{"product_id":"12ax7-ecc83-tungsram-short-gray-plate-dual-post-halo-getter-tube-made-in-hungary","title":"12AX7 \/ ECC83 TUNGSRAM Short Gray Plate Dual Post Halo Getter Tube Made in Hungary","description":"\u003ch3\u003e\u003cstrong\u003e12AX7 \/ ECC83 TUNGSRAM Short Gray Plate Dual Post Halo Getter Tube Made in Hungary\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested \u003cmeta charset=\"utf-8\"\u003e– VERY STRONG – Low Noise \u0026amp; Microphonics – Vintage Tungsram Production\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on an \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube 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 \u003c\/span\u003eGm = 1600 ; Ia = 1.2 mA\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 :\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 = 1900 ; Ia = 1.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1700 ; Ia = 1.0 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\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 confirmed for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Good. The sections show consistent balance, fully compatible for use in hi-fi settings and musical amplifiers, in all applications where absolute symmetry between sections is not required.\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\u003ch3\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eThis \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 Tungsram Made in Hungary\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is an interesting example of European tube production, attributable roughly to the 1960s. The internal construction features \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eshort gray plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, a dual-post getter support, and an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ehalo getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, features consistent with Tungsram production of that era.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe manufacturing code and external silk-screening are no longer visible; the attribution to the manufacturer and period is therefore based on the specimen's construction characteristics. The internal structure is intact and clearly identifiable, while the absence of markings is reported with full transparency and documented in the photographs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAfter a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48-hour burn-in\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e cycle, the tube was tested with an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, recording \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 1900 with Ia 1.2 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for the first section and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 1700 with Ia 1.0 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for the second. Both sections exceed the nominal transconductance reference, confirming \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every strong, stable emission free of fluctuations\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe balance is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003egood\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with consistent values for both Gm and anode current. The tube is fully suitable for input stages, drivers, and preamplification in hi-fi equipment and guitar amplifiers, in all applications where absolute symmetry between sections is not required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elow noise and microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e selection allows its use even in the most sensitive audio stages. Sonically, Tungsram production is appreciated for a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edynamic, defined, and natural\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e presentation, with good mid-range presence, controlled bass, and clear yet well-integrated high frequencies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003evintage European 12AX7 \/ ECC83\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e that is particularly excellent electrically: emission above the nominal reference, good coherence between sections, and silent operation. Although the markings are completely absent, the tube has been carefully tested, is perfectly operational, and is free of short circuits or gas.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003cspan\u003e Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.\u003c\/span\u003e\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\u003eCosmetic Condition:\u003c\/strong\u003e\u003cspan\u003e Fair – See photos for details.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Absent. Production is roughly attributable to the 1960s based on construction characteristics.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"TUNGSRAM","offers":[{"title":"Default Title","offer_id":59589397840220,"sku":"03883","price":69.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_cbc9833d-6954-40b3-b248-36c1bf33adb4.jpg?v=1792416787","url":"https:\/\/vacuumtubestreasures.com\/en-nl\/products\/12ax7-ecc83-tungsram-short-gray-plate-dual-post-halo-getter-tube-made-in-hungary","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}