves.420509\/\"\u003e1\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\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=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIFxAA\" data-hveid=\"CAIIAAgACBcQAA\" data-complete=\"true\"\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACBcQAQ\" data-complete=\"true\"\u003eWhen you buy a valve with a \"CVC\" logo, it typically belongs to one of two categories:\u003cspan\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIHhAA\" data-hveid=\"CAIIAAgACB4QAA\" data-complete=\"true\"\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACB4QAQ\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACB4QAg\" 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\"\u003eVintage New Old Stock (NOS):\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e CVC famously acquired massive government, defense, and manufacturing surplus stocks over the decades. A vintage CVC 12AX7 could be a premium, British-made \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eMullard\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e or \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eBrimar\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e, or an American \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eRCA\/Sylvania\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e tube that was rigorously tested to military or high-end industrial specifications by Chelmer and printed with their logo.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.cvc-components.com\/\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.ebay.ca\/str\/cvcchelmervalvecompanylimited\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.ebay.com\/itm\/254336570505\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/www.cvc-components.com\/electron-tubes\"\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=\"CAIIAAgACB4QBw\" 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\"\u003eModern Selected Stock:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e For newer production, CVC screens bulk tubes manufactured in Russia, Slovakia, or China. They select units that show the lowest noise floor, tightest internal matching, and best resistance to microphonics (mechanical ringing), stamping them with the CVC branding for commercial and high-end audio use.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.stereonet.com\/forums\/topic\/345802-do-12ax7-eec83-tubes-need-to-be-matched-and-which-are-best\/\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/12AX7\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=75S6mX-6x0k\u0026amp;t=7\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/rubytubes.com\/blogs\/tube-of-the-month\/12ax7-ecc83-preamp-tube-guide-buyers-tips\"\u003e4\u003c\/a\u003e, \u003ca href=\"https:\/\/www.cvc-components.com\/electron-tubes\"\u003e5\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIHxAA\" data-hveid=\"CAIIAAgACB8QAA\" data-complete=\"true\"\u003e\n\u003chr class=\"s6NV4e\" data-sfc-root=\"ep\" data-epip=\"\" data-sfc-pl=\"|||[]\" data-complete=\"true\"\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIJhAA\" data-hveid=\"CAIIAAgACCYQAA\" 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=E3qFAb_3n\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e2. Core Architecture \u0026amp; Physical Design\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIJxAA\" data-hveid=\"CAIIAAgACCcQAA\" data-complete=\"true\"\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACCcQAQ\" data-complete=\"true\"\u003eThe 12AX7 is physically classified as a \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eminiature, indirectly heated dual-triode vacuum tube\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e.\u003cspan\u003e [\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/12AX7\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/184\/1\/12AX7.pdf\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIKRAA\" data-hveid=\"CAIIAAgACCkQAA\" data-complete=\"true\"\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACCkQAQ\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACCkQAg\" 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\"\u003eDual-Triode (Two-in-One):\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e The glass envelope houses two completely independent triode amplification circuits side by side. This means a single CVC 12AX7 can act as two separate stages of preamplification or handle two separate channels.\u003c!--TgQPHd|||[]--\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=\"CAIIAAgACCkQAw\" 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\"\u003eThe Triode Internals:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Inside each triode is a \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003ecathode\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (which is heated to emit electrons), a \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003econtrol grid\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (a fine wire mesh that regulates electron flow), and an \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eanode\/plate\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (the outer metallic structure that collects the electrons).