{"product_id":"12x4-tung-sol-nos-nib-black-plates-square-getter-tube-rectifier-made-in-usa-50s","title":"12X4 TUNG-SOL NOS NIB Black Plates Square Getter Tube Rectifier Made in USA '50s","description":"\u003cp\u003e\u003cstrong\u003e12X4 TUNG-SOL NOS NIB Black Plates Square Getter Tube Rectifier Made in USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"141\" data-end=\"514\"\u003e\u003cmeta charset=\"utf-8\"\u003e The 12X4 TUNG-SOL NOS NIB with black plates and a square getter, made in the USA in the 1950s, is one of the most reliable and refined grinders of its era. Supplied in its original vintage packaging (New In Box), it embodies the authentic American build quality that made TUNG-SOL famous: robustness, careful selection of materials, and a longevity that still fascinates collectors and enthusiasts today.\u003c\/p\u003e\n\u003cp data-start=\"516\" data-end=\"546\"\u003e\u003cstrong data-start=\"518\" data-end=\"544\"\u003eSound characteristics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"549\" data-end=\"653\"\u003e\u003cstrong data-start=\"549\" data-end=\"558\"\u003eBass\u003c\/strong\u003e : dry and defined, never invasive, with a control that gives coherence to the entire register.\u003c\/li\u003e\n\u003cli data-start=\"656\" data-end=\"764\"\u003e\u003cstrong data-start=\"656\" data-end=\"664\"\u003eMids\u003c\/strong\u003e : natural and well-balanced, with a linearity that guarantees neutrality and transparency to the signal.\u003c\/li\u003e\n\u003cli data-start=\"767\" data-end=\"853\"\u003e\u003cstrong data-start=\"767\" data-end=\"775\"\u003eHighs\u003c\/strong\u003e : clear but never sharp, with a balanced extension that avoids harshness.\u003c\/li\u003e\n\u003cli data-start=\"856\" data-end=\"981\"\u003e\u003cstrong data-start=\"856\" data-end=\"868\"\u003eDynamic\u003c\/strong\u003e : prompt and stable, capable of following load variations without giving in, returning controlled energy.\u003c\/li\u003e\n\u003cli data-start=\"984\" data-end=\"1149\"\u003e\u003cstrong data-start=\"984\" data-end=\"998\"\u003eSoundstage\u003c\/strong\u003e : it is not a valve that colors, but ensures a clean, stable and silent sound base, which allows the rest of the circuit to express itself at its best.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1151\" data-end=\"1467\"\u003e🎧 \u003cstrong data-start=\"1154\" data-end=\"1177\"\u003eUse in Hi-Fi Stereo\u003c\/strong\u003e \u003cbr data-start=\"1177\" data-end=\"1180\"\u003eIdeal for small preamplifiers and hi-fi tuners from the 1950s and 1960s, it ensures stable power supply and low background noise. Its tonal neutrality makes it perfect for restored vintage systems, where reliability and respect for the original sonic character are required.\u003c\/p\u003e\n\u003cp data-start=\"1469\" data-end=\"1720\"\u003e🎸 \u003cstrong data-start=\"1472\" data-end=\"1505\"\u003eUse in Music Amplifiers\u003c\/strong\u003e\u003cbr data-start=\"1505\" data-end=\"1508\"\u003eAlso popular in musical equipment and electronic instruments of the time, the 12X4 TUNG-SOL provides a smooth power supply that helps maintain the timbre faithful and without unwanted compression.\u003c\/p\u003e\n\u003cp data-start=\"1722\" data-end=\"2081\"\u003e🎯 \u003cstrong data-start=\"1725\" data-end=\"1757\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e\u003cbr data-start=\"1757\" data-end=\"1760\"\u003eAs a NOS NIB with black plates and a square getter, this rectifier represents a rare and sought-after variant, often favored for its sturdy construction and neutral tone balance. It's an excellent choice for philological restorations, collections, and applications where stability and historical authenticity are paramount.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia =\u003cmeta charset=\"utf-8\"\u003e 42 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 48 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 46 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\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 Very\u003cmeta charset=\"utf-8\"\u003e Low. Tested and approved for use in hi-fi and guitar amplifiers.\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 NOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in original box.\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\u003eAesthetic condition:\u003c\/strong\u003e Very good – Clearly legible writing with minor signs of wear, no obvious defects. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eUnreadable - Year of production deduced from the valve structure. Made in the 1950s.\u003c\/span\u003e\u003c\/li\u003e\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 durability\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"TUNG-SOL","offers":[{"title":"Default Title","offer_id":55490275770716,"sku":"03120","price":24.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_00fda6dc-96fe-4bcf-bf81-89b97bcc8976.jpg?v=1758043914","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/12x4-tung-sol-nos-nib-black-plates-square-getter-tube-rectifier-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}