{"product_id":"ecc88-6dj8-hewlett-packard-heerlen-δ2l3-disc-dimpled-getter-matched-pair-molto-forte-made-in-holland-60s","title":"ECC88 \/ 6DJ8 HEWLETT PACKARD – Heerlen Δ2L3 – Disc Dimpled Getter – Matched Pair – VERY LOUD – Made in Holland '60s","description":"\u003cp\u003e\u003cstrong\u003eECC88 \/ 6DJ8 HEWLETT PACKARD – Heerlen Δ2L3 – Disc Dimpled Getter – Matched Pair – VERY LOUD – Made in Holland '60s\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp data-end=\"656\" data-start=\"396\"\u003e This matched pair of \u003cstrong data-end=\"463\" data-start=\"421\"\u003eHewlett Packard branded ECC88\/6DJ8s\u003c\/strong\u003e , produced in the historic \u003cstrong data-end=\"522\" data-start=\"501\"\u003eHeerlen (Holland)\u003c\/strong\u003e plant in the early 1960s (identical codes Δ2L3), represents a high-level industrial selection of the famous European double triode.\u003c\/p\u003e\n\n\u003cp data-end=\"828\" data-start=\"658\"\u003e The \u003cstrong data-end=\"700\" data-start=\"677\"\u003edisc dimpled getter\u003c\/strong\u003e construction is typical of Heerlen production of the period, synonymous with construction precision, electrical consistency and reliability over time.\u003c\/p\u003e\n\n\u003cp data-end=\"1103\" data-start=\"830\"\u003e The valves are used, in good aesthetic condition and consistent with their age, with no structural alterations.\u003cbr data-end=\"938\" data-start=\"935\"\u003e The presence of the Hewlett Packard brand adds an element of technical interest, as these valves were originally intended for instrumental and laboratory applications.\u003c\/p\u003e\n\n \u003cp data-end=\"1185\" data-start=\"1105\"\u003eTested in our lab on \u003cstrong data-end=\"1160\" data-start=\"1139\"\u003ethe Amplitrex AT-1000\u003c\/strong\u003e , they are rated VERY STRONG. Matching is consistent and stable, with uniform electrical behavior between the two units.\u003c\/p\u003e\n\n\u003ch3 data-end=\"1368\" data-start=\"1341\"\u003e \u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp data-end=\"1381\" data-start=\"1370\"\u003e \u003cstrong\u003eBass:\u003c\/strong\u003e Precise, controlled, and well-structured. They provide a solid foundation without artificial bloat, maintaining articulation and definition.\u003c\/p\u003e\n\n\u003cp data-end=\"1527\" data-start=\"1517\"\u003e \u003cstrong\u003eMids:\u003c\/strong\u003e Transparent and natural. The midrange is linear, with excellent clarity of vocals and correct harmonic reproduction of acoustic instruments.\u003c\/p\u003e\n\n\u003cp data-end=\"1686\" data-start=\"1676\"\u003e \u003cstrong\u003eHighs:\u003c\/strong\u003e Clean, extended, and well-finished. The top end is airy yet composed, with a fine grain typical of the Heerlen school.\u003c\/p\u003e\n\n\u003cp data-end=\"1818\" data-start=\"1804\"\u003e \u003cstrong\u003eDynamics:\u003c\/strong\u003e Lively and well-supported. Excellent microdynamics and prompt transient response, with always controlled behavior.\u003c\/p\u003e\n\n\u003cp data-end=\"1952\" data-start=\"1936\"\u003e \u003cstrong\u003eSoundstage:\u003c\/strong\u003e Stable and three-dimensional. Good separation of sound planes and precise focus.\u003c\/p\u003e\n\n \u003ch3 data-end=\"2079\" data-start=\"2047\"\u003e\u003cstrong\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp data-end=\"2278\" data-start=\"2081\"\u003e Ideal for medium-high and high quality preamplifiers, line stages, tube DACs and headphone amplifiers.\u003cbr data-end=\"2192\" data-start=\"2189\"\u003e Particularly suitable for those seeking neutrality, precision and operational stability.\u003c\/p\u003e\n\n\u003ch3 data-end=\"2330\" data-start=\"2285\"\u003e \u003cstrong\u003e🎸 Use in Technical and Musical Applications\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp data-end=\"2536\" data-start=\"2332\"\u003e The Hewlett Packard branding suggests a selection intended for measurement and laboratory contexts.\u003cbr data-end=\"2436\" data-start=\"2433\"\u003e Also excellent for professional equipment and studios where stability and consistency are essential.\u003c\/p\u003e\n\n\u003ch3 data-end=\"2577\" data-start=\"2543\"\u003e \u003cstrong\u003e🎯 Note for audiophiles and technicians\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli data-end=\"2635\" data-start=\"2581\"\u003e Authentic production Amperex Heerlen (Δ2L3 identical)\u003c\/li\u003e\n\n\u003cli data-end=\"2658\" data-start=\"2638\"\u003e Original 60s\u003c\/li\u003e\n\n\u003cli data-end=\"2682\" data-start=\"2661\"\u003e Disc dimpled getter\u003c\/li\u003e\n\n\u003cli data-end=\"2705\" data-start=\"2685\"\u003e Real Matched Pair\u003c\/li\u003e\n\n\u003cli data-end=\"2756\" data-start=\"2708\"\u003e Amplitrex Test Rating \u003cstrong data-end=\"2754\" data-start=\"2739\"\u003eVERY STRONG\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli data-end=\"2800\" data-start=\"2759\"\u003e Industrial origin Hewlett Packard\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp data-end=\"3006\" data-start=\"2802\"\u003e A pair that combines technical solidity, high output and historical authenticity, offering the typical Heerlen character in a stable, precise and reliable version, in true Vacuum Tubes Treasures style.\u003c\/p\u003e\n\n\u003chr\u003e\n\n \u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003e Tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eVoltage Test:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVa = 90V ; Vg = -1.2V \u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003c\/strong\u003e Gm = 12.5 ; Ia = 15.0 mA \u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e VERY STRONG\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e Section 1: Gm = 11.1 ; Ia = 11.4 mA\u003c\/li\u003e\n\n\u003cli\u003e Section 2: Gm = 11.2 ; Ia = 11.8 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e \u003cstrong\u003eValve 2:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e Section 1: Gm = 10.83 ; Ia = 10.2 mA\u003c\/li\u003e\n\n\u003cli\u003e Section 2: Gm = 10.2 ; Ia = 10.4 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and approved for use in hi-fi, phono stages, and guitar amplifiers, including V1.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e \u003cspan\u003eGood – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Δ2L3 →\u003cmeta charset=\"utf-8\"\u003e Δ → Heerlen (Holland), 2 (four digits) → 1962 - L → December - 3 → 3rd week of the month\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\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\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"HP","offers":[{"title":"Default Title","offer_id":56770115469660,"sku":"03428","price":149.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_2970cca1-7c84-4efb-9f9c-e7f64831df9f.jpg?v=1771505716","url":"https:\/\/vacuumtubestreasures.com\/en-si\/products\/ecc88-6dj8-hewlett-packard-heerlen-%ce%b42l3-disc-dimpled-getter-matched-pair-molto-forte-made-in-holland-60s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}