{"product_id":"7025-12ax7-ecc83-nos-raytheon-matched-pair-long-black-plates-halo-getter-tubes-usa","title":"7025 \/ 12AX7 \/ ECC83 NOS RAYTHEON Matched Pair Long Black Plates Halo Getter Tubes USA","description":"\u003ch3\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003e7025 \/ 12AX7 \/ ECC83 NOS Raytheon Matched Pair Long Black Plates Halo Getter Tubes \u003c\/strong\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\n\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics \u003cmeta charset=\"utf-8\"\u003e– Vintage American Raytheon Production\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e \u003c\/span\u003e\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 \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 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\"\u003e1600 ; Ia = \u003cmeta charset=\"utf-8\"\u003e1.1 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 = 1600 ; Ia = 1.1 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 = \u003cmeta charset=\"utf-8\"\u003e1.0 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 Very 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\u003ch3\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eExceptional NOS pair of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e7025 \/ 12AX7 \/ ECC83 Raytheon\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, produced in the United States in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1960\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and carefully selected as a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMatched Pair\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Both specimens feature the sought-after \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLong Black Plates with Halo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction, characteristic of Raytheon's American production during this period. The original codes \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e280C \/ 60-41 and 280C \/ 60-45\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identify two tubes manufactured in the 41st and 45th weeks of 1960, respectively. A particularly desirable pair for those seeking authentic NOS American tubes, united by the same construction design and a highly precise electrical match.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe measurements performed with the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e highlight a particularly significant uniformity. The transconductance of the four sections ranges between \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1500 and 1600 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with an identical average of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1550 µmhos for both tubes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, very close to the nominal reference of 1600. The anode currents are also perfectly matched in their averages, equal to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1.05 mA for each specimen\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with individual values ranging between 1.0 and 1.1 mA. This correspondence confirms an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eexcellent match between the two tubes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, accompanied by very good internal balance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBoth specimens 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 constant emission, without fluctuations, short circuits, or the presence of gas. The tests also confirmed \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every low noise and microphonic levels\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, which are particularly important for a tube like the 7025, also intended for the most sensitive amplification stages.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eRaytheon 7025 Long Black Plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e are particularly appreciated in hi-fi preamplifiers, compatible phono stages, and guitar amplifiers, even in the V1 position. Their good sectional balance also allows their use as a phase inverter in compatible circuits. Raytheon production from this period is traditionally sought after by audiophiles for a musical presentation generally described as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003enatural, detailed, and harmonically rich\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with an expressive midrange and pleasant dynamic articulation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe value of this pair lies in the combination of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eauthentic 1960 Raytheon production, Long Black Plates construction, NOS condition, and perfectly matched electrical averages\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The partially preserved original markings and good overall condition complete a set of particular interest. A \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecarefully selected vintage Raytheon Matched Pair\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, ideal for enthusiasts who desire original American tubes, with verified stability, extremely low noise, and rigorously documented electrical characteristics.\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\u003e\u003cspan\u003e NOS - New Old Stock - Tested and working - 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\u003eAesthetic condition:\u003c\/strong\u003e\u003cspan\u003e Good – Markings partially eroded, but still legible. Tube body in good condition. See photos for details.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e280C 60-41 → 280 → Raytheon Manufacturing Company, Waltham 54, Mass. ; \u003cmeta charset=\"utf-8\"\u003e60-41 → RMA\/EIA Open Date Code → manufactured in the 41st week of 1960\u003c\/li\u003e\n\n\u003cli\u003e280C 60-45 → 280 → Raytheon Manufacturing Company, Waltham 54, Mass. ; \u003cmeta charset=\"utf-8\"\u003e60-45 → RMA\/EIA Open Date Code → manufactured in the 45th week of 1960\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":"RAYTHEON","offers":[{"title":"Default Title","offer_id":59768598528348,"sku":"03916","price":1035.0,"currency_code":"RON","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_6a6f76d8-5ca6-4923-91a0-87061dcdf1e1.jpg?v=1793875250","url":"https:\/\/vacuumtubestreasures.com\/en-ro\/products\/7025-12ax7-ecc83-nos-raytheon-matched-pair-long-black-plates-halo-getter-tubes-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}