\u003c!--TgQPHd|||[]--\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=\"CAIIAAgACCkQBA\" 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\"\u003eThe Envelope \u0026amp; Base:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e It uses a standard \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eT-6½ thin glass envelope\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e with a \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eNoval 9-pin button base (B9A)\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.youtube.com\/watch?v=Ks7H8uWPV9M\u0026amp;t=78\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=75S6mX-6x0k\u0026amp;t=7\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/184\/1\/12AX7.pdf\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/www.diyaudio.com\/community\/threads\/advice-on-ecc83-valves.420509\/\"\u003e4\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=PWQoi37-qH8\u0026amp;t=152\"\u003e5\u003c\/a\u003e, \u003ca href=\"http:\/\/www.r-type.org\/exhib\/aam0038.htm\"\u003e6\u003c\/a\u003e, \u003ca href=\"https:\/\/www.effectrode.com\/knowledge-base\/the-12ax7-tube\/\"\u003e7\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIKhAA\" data-hveid=\"CAIIAAgACCoQAA\" data-complete=\"true\"\u003e\n\u003chr class=\"s6NV4e\" data-sfc-root=\"ep\" data-epip=\"\" data-sfc-pl=\"|||[]\" data-complete=\"true\"\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIMBAA\" data-hveid=\"CAIIAAgACDAQAA\" 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=E3qFAb_4v\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e3. Electrical \u0026amp; Performance 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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIMhAA\" data-hveid=\"CAIIAAgACDIQAA\" data-complete=\"true\"\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACDIQAQ\" data-complete=\"true\"\u003eThe 12AX7 is famous because it is a \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eHigh-Mu tube\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e, meaning it provides massive voltage amplification relative to its size.\u003cspan\u003e [\u003ca href=\"https:\/\/www.effectrode.com\/knowledge-base\/the-12ax7-tube\/\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/093\/1\/12AX7A.pdf\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIMxAA\" data-hveid=\"CAIIAAgACDMQAA\" data-complete=\"true\"\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACDMQAQ\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACDMQAg\" 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\"\u003eAmplification Factor (μ \/ Mu):\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Officially rated at \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e100\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e. This is the maximum theoretical voltage gain, making it the highest-gain tube in common audio production. It allows weak guitar pickup signals or phono cartridge voltages to be boosted massively.\u003c!--TgQPHd|||[]--\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=\"CAIIAAgACDMQAw\" 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\"\u003eCenter-Tapped Heater Filament:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e The \"12\" in 12AX7 signifies a 12.6V heater requirement. However, because it is center-tapped, the heater wiring is highly versatile. It can run in \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eseries at 12.6V\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (drawing 0.15 Amps) or in \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eparallel at 6.3V\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (drawing 0.30 Amps), allowing it to drop into almost any audio chassis layout.\u003c!--TgQPHd|||[]--\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=\"CAIIAAgACDMQBA\" 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\"\u003eTransconductance (\\(g_{m}\\)):\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Relatively low, typically around \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e1.6 mA\/V\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (1600 micromhos) under standard operating conditions (250V on the plate, -2V on the grid).\u003c!