{"product_id":"12ax7-ecc83-amperex-bugle-boy-amplitrex-tested-long-plates-foil-getter-50s","title":"12AX7 \/ ECC83 Amperex Bugle Boy AMPLITREX Tested Long Plates Foil Getter '58","description":"\u003cp\u003e\u003cstrong\u003e12AX7 \/ ECC83 NOS Amperex Bugle Boy Long Plates – Foil Getter – Heerlen 1958 – Amplitrex Tested\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003e\u003cmeta charset=\"utf-8\"\u003eThis \u003cstrong data-start=\"391\" data-end=\"430\"\u003eNOS Amperex Bugle Boy 12AX7 \/ ECC83\u003c\/strong\u003e, produced in \u003cstrong data-start=\"443\" data-end=\"468\"\u003eHeerlen (Holland) in 1958\u003c\/strong\u003e, belongs to the historical phase of the first \u003cstrong data-start=\"511\" data-end=\"538\"\u003eLong Plates Foil Getter\u003c\/strong\u003e, one of the configurations most sought after by enthusiasts today for its musicality, tonal refinement, and extremely meticulous internal construction.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe manufacturing code is authentic and consistent with Heerlen production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003emC6 \u003c\/b\u003eis clearly legible\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eΔ8F\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e→ 1958\u003c\/li\u003e\n\u003cli class=\"p1\"\u003efactory identified by the symbol\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eΔ (Heerlen, Holland)\u003c\/b\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eA tube from the \"golden era\" Heerlen, with a long plate foil getter internal structure typical of early European production.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe specimen is in \u003cspan class=\"s2\"\u003e\u003cb\u003every good condition\u003c\/b\u003e\u003c\/span\u003e, tested in our laboratory with\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s2\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e, with a result of\u003cspan class=\"s2\"\u003e\u003cb\u003e\u003cspan\u003e VERY \u003c\/span\u003eSTRONG\u003c\/b\u003e\u003c\/span\u003e, stable sections and perfectly suitable even for sensitive circuit positions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSonic Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eHeerlen Long Plates from the late 1950s are appreciated for their broad, natural, and airy sound, with great harmonic coherence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBass:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eDeep, tight, and well-articulated. Excellent control without artificial emphasis.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMids:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003eBright and transparent, with excellent vocal rendition. Harmonics are rich but always balanced, with the naturalness typical of the Heerlen school.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHighs:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003eSilky and well-extended. The foil getter contributes to superior extension, with refined and never aggressive micro-detail.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDynamics:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003eReactive and fluid. Excellent transient response and stable behavior even on complex passages.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSoundstage:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003eWide and well-layered. Natural instrument separation and a credible, three-dimensional soundstage.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e🎧 Use in Hi-Fi Stereo Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003ehigh-end preamplifiers,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003etube line stages,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003evintage European and American amplification,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eDACs with tube stages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eParticularly suitable for jazz, vocal, acoustic music, and classical repertoire.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e🎸 Use in Musical Amplifiers\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eExcellent for vintage and boutique guitar amplifiers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eprogressive and musical break-up,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003erich harmonics,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003ebright and natural clean,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003econtrolled and warm crunch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eAlso perfectly suitable for V1 position thanks to\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s2\"\u003e\u003cb\u003eLow Noise \u0026amp; Low Microphonics\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e🎯 Note for Audiophiles and Collectors\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eHeerlen production 1958\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eFirst generation Long Plates Foil Getter\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eprofessional Amplitrex test\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eVERY STRONG emission\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eA tube of great historical and musical value, designed for those who desire the true Amperex sound signature of the late 1950s, to the full quality standard of Vacuum Tubes Treasures.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -2V\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1600 ; Ia = 1.2 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1670 ; Ia = 1.3 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1500 ; Ia = 1.2 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Very Low. Tested and compliant for use in hi-fi and guitar amplifiers. Compliant for use in V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections show consistent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003cspan\u003e NOS - New Old Stock - Tested and functional - Supplied in our custom box for optimal protection.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\n\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\n\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGood – Markings partially faded, but still legible. Tube body in good condition. See photos for details.\u003cstrong\u003e\u003cbr\u003e\n\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003emC6 \u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eΔ8F \u003c\/span\u003e- \u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eΔ8F\u003c\/span\u003e Δ → Heerlen (Holland), 8 (out of three digits) → 1958 - F → June\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":57236730413404,"sku":"03512","price":384000.0,"currency_code":"KRW","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_81ce316b-ff51-46d5-965f-9a0933fe0bba.jpg?v=1775647465","url":"https:\/\/vacuumtubestreasures.com\/en-kr\/products\/12ax7-ecc83-amperex-bugle-boy-amplitrex-tested-long-plates-foil-getter-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}