{"product_id":"300b-electro-harmonix","title":"300b Electro-Harmonix","description":"\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAAgACAsQAA\" data-complete=\"true\"\u003e\n\u003cspan data-subtree=\"aimfl,mfl\"\u003eThe \u003c\/span\u003e\u003cspan data-sfc-cp=\"\" data-sfc-root=\"c\" data-wiz-uids=\"gyedme_r\" data-complete=\"true\"\u003e\u003cspan class=\"\"\u003e\u003ca class=\"H23r4e\" rel=\"noopener\" data-ved=\"2ahUKEwjzjrPq2dWXAxUqUUEAHbeoPI0Qy_kOegoIAggACAAICxAB\" data-hveid=\"CAIIAAgACAsQAQ\" href=\"https:\/\/shop.ehx.com\/item\/300beh%20gold\/tubes-vacuum-eh-gold\/\" target=\"_blank\"\u003eElectro-Harmonix 300B Gold Grid Power Tube\u003c\/a\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[[\u0026quot;https:\/\/shop.ehx.com\/item\/300beh%20gold\/tubes-vacuum-eh-gold\/\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;Electro-Harmonix Gold 300B Gold Grids Power Tube | 300BEH GOLD | Electro-Harmonix\u0026quot;,\u0026quot;Product: Electro-Harmonix Gold 300B Gold Grids Power Tube (Item: 300BEH GOLD) Price: $289.02 \/ BOX Availability: In Stock Origin: RUSSIA Features: Premium version of 300B EH with gold grid wire for increased bias stability, top sonics\/performance. Related pricing: Electro-Harmonix 300B ($237.58 \/ BOX), Genalex Gold Lion PX300B ($362.46 \/ BOX). Copyright: 2026 New Sensor Corp.\u0026quot;,\u0026quot;https:\/\/encrypted-tbn1.gstatic.com\/images?q\\u003dtbn:ANd9GcSomeB6XePg5T9fZhnzx3t9LOI4Er5K-L-_O3YMrkbjfw3JNhPnlab9BBtRaIu6x_W_mbJc25epV6Pkgjg\u0026quot;,\u0026quot;Electro-Harmonix\u0026quot;,\u0026quot;https:\/\/encrypted-tbn0.gstatic.com\/faviconV2?url\\u003dhttps:\/\/shop.ehx.com\\u0026client\\u003dAIM\\u0026size\\u003d128\\u0026type\\u003dFAVICON\\u0026fallback_opts\\u003dTYPE,SIZE,URL\u0026quot;,[[1792949621671795,4280618,2369562807],null,null,null,null,[[2,0,0,9]]],null,\u0026quot;72b8a50b-2dca-4810-942a-08cf89d95cc5\u0026quot;]]--\u003e\u003c\/span\u003e is a \u003cmark class=\"b6AQX\" data-wiz-attrbind=\"class=gyedme_s\/cFwyDc\" data-sfc-root=\"c\" data-ved=\"2ahUKEwjzjrPq2dWXAxUqUUEAHbeoPI0QuJAPegoIAggACAAICxAC\" data-complete=\"true\"\u003edirectly heated power triode vacuum tube manufactured in Russia by New Sensor Corp\u003c!--TgQPHd|||[[[null,null,null,null,null,null,null,null,null,null,null,null,[247864,null,0]]]]--\u003e\u003c\/mark\u003e, designed as a reliable, high-value alternative to the classic Western Electric 300B.\u003cspan\u003e [\u003ca href=\"https:\/\/shop.ehx.com\/item\/300beh%20gold\/tubes-vacuum-eh-gold\/\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.hotroxuk.com\/electro-harmonix-300b-eh.html\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/300B\"\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=gyedme_12\/fLk2Md\" data-sfc-root=\"c\" data-complete=\"true\"\u003eKey Specifications \u0026amp; 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\u003cdiv data-bfc=\"\" class=\"\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-ved=\"2ahUKEwjzjrPq2dWXAxUqUUEAHbeoPI0Qi4wTegoIAggACAAIFBAB\" data-hveid=\"CAIIAAgACBQQAQ\" 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:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Mirrors the classic Western Electric 300B with an 8-course directly heated filament, large-shoulder ST glass envelope, and a 40-watt plate dissipation.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/theoldstockroom.com\/products\/electro-harmonix-300b-eh-no-boxespair\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/www.hotroxuk.com\/electro-harmonix-300b-eh.html\"\u003e2\u003c\/a\u003e, \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/300B\"\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=\"2ahUKEwjzjrPq2dWXAxUqUUEAHbeoPI0Qi4wTegoIAggACAAIFBAH\" data-hveid=\"CAIIAAgACBQQBw\" 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\"\u003eElectrical Match:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Matches the plate curves and static DC characteristics (plate resistance, transconductance, and μ) of the original 300B, making it a drop-in replacement for vintage and modern amplifiers.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e [\u003ca href=\"https:\/\/www.watfordvalves.com\/product_detail.asp?id=4198\"\u003e1\u003c\/a\u003e, \u003ca href=\"https:\/\/theoldstockroom.com\/products\/electro-harmonix-300b-eh-no-boxespair\"\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=\"2ahUKEwjzjrPq2dWXAxUqUUEAHbeoPI0Qi4wTegoIAggACAAIFBAN\" data-hveid=\"CAIIAAgACBQQDQ\" 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\"\u003eStandard vs. Gold Grid (GG) Version:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAAgACBQQDw\" data-complete=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAAgACBQQEA\" 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\"\u003eStandard 300B:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Built as a rugged, balanced OEM workhorse with a clean lower end and good detail.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAAgACBQQEQ\" data-complete=\"true\"\u003e\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\"\u003eGold Grid \/ Gold Pin Version:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Features gold-plated grid wire and gold-plated pins, which reduce grid current, improve bias stability, prevent pin oxidation, and extend overall tube life\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Electro-Harmonix","offers":[{"title":"Default Title","offer_id":67865423413327,"sku":null,"price":1800.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0669\/4354\/9519\/files\/images_cc4177e6-0bee-48b4-9eb4-72d800f655eb.jpg?v=1792949622","url":"https:\/\/theoldstockroom.com\/products\/300b-electro-harmonix","provider":"The Old Stockroom","version":"1.0","type":"link"}