--TgQPHd|||[]--\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=\"CAIIAAgACDMQBg\" 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 Resistance (\\(r_{p}\\)):\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e High internal resistance, averaging around \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e62.5k to 80k Ohms\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.ampvalves.co.uk\/12ax7-valve\/\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=75S6mX-6x0k\u0026amp;t=7\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=PWQoi37-qH8\u0026amp;t=152\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/tubemaze.info\/a-brief-history-of-12ax7-tubes\/\"\u003e4\u003c\/a\u003e, \u003ca href=\"https:\/\/www.effectrode.com\/knowledge-base\/the-12ax7-tube\/\"\u003e5\u003c\/a\u003e, \u003ca href=\"https:\/\/education.lenardaudio.com\/en\/14_valve_amps_3.html\"\u003e6\u003c\/a\u003e, \u003ca href=\"https:\/\/www.ampvalves.co.uk\/ecc83-12ax7-valve\/\"\u003e7\u003c\/a\u003e, \u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/184\/1\/12AX7.pdf\"\u003e8\u003c\/a\u003e, \u003ca href=\"https:\/\/frank.pocnet.net\/sheets\/093\/1\/12AX7A.pdf\"\u003e9\u003c\/a\u003e, \u003ca href=\"http:\/\/www.r-type.org\/exhib\/aam0038.htm\"\u003e10\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAINRAA\" data-hveid=\"CAIIAAgACDUQAA\" data-complete=\"true\"\u003e\n\u003chr class=\"s6NV4e\" data-sfc-root=\"ep\" data-epip=\"\" data-sfc-pl=\"|||[]\" data-complete=\"true\"\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAINhAA\" data-hveid=\"CAIIAAgACDYQAA\" 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=E3qFAb_6b\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e4. Technical Specifications Summary\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 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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAINxAA\" data-hveid=\"CAIIAAgACDcQAA\" data-complete=\"true\"\u003e\n\u003cdiv class=\"Fv6NCb\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQ-q4QegoIAggACAAINxAB\" data-hveid=\"CAIIAAgACDcQAQ\" data-complete=\"true\" data-sfc-inited=\"2\"\u003e\n\u003ctable class=\"NRefec\" data-animation-nesting=\"\"\u003e\n\u003ctbody\u003e\n\u003ctr class=\"cZCYO\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003cth class=\"iry6k\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eAttribute\u003c!--TgQPHd|||[]--\u003e\n\u003c\/th\u003e\n\u003cth class=\"iry6k\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eSpecification Value\u003c!--TgQPHd|||[]--\u003e\n\u003c\/th\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"cZCYO\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eAlternative Designations\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eECC83 (European), 7025 (Low-noise industrial), CV492 (Military)\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"cZCYO\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eMaximum Anode (Plate) Voltage\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e300V – 330V DC\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"cZCYO\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eMaximum Plate Dissipation\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e1.0 – 1.2 Watts per triode\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"cZCYO\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eTypical Anode Current\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e1.2 mA\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"cZCYO\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eAmplification Factor (Gain)\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e100\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"cZCYO\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e\n\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eBase Configuration\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003ctd class=\"Vk1lqb\" colspan=\"undefined\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e9-Pin Noval (EIA 9A \/ B9A pinout)\u003c!--TgQPHd|||[]--\u003e\n\u003c\/td\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!--qkimaf E3qFAb_6e\/HugV6--\u003e\n\u003cdiv class=\"chf7df\"\u003e\n\u003cdiv class=\"YHsVn\" data-ved=\"0CAAQkK0UahcKEwi4guyg-sWXAxUAAAAAHQAAAAAQCw\"\u003e\u003cbutton class=\"vif53e\" aria-label=\"Export to Google Sheets\" data-ved=\"0CAEQ-vMVahcKEwi4guyg-sWXAxUAAAAAHQAAAAAQCw\" data-hveid=\"1\"\u003e\u003cspan class=\"H3Obmd\"\u003e\u003csvg class=\"EQxvpc H3Obmd wffbD\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 -960 960 960\" aria-hidden=\"true\"\u003e\u003cpath d=\"M240-120q-51,0-85.5-34.5T120-240V-720q0-50 34.5-85T240-840H726q48,0 81,35.5T840-720v480q0,51-35,85.5T720-120H240ZM360-240q17,0 28.5-11.5T400-280V-560H680q17,0 28.5-11.5T720-600t-11.5-28.5T680-640H400v-40q0-17-11.5-28.5T360-720t-28.5,11.5T320-680v40H280q-17,0-28.5,11.5T240-600t11.5,28.5T280-560h40v280q0,17 11.5,28.5T360-240Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/button\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!--cqw1tb E3qFAb_6e\/HugV6--\u003e\u003c!