{"product_id":"ecc88-6dj8-philips-heerlen-δ2l3-d-getter-matched-pair-test-buono-made-in-holland-50s","title":"ECC88 \/ 6DJ8 Heerlen Δ9E (Philips Production) – D Getter – Matched Pair – Made in Holland '50s","description":"\u003cp\u003e\u003cstrong\u003eECC88 \/ 6DJ8 Heerlen Δ9E (Philips Production) – D Getter – Matched Pair – Made in Holland '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis matched pair of \u003cspan class=\"s1\"\u003e\u003cb\u003eECC88\/6DJ8 produced by Philips Heerlen (Δ9E)\u003c\/b\u003e\u003c\/span\u003e belongs to the first production phase of the Dutch factory, recognizable by the \u003cspan class=\"s1\"\u003e\u003cb\u003ethree-symbol code\u003c\/b\u003e\u003c\/span\u003e and the internal structure with \u003cspan class=\"s1\"\u003e\u003cb\u003eD-shaped getters\u003c\/b\u003e\u003c\/span\u003e , typical of the older versions.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe original silkscreen is no longer present, but the codes engraved in the glass consistently confirm Heerlen production.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe valves are used, in sound structural condition, with normal patina consistent with age.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eTested in our laboratory on \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e , they are classified as: GOOD\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe matching between the two units is functional and consistent for non-critical uses.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSound Character\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBass:\u003c\/strong\u003e Linear and controlled, without emphasis. Correct and natural reproduction.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMids:\u003c\/strong\u003e Open and transparent, with good intelligibility of voices and typical Philips Heerlen timbre setting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighs:\u003c\/strong\u003e Sweet and balanced. The top end is not aggressive and maintains a fine texture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDynamics:\u003c\/strong\u003e Progressive and smooth. Ideal for those seeking a less aggressive and more organic ride.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSoundstage:\u003c\/strong\u003e Coherent and uncluttered, with proper instrument separation.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eSuitable for preamplifiers, line stages, and vintage equipment where a balanced, not overly bright, output is desired. Not intended for high-end selections or applications requiring high output.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e🎸 Use in Music Applications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eInteresting in instrument circuits and contexts where a softer and more progressive response is appreciated, with natural compression.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e🎯 Note for audiophiles and technicians\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eAuthentic Philips Heerlen production (Δ9E)\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eD Getter first phase\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eVintage 50s\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eFunctional Matched Pair\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eA pair that offers the charm of older Heerlen production in an accessible configuration, designed for those who appreciate the historical and sonic character beyond pure numerical performance, in true Vacuum Tubes Treasures style.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester\u003c\/p\u003e\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 GOOD\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 8.68 ; Ia = 10.4 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = 8.5 ; Ia = 9.2 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eValve 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 8.68 ; Ia = 9.0 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = 9.47 ; Ia = 9.4 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/div\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 Low. Tested and approved for use in hi-fi, phono stages, and guitar amplifiers, including V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits 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\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\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e \u003cspan\u003eFair – Writing completely faded. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Δ9E →\u003cmeta charset=\"utf-8\"\u003e Δ → Heerlen (Holland), 9 (three digits) → 1959 - E → May\u003c\/li\u003e\n\u003c\/ul\u003e\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\u003cp\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"PHILIPS","offers":[{"title":"Default Title","offer_id":56770363326812,"sku":"03429","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_4675aa07-e7d3-4cb5-8a18-f91b087d50f9.jpg?v=1771510149","url":"https:\/\/vacuumtubestreasures.com\/en\/products\/ecc88-6dj8-philips-heerlen-%ce%b42l3-d-getter-matched-pair-test-buono-made-in-holland-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}