{"product_id":"12ax7-ecc83-tung-sol-long-gray-plates-halo-getter-matched-pair-tubes-usa-1960s","title":"12AX7 \/ ECC83 TUNG-SOL Matched Pair Long Gray Plates Halo Getter Tubes USA 1960s","description":"\u003ch3 data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e12AX7 \/ ECC83 TUNG-SOL Matched Pair Long Gray Plates Halo Getter Tubes MADE IN USA '60\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cb\u003eMatched Pair – AMPLITREX Tested – Low Noise \u0026amp; Microphonics – Vintage American TUNG-SOL Production\u003c\/b\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on \u003cstrong\u003eAMPLITREX AT-1000 \u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -2V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003e100% Average:\u003c\/strong\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eGm = 1600 ; Ia = 1.2 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1500 ; Ia = 1.0 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = \u003cmeta charset=\"utf-8\"\u003e1500 ; Ia = 0.9 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = \u003cmeta charset=\"utf-8\"\u003e1500 ; Ia = \u003cmeta charset=\"utf-8\"\u003e0.9 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = \u003cmeta charset=\"utf-8\"\u003e1300 ; Ia = \u003cmeta charset=\"utf-8\"\u003e0.9 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and suitable for use in hi-fi equipment and guitar amplifiers, including the most sensitive audio stages.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrument applications.\u003c\/span\u003e\u003c\/li\u003e\n\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\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort Circuits and GAS:\u003c\/strong\u003e None.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003c\/div\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eSelected vintage pair of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 Tung-Sol\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, made in the United States and carefully matched as a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMatched Pair\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Both specimens feature the characteristic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLong Gray Plates with Halo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction, attributable to the historic American Tung-Sol production of the 1960s. This configuration represents one of the most appreciated expressions of the American thermionic tradition, particularly interesting for audiophiles and musicians looking for authentic vintage tubes with original construction characteristics.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe measurements performed with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e show \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ehigh transconductance and good overall electrical uniformity\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The first tube shows identical values of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1500 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e in the two sections, while the second measures \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1500 and 1300 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e respectively, with averages of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1500 and 1400 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for the two specimens, compared to the nominal reference of 1600. The anode currents are between \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.9 and 1.0 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with particularly close averages of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.95 and 0.90 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, compared to the reference of 1.2 mA. The pair therefore has a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003econsistent matching\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with very homogeneous anode currents and a moderate difference in transconductance between the sections of the second tube, clearly documented by the measurements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBoth tubes have passed \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48 hours of burn-in and stability testing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, maintaining a very strong and steady emission, without fluctuations, short circuits, or the presence of gas. The tests also confirmed \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elow noise and microphonics levels\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, important characteristics for use in sensitive audio stages, where silence and reliable performance are fundamental requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 Tung-Sol Long Gray Plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e find application in hi-fi preamplifiers, compatible phono stages, and guitar amplifiers, including input stages and phase inverter circuits compatible with the detected balance. American Tung-Sol production from this period is traditionally appreciated by audiophiles for a musical presentation generally described as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edynamic, detailed, and harmonically rich\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with a wide expressive midrange, good articulation, and a pleasant tonal naturalness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe value of this pair lies in its \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eauthentic Tung-Sol Long Gray Plates construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, documented electrical characteristics, and low-noise selection. The absence of decipherable manufacturing codes does not allow for precise dating, although the construction characteristics are attributable to American production from the 1960s. The partially faded screen printing and signs of age testify to the vintage nature of the specimens, while instrumental tests confirm their full current functionality. Two authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003evintage American Tung-Sol\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e tubes, carefully tested and matched, for those seeking original tubes with verified electrical performance and the charm of historic American production.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCondition: \u003c\/strong\u003eVintage Tubes - Tested and perfectly functional. Supplied 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\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Adequate – Partially faded or barely legible lettering, overall appearance with evident signs of age. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code: \u003c\/strong\u003eUndecipherable code. Production attributable approximately to the 1960s based on construction characteristics.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability, and longevity\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"TUNG-SOL","offers":[{"title":"Default Title","offer_id":59829668577628,"sku":"03924","price":470.0,"currency_code":"ILS","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_184b8d26-346e-4cb3-89f8-2243db1659a2.jpg?v=1794327618","url":"https:\/\/vacuumtubestreasures.com\/en-il\/products\/12ax7-ecc83-tung-sol-long-gray-plates-halo-getter-matched-pair-tubes-usa-1960s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}