--TgQPHd|||[[1,0,0,null,null,\u0026quot;\u0026quot;,null,1,\u0026quot;aim-table-58\u0026quot;]]--\u003e\n\u003c\/div\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIOBAA\" data-hveid=\"CAIIAAgACDgQAA\" data-complete=\"true\"\u003e\n\u003chr class=\"s6NV4e\" data-sfc-root=\"ep\" data-epip=\"\" data-sfc-pl=\"|||[]\" data-complete=\"true\"\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIPRAA\" data-hveid=\"CAIIAAgACD0QAA\" 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=E3qFAb_7b\/fLk2Md\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003e5. Tonal Profile and Audio Behavior\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=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIPhAA\" data-hveid=\"CAIIAAgACD4QAA\" data-complete=\"true\"\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACD4QAQ\" data-complete=\"true\"\u003eIn guitar amplifiers (like Marshall, Fender, and Vox) and Hi-Fi equipment, a CVC-selected 12AX7 shapes the fundamental \"warmth\" of the analog sound:\u003cspan\u003e [\u003ca href=\"https:\/\/www.tubeampdoctor.com\/magazin\/en\/a-complete-guide-to-the-12ax7a-tube\/\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.effectrode.com\/knowledge-base\/the-12ax7-tube\/\"\u003e2\u003c\/a\u003e]\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv data-bfc=\"\" class=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIQBAA\" data-hveid=\"CAIIAAgACEAQAA\" data-complete=\"true\"\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACEAQAQ\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACEAQAg\" 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\"\u003eHarmonic Distortion:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e When pushed hard into clipping, the 12AX7 generates smooth, mathematically pleasing \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eeven-order harmonic distortions\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e. This is the backbone of the classic rock guitar overdrive.\u003c!--TgQPHd|||[]--\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=\"CAIIAAgACEAQAw\" 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\"\u003eFrequency Response:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e It delivers rich, textured mid-range frequencies, transparent highs, and a compressed, dynamic low-end.\u003c!--TgQPHd|||[]--\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=\"CAIIAAgACEAQBA\" 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\"\u003ePosition Sensitivity:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e In multi-tube layouts, placing a premium low-noise tube like a tested CVC 12AX7 in the \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eV1 position\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (the absolute first stage of amplification where the raw instrument plugs in) is vital, as any noise or hiss generated here will be amplified by every subsequent stage of the amplifier.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/education.lenardaudio.com\/en\/14_valve_amps_3.html\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.tubeampdoctor.com\/magazin\/en\/a-complete-guide-to-the-12ax7a-tube\/\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/www.effectrode.com\/knowledge-base\/the-12ax7-tube\/\"\u003e3\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/watch?v=75S6mX-6x0k\u0026amp;t=7\"\u003e4\u003c\/a\u003e, \u003ca href=\"https:\/\/chipdatasheet.com\/tubes\/12ax7-pinout-specs-equivalent\/\"\u003e5\u003c\/a\u003e, \u003ca href=\"https:\/\/www.youtube.com\/shorts\/G-V_CzO9fy8\"\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 data-bfc=\"\" class=\"WYczDe\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-ved=\"2ahUKEwi3x-if-sWXAxVnW0EAHYrSKqcQi4wTegoIAggACAAIQRAA\" data-hveid=\"CAIIAAgACEEQAA\" data-complete=\"true\"\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-hveid=\"CAIIAAgACEEQAQ\" data-complete=\"true\"\u003eIf you are inspecting a physical CVC 12AX7 valve, let me know if you can see any \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003einternal construction markings\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (like plate size, halo\/cup getters, or etched batch numbers near the base). I can help you identify its \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"ep\" data-epip=\"\" data-complete=\"true\"\u003eexact original manufacturing foundry\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (e.g., vintage British Mullard vs. modern production)\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CVC","offers":[{"title":"Default Title","offer_id":67791223226447,"sku":null,"price":1400.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0669\/4354\/9519\/files\/images_1178efdc-5835-47de-adbe-c581d42851e7.jpg?v=1792408279","url":"https:\/\/theoldstockroom.com\/products\/cvc-12ax7-ecc83-triode-nos","provider":"The Old Stockroom","version":"1.0","type":"link"}