{"product_id":"kt77-el34-jj-matched-quad-amplitrex-tested-tubes-new-4-valvole-in-original-box","title":"KT77 EL34 JJ Matched Quad AMPLITREX Tested Tubes -NEW- 4 Valves IN ORIGINAL BOX","description":"\u003cp\u003e\u003cstrong\u003eKT77 EL34 JJ Electronics Matched Quad – AMPLITREX Tested – New Production – Original Box\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMADE IN SLOVAKIA\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eGeneral Description\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eKT77\u003c\/b\u003e\u003c\/span\u003e is an \u003cspan class=\"s1\"\u003e\u003cb\u003eoctal base beam power pentode\u003c\/b\u003e\u003c\/span\u003e, suitable for use in the vast majority of amplifiers designed for \u003cspan class=\"s1\"\u003e\u003cb\u003eEL34\u003c\/b\u003e\u003c\/span\u003e. Compared to the EL34 and E34L, it offers \u003cspan class=\"s1\"\u003e\u003cb\u003egreater available power, more authoritative bass, and superior headroom\u003c\/b\u003e\u003c\/span\u003e, while maintaining a high level of detail and balanced tonal rendition.\u003c\/p\u003e\n\u003cp\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eKT77 JJ\u003c\/b\u003e\u003c\/span\u003e represents one of the most successful modern interpretations of this historic tube: a production designed to ensure \u003cspan class=\"s1\"\u003e\u003cb\u003ereliability, electrical consistency, and high-level sonic performance\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003eThe tubes are \u003cspan class=\"s1\"\u003e\u003cb\u003eNEW\u003c\/b\u003e\u003c\/span\u003e, supplied \u003cspan class=\"s1\"\u003e\u003cb\u003ein original JJ boxes\u003c\/b\u003e\u003c\/span\u003e, and \u003cspan class=\"s1\"\u003e\u003cb\u003ecarefully selected and matched in our laboratory\u003c\/b\u003e\u003c\/span\u003e using \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX\u003c\/b\u003e\u003c\/span\u003e, to ensure stable, uniform, and repeatable operation within the amplifier.\u003c\/p\u003e\n\u003cp\u003eAn extremely popular choice as an \u003cspan class=\"s1\"\u003e\u003cb\u003eadvanced alternative to the EL34\u003c\/b\u003e\u003c\/span\u003e, the KT77 JJ retains its fundamental musicality while adding \u003cspan class=\"s1\"\u003e\u003cb\u003econtrol, extension, and authority\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSonic Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe tonal quality of the \u003cstrong\u003eKT77 JJ\u003c\/strong\u003e is modern, balanced, and solid, with a consistent response across the entire audio spectrum.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eBass: \u003c\/b\u003eDeep, controlled, and well-articulated. The low end is compact and fast, with a greater sense of substance compared to a traditional EL34, also ideal for amplifiers with generous transformers.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMids: \u003c\/b\u003eRich, present, and well-structured. Vocals are natural and well-sculpted, with excellent intelligibility and no excessive coloration.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHighs: \u003c\/b\u003eOpen, orderly, and well-extended. The top end is clean and detailed, never aggressive, also suitable for high-resolution systems.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDynamics: \u003c\/b\u003eResponsive and controlled. The KT77 JJ responds promptly to transients and conveys a sense of power that is always managed, making it versatile and musical across a wide variety of genres.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSoundstage: \u003c\/b\u003eBroad and stable soundstage, with good depth and proper instrument separation. The imaging is focused and believable.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIdeal for \u003cspan class=\"s1\"\u003e\u003cb\u003eEL34 \/ KT77 compatible\u003c\/b\u003e\u003c\/span\u003e amplifiers, in both \u003cspan class=\"s1\"\u003e\u003cb\u003epush-pull\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003esingle-ended\u003c\/b\u003e\u003c\/span\u003e configurations where applicable. An excellent choice for those seeking \u003cspan class=\"s1\"\u003e\u003cb\u003egreater control and definition\u003c\/b\u003e\u003c\/span\u003e, without sacrificing musicality.