{"product_id":"western-electric-300b-vacuum-tubes-nos-matched-pair-tested-spec-87-58-86-58-sn-0752-0813","title":"Western Electric 300B Vacuum Tubes NOS Matched Pair Tested Spec. 87\/58 86\/58 SN-0752\/0813","description":"\u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003e\u003cspan\u003eWestern Electric 300B Vacuum Tubes NOS Matched Pair Tested Spec. 87\/58 86\/58 SN-0752\/0813\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eItem Details:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBrand\/Model:\u003c\/strong\u003e Western Electric 300B\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eType:\u003c\/strong\u003e Moderate power, filamentary triode, Class-A audio-frequency amplification\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Single-ended and push-pull amplifier output stages, power outputs of approx. 10W or less at relatively low plate voltages\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eFilament:\u003c\/strong\u003e Directly heated, oxide-coated filament; 5.0V AC or DC, nominal 1.2A current\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBase\/Mounting:\u003c\/strong\u003e Medium four-pin thrust-type base, compatible with WE 143B or similar sockets; mountable vertically or horizontally\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eInterelectrode Capacitance:\u003c\/strong\u003e Grid to plate 15 μμF, grid to filament 9 μμF, plate to filament 4.3 μμF\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS (New Old Stock)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMatching:\u003c\/strong\u003e Factory matched pair\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e 87\/58 and 86\/58\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSerial Numbers:\u003c\/strong\u003e SN-0752 \/ SN-0813\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eSummary:\u003c\/strong\u003e\u003cbr\u003eUp for sale is a New Old Stock (NOS) matched pair of Western Electric 300B vacuum tubes, tested with results of 87\/58 and 86\/58, serial numbers SN-0752 and SN-0813. The 300B is one of the most legendary tubes in audio history, prized for its directly heated, oxide-coated filament design that delivers a lush midrange, smooth treble, and remarkably natural, \"live\" timbre. As a matched pair, these tubes offer balanced performance ideal for push-pull configurations, or paired individually in single-ended triode (SET) amplifier designs where the 300B is especially revered. A great opportunity to acquire genuine, unused NOS Western Electric tubes for a 300B-based amplifier — a true reference tube for anyone chasing that classic, musical, tube-driven sound. Test results and serial numbers are documented and available for verification.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWe do take trade-ins, so please contact us if you wish to do so.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease make sure to thoroughly inspect item photos for cosmetic condition.  We do try to describe the item as accurately as possible, so if you have any questions about cosmetic condition please message us.\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Western Electric","offers":[{"title":"Default Title","offer_id":45937429446716,"sku":null,"price":2195.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0610\/9573\/9452\/files\/IMG_0515_aa37dd16-0294-497b-a69b-74c09769d8a5.jpg?v=1785409893","url":"https:\/\/3maaudio.com\/products\/western-electric-300b-vacuum-tubes-nos-matched-pair-tested-spec-87-58-86-58-sn-0752-0813","provider":"3mA High End Audio","version":"1.0","type":"link"}