{"product_id":"12ax7-ecc83-tung-sol-long-gray-plates-halo-getter-balanced-low-noise-mic-tube-usa-1960s","title":"12AX7 \/ ECC83 TUNG-SOL Long Gray Plates Halo Getter - Balanced - Low Noise \u0026 Mic Tube USA 1960s","description":"\u003ch3 data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e12AX7 \/ ECC83 TUNG-SOL Long Gray Plates Halo Getter Tube USA 1960s\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e\u003cb\u003eAMPLITREX Tested – Low Noise \u0026amp; Microphonics – Balanced \u003cmeta charset=\"utf-8\"\u003e– 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 STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube:\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 = 1300 ; Ia = 0.8 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\"\u003e0.8 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 Ultra 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 Excellent - 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 Strong – Strong and even emission, suitable for any application.\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 specimen 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 featuring the refined \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 production of the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1960s\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. This configuration represents one of the expressions of the Tung-Sol thermionic tradition, particularly interesting for audiophiles and musicians looking for authentic vintage American tubes, built according to the quality standards of the original production.\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 highlight an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eexcellent electrical balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with perfectly identical values in the two sections. The transconductance reaches \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1300 µmhos for both triodes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, corresponding to 81.25% of the nominal reference of 1600, while the anode currents are uniform at \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.8 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, compared to the reference of 1.2 mA. Although the values are lower than the nominal references, the perfect correspondence of the measurements confirms a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eparticularly accurate internal symmetry\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, an appreciable feature in applications requiring electrically balanced sections.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tube 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 strong and even emission, without fluctuations, short circuits, or the presence of gas. A particularly significant element is represented by the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eextremely low noise and microphonics levels\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, verified during testing. This selection makes the specimen particularly interesting for the most sensitive audio stages, where silence and stability 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. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eidentity of the electrical characteristics of the two sections\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e constitutes a favorable element in applications requiring a good internal balance. The American Tung-Sol production of 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 medium expressive range and good tonal articulation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe value of this specimen lies in its \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eauthentic Tung-Sol Long Gray Plates construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the excellent balance of the sections, and, above all, the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eultra-low noise selection\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The absence of decipherable manufacturing codes does not allow for precise dating, although the construction features are attributable to the American production of the 1960s. The partially faded screen printing and obvious signs of age testify to the vintage nature of the tube, while instrumental tests document its full current functionality. An authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003evintage American Tung-Sol\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, carefully tested and selected, for those seeking an original tube with documented electrical characteristics, verified stability, and extremely low microphonics.\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 markings, overall aesthetics with obvious 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\u003eCode not decipherable. Production attributable approximately to the 1960s based on construction features.\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":59834886455644,"sku":"03925","price":354.0,"currency_code":"RON","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_0b6ecaba-0910-4476-81e8-ca6318d0fcc5.jpg?v=1794333517","url":"https:\/\/vacuumtubestreasures.com\/en-ro\/products\/12ax7-ecc83-tung-sol-long-gray-plates-halo-getter-balanced-low-noise-mic-tube-usa-1960s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}