{"product_id":"5965-e180cc-nos-telefunken-ribbed-plates-diamond-bottom-made-in-germany","title":"5965 \/ E180CC NOS TELEFUNKEN Matched Pair Diamond Bottom Made in GERMANY","description":"\u003ch3\u003e\u003cstrong\u003e5965 \/ E180CC NOS TELEFUNKEN Diamond \u0026lt;\u0026gt; Bottom Made in GERMANY\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested \u003cmeta charset=\"utf-8\"\u003e– \u003cmeta charset=\"utf-8\"\u003eMatched Pair – Low Noise \u0026amp; Microphonics – Vintage \u003cmeta charset=\"utf-8\"\u003eTELEFUNKEN Production\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube Tester\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Test:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVa = 150V, Vg = -1.2V\u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eGm = 7.00 ; Ia = 10.0 mA\u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVERY\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eSTRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1\u003c\/strong\u003e: Gm = 9.70 ; Ia = 11.6 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2\u003c\/strong\u003e: Gm = 10.90 ; Ia = 13.9 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1\u003c\/strong\u003e: Gm = 10.70 ; Ia = 14.4 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2\u003c\/strong\u003e: Gm = 10.30 ; Ia = 13.6 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\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and compliant for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Good. The sections show consistent balance, fully compatible for 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\u003eShort Circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003ePrestigious \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS \/ NIB pair of 5965 – E180CC Telefunken\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, authentic German production from the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eUlm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e factory, immediately recognizable by the characteristic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ediamond embossed in the glass between the pins\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The two tubes come from different Telefunken batches, dated \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSeptember 6, 1965\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAugust 1, 1967\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, but share the same construction and have been selected together for their excellent electrical performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTests performed with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e show values significantly higher than the nominal reference of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e7.00 mA\/V\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The four sections actually measure between \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e9.70 and 10.90 mA\/V\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, confirming an exceptionally vigorous emission. The transconductance averages of the two tubes are particularly close: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e10.30 and 10.50 mA\/V\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with a difference of less than \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e2%\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, a characteristic that makes the pair optimally matched under the main parameter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAnode currents, between \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e11.6 and 14.4 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, also confirm energetic and steady operation. Overall balance is good, even if it does not represent an absolute symmetry selection between all sections. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48-hour burn-in\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e verified the stability of the parameters, without fluctuations, short circuits, or the presence of gas.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elow microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e make these Telefunkens suitable for preamplifiers, drivers, buffers, professional equipment, and measuring instruments designed for 5965 or E180CC, even in the most sensitive audio stages. The 5965\/E180CC has specific operating characteristics and must be used exclusively in circuits compatible with or expressly designed for this type of tube.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn terms of sound, the Telefunken Ulm production is appreciated for a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003etransparent, precise, and authoritative\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e reproduction, with a clean midrange, firm and articulated low frequencies, and extended highs without harshness. The remarkable transconductance of this pair contributes to a ready and dynamic response, while the coherence between the two specimens promotes image stability and uniformity between channels.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA high-level proposal for those looking for an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eauthentic Telefunken NOS\/NIB pair\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, complete with their boxes, original bottom diamond, documented Ulm origin, low microphonics, and electrical values significantly above average: two carefully tested, matched, and ready-to-use German 5965\/E180CC tubes.\u003c\/span\u003e\u003c\/p\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 NOS - NIB - New Old Stock, New In Box - Tested and functional - Supplied in Telefunken box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e\u003cspan\u003e Very Good – Markings are clearly legible with slight signs of age. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\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\u003eU6005904 – TELEFUNKEN production \u003cmeta charset=\"utf-8\"\u003eDiamond embossed in the glass between the pins, \u003cmeta charset=\"utf-8\"\u003eUlm factory - \u003cmeta charset=\"utf-8\"\u003eSeptember 6, \u003cmeta charset=\"utf-8\"\u003e1965\u003c\/li\u003e\n\u003cli\u003e\u003cmeta charset=\"utf-8\"\u003eU2207804 – TELEFUNKEN production Diamond embossed in the glass between the pins, Ulm factory - August 22, 1967\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 longevity\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"TELEFUNKEN","offers":[{"title":"Default Title","offer_id":59349912355164,"sku":"03864L","price":3153.0,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/12_c2ae2bd4-6c29-4175-8e42-be0cf566293c.jpg?v=1791121920","url":"https:\/\/vacuumtubestreasures.com\/en-hk\/products\/5965-e180cc-nos-telefunken-ribbed-plates-diamond-bottom-made-in-germany","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}