{"product_id":"12ax7-ecc83-nos-amperex-bugle-boy-short-plates-large-halo-getter-made-in-holland-60s","title":"12AX7 \/ ECC83 NOS AMPEREX Bugle Boy Short Plates Large Halo Getter MADE IN HOLLAND '60s","description":"\u003ch3\u003e\n\n\u003cstrong\u003e12AX7 \/ ECC83 NOS Amperex Bugle Boy Short Plates Large Halo Getter Tested Tubes \u003c\/strong\u003e\u003cstrong\u003eMADE IN HOLLAND '60s\u003c\/strong\u003e\n\n\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics – Vintage Heerlen Production\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 \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 = 1800 ; Ia = 1.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1600 ; Ia = 1.1 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: 48h – OK\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Very Low. Tested and compliant 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\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eFine example \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS 12AX7 \/ ECC83 Amperex Bugle Boy\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, produced at the historic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ePhilips factory in Heerlen, Netherlands, in February 1962\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The tube features the sought-after \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eShort Plates with Large Halo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction, characteristic of the highly regarded Dutch ECC83 tubes of this period, accompanied by the famous \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmperex Bugle Boy\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e screen printing. A particularly desirable combination for audiophiles and collectors seeking authentic vintage European tubes, expressing the prestigious Philips Heerlen manufacturing tradition.\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 \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVERY STRONG\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e electrical performance, with transconductances of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1800 and 1600 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, respectively, corresponding to 112.5% and 100% of the nominal reference of 1600. The average transconductance therefore reaches \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1700 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, 6.25% higher than the reference value. The anode currents are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1.2 and 1.1 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with an average of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1.15 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, extremely close to the nominal reference of 1.2 mA. The two sections show an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eoverall very good balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with a small transconductance difference and particularly close anode currents.\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 very strong and even emission, without fluctuations, short circuits, or the presence of gas. Particularly noteworthy is the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e selection, with very low noise and microphonic levels, verified during testing. An important feature for use in the most sensitive audio stages, where silence, stability, and emission quality are fundamental requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmperex Bugle Boy Short Plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e find application in hi-fi preamplifiers, compatible phