{"product_id":"12ax7-ecc83-bladwin-by-raytheon-matched-pair-long-black-plates-halo-getter-tubes-usa","title":"12AX7 \/ ECC83 Baldwin by RAYTHEON Matched Pair Long Black Plates Halo Getter Tubes USA","description":"\u003ch3\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003e12AX7 \/ ECC83 Baldwin by RAYTHEON Matched Pair Long Black Plates Halo Getter\u0026nbsp; Tubes \u003c\/strong\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\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\u0026nbsp;\u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;Va = 250V ; Vg = -2V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e100% Average:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1600 ; Ia = 1.2 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\u003eTube #10:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1600 ; Ia = 1.1 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = \u003cmeta charset=\"utf-8\"\u003e1500 ; Ia = \u003cmeta charset=\"utf-8\"\u003e1.0\u0026nbsp;mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #7:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1600 ; Ia = \u003cmeta charset=\"utf-8\"\u003e1.0 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = \u003cmeta charset=\"utf-8\"\u003e1600 ; Ia = \u003cmeta charset=\"utf-8\"\u003e1.1 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e\u0026nbsp;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\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. The sections are consistent and well-matched, making the tube suitable for use as a phase inverter in hi-fi and instrument applications.\u003c\/span\u003e\u003c\/li\u003e\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\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort Circuits and GAS:\u003c\/strong\u003e\u0026nbsp;None.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\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 Baldwin by Raytheon\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, produced in the United States in the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1960s\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 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 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 American Raytheon production from this period. Originally marketed under the Baldwin brand, these tubes retain the construction identity of the historic Raytheon builds, particularly appreciated by audiophiles and musicians looking for authentic vintage American tubes.\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 accurate electrical match. The transconductance of the four sections is between \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1500 and 1600 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with averages of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1550 and 1600 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for the respective tubes, very close to the nominal reference of 1600. The anode currents vary from 1.0 to 1.1 mA, with an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eidentical average of 1.05 mA for both tubes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, compared to the reference of 1.2 mA. This uniformity, accompanied by a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every good internal balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, confirms the quality of the match and the consistency of the electrical characteristics.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBoth tubes 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 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 regularity of performance take on particular value.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 Raytheon Long Black Plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e find application in hi-fi preamplifiers, compatible phono stages, and guitar amplifiers, including input sections and phase inverter circuits. Raytheon production from this period is traditionally appreciated 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 good dynamic articulation.\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 Raytheon Long Black Plates construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the accuracy of the match, and the documented electrical performance. The code \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eP28061-01C\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifies a specimen produced in the first week of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1961\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, while the other, lacking legible markings, features corresponding construction characteristics, attributable to the same historical period. The different conditions of the silkscreens testify to the vintage nature of the pair, without compromising its verified functionality. Two authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmerican Baldwin by Raytheon\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e tubes, carefully tested and selected, for those seeking vintage tubes with homogeneous electrical characteristics and verified stability.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\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\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u0026nbsp;\u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e\u003cspan\u003e One tube with partially eroded lettering, but still legible. Tube body in good condition. See photos for details. - One tube with completely absent lettering. Tube body in good condition. See photos for details.\u0026nbsp;\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eP28061-01C → 280 → Raytheon Manufacturing Company, Waltham 54, Mass. ; \u003cmeta charset=\"utf-8\"\u003e61-01 → RMA\/EIA Open Date Code → manufactured in the 1st week of 1961\u003c\/li\u003e\n\u003cli\u003eIndecipherable code. Production attributable approximately to the 1960s based on construction characteristics.\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 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":59769837060444,"sku":"03917","price":149.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_044e86e2-ae80-4406-a277-062bbf9e4b22.jpg?v=1793879175","url":"https:\/\/vacuumtubestreasures.com\/en-nl\/products\/12ax7-ecc83-bladwin-by-raytheon-matched-pair-long-black-plates-halo-getter-tubes-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}