{"product_id":"sylvania-5881-6l6wgb-matched-quad-nos-nib","title":"Sylvania 5881\/6L6WGB Matched Quad NOS NIB","description":"\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--header-height)\" dir=\"auto\" data-turn-id=\"e23f8fdf-980b-4fce-ace9-a93317a41b02\" data-testid=\"conversation-turn-11\" data-scroll-anchor=\"false\" data-turn=\"user\"\u003e\u003c\/section\u003e\n\u003ch1 data-turn-id-container=\"e23f8fdf-980b-4fce-ace9-a93317a41b02\" data-is-intersecting=\"true\"\u003eSylvania 5881\/6L6WGB Matched Quad NOS NIB\u003cbr\u003e\n\u003c\/h1\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-WEB:423c9f11-fe08-4f62-a83f-28460e7cea7d-5\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:423c9f11-fe08-4f62-a83f-28460e7cea7d-5\" data-testid=\"conversation-turn-12\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"537969da-4207-4d10-a04b-d13232e2772c\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full dark markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"104\"\u003eThe Sylvania-made 5881 \/ 6L6WGB is one of the toughest and most musical American power tubes ever built.\u003c\/p\u003e\n\u003cp data-start=\"106\" data-end=\"492\"\u003eManufactured by Sylvania and RCA branded during the golden age of American tube production, these ruggedized 5881s were designed for reliability, stability, and long service life. Originally developed for military and industrial applications, the 6L6WGB became a favorite in guitar amplifiers and hi-fi equipment thanks to its smooth breakup, tight low end, and warm American character.\u003c\/p\u003e\n\u003cp data-start=\"494\" data-end=\"790\"\u003eThe 5881 helped power some of the most legendary American amplifiers ever made, including the tweed Fender Bassman 5F6-A, early Fender Twin models, and the famous Ampeg Portaflex B-15. Its balanced tone, durability, and musical compression made it a defining tube of 1950s American amplification.\u003c\/p\u003e\n\u003cp data-start=\"792\" data-end=\"1116\"\u003eCompared to larger 6L6GC types, the 5881\/6L6WGB typically delivers slightly earlier breakup and compression, making it especially loved in vintage Fender-style amplifiers where touch sensitivity and warmth matter most. In hi-fi systems, they offer a smooth, balanced presentation with excellent clarity and natural dynamics.\u003c\/p\u003e\n\u003cp data-start=\"1118\" data-end=\"1366\"\u003eThese particular tubes were manufactured by Sylvania and rebranded for RCA, something that was extremely common during the tube era. Many of the best American tube companies sourced tubes from one another while maintaining strict quality standards.\u003c\/p\u003e\n\u003cp data-start=\"1368\" data-end=\"1562\"\u003eThis matched quad has been carefully tested and matched for strong, balanced performance and is ideal for stereo hi-fi amplifiers or larger guitar amplifiers requiring four matched output tubes.\u003c\/p\u003e\n\u003cp data-start=\"1564\" data-end=\"1694\"\u003eEvery tube is thoroughly tested, matched, verified for proper operating function, and backed by the Fuzz Audio one-year guarantee.\u003c\/p\u003e\n\u003cp data-start=\"1696\" data-end=\"1728\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"1696\" data-end=\"1728\" data-is-last-node=\"\"\u003eTested. Matched. Guaranteed.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Fuzz Audio","offers":[{"title":"Default Title","offer_id":42392045486115,"sku":null,"price":496.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0275\/0699\/9331\/files\/Sylvania_5881_6L6WGB_Matched_Quad.jpg?v=1778197229","url":"https:\/\/fuzzaudio.shop\/en-ca\/products\/sylvania-5881-6l6wgb-matched-quad-nos-nib","provider":"Fuzz Audio","version":"1.0","type":"link"}