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e🎸 Use in Musical Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAlso highly valued in \u003cspan class=\"s1\"\u003e\u003cb\u003eguitar amps\u003c\/b\u003e\u003c\/span\u003e, where they offer a firmer and more defined sound than the EL34, with \u003cspan class=\"s1\"\u003e\u003cb\u003esuperior headroom\u003c\/b\u003e\u003c\/span\u003e and a more compact and controlled low-frequency response.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e🎯 Note for audiophiles and technicians\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003efactory new\u003c\/b\u003e\u003cspan class=\"s1\"\u003e,\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003etested and matched on AMPLITREX\u003c\/b\u003e\u003cspan class=\"s1\"\u003e,\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003esupplied in original packaging\u003c\/b\u003e\u003cspan class=\"s1\"\u003e,\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003edesigned for those who desire \u003c\/span\u003e\u003cb\u003emodern reliability and a solid, balanced, and authoritative sonic performance\u003c\/b\u003e\u003cspan class=\"s1\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAn ideal quad to upgrade or maintain EL34-compatible amplifiers at the highest level, with the assurance of a professional \u003cspan class=\"s1\"\u003e\u003cb\u003eVacuum Tubes Treasures\u003c\/b\u003e\u003c\/span\u003e selection.\u003c\/p\u003e\n\u003chr data-end=\"1745\" data-start=\"1742\"\u003e\n\u003ch3 data-end=\"1771\" data-start=\"1747\"\u003eTest Specifications\u003c\/h3\u003e\n\u003cp data-end=\"1884\" data-start=\"1772\"\u003eTubes tested on \u003cstrong data-end=\"1824\" data-start=\"1791\"\u003eAmplitrex AT-1000 Tube Tester\u003c\/strong\u003e\u003cbr data-end=\"1827\" data-start=\"1824\"\u003eMeasurements taken after 10 minutes of warm-up\u003c\/p\u003e\n\u003cp data-end=\"2082\" data-start=\"1886\"\u003e\u003cstrong data-end=\"1916\" data-start=\"1886\"\u003eAdditional tests performed:\u003c\/strong\u003e\u003cbr data-end=\"1919\" data-start=\"1916\"\u003e• Microphonics: standard – compliant for use in hi-fi and musical instruments\u003cbr data-end=\"1996\" data-start=\"1993\"\u003e• Emission: excellent – strong and stable emission\u003cbr data-end=\"2050\" data-start=\"2047\"\u003e• Short circuits and GAS: absent\u003c\/p\u003e\n\u003cp data-end=\"2220\" data-start=\"2084\"\u003eThe quad is matched exclusively on real static parameters, to guarantee consistency, reliability, and symmetry between the two channels.\u003c\/p\u003e\n\u003chr data-end=\"2225\" data-start=\"2222\"\u003e\n\u003ch3 data-end=\"2243\" data-start=\"2227\"\u003eConditions\u003c\/h3\u003e\n\u003cp data-end=\"2373\" data-start=\"2244\"\u003e• Supplied in original box\u003cbr data-end=\"2277\" data-start=\"2274\"\u003e• Functionality: impeccable\u003cbr data-end=\"2307\" data-start=\"2304\"\u003e• Factory new, tested and perfectly functional tubes\u003c\/p\u003e\n\u003cp data-end=\"2479\" data-start=\"2375\"\u003e\u003cstrong data-end=\"2388\" data-start=\"2375\"\u003eWarranty:\u003c\/strong\u003e\u003cbr data-end=\"2391\" data-start=\"2388\"\u003e• Consumers: 24 months (Legislative Decree 206\/2005)\u003cbr data-end=\"2434\" data-start=\"2431\"\u003e• B2B: articles 1490 et seq. of the Civil Code apply\u003c\/p\u003e\n\u003chr data-end=\"3076\" data-start=\"3073\"\u003e\n\u003ch3 data-end=\"3107\" data-start=\"3078\"\u003eAdditional Information\u003c\/h3\u003e\n\u003cp data-end=\"3252\" data-start=\"3108\"\u003eJJ tubes may exhibit slight differences in glass envelope height, without any impact on technical or sonic performance.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e🔍 Find out what we really think: \u003ca rel=\"noopener\" title=\"Guida completa alla valvola 6550 JJ\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/guida-completa-alla-valvola-6550-jj\" target=\"_blank\"\u003eread our complete guide to the 6550 JJ.\u003c\/a\u003e\u003c\/p\u003e","brand":"JJ ELECTRONICS","offers":[{"title":"Default Title","offer_id":57214730436956,"sku":"03487","price":140.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/s-l1600_d8b26725-c604-467b-a5aa-fd59e91c71ae.webp?v=1774886887","url":"https:\/\/vacuumtubestreasures.com\/en-ch\/products\/kt77-el34-jj-matched-quad-amplitrex-tested-tubes-new-4-valvole-in-original-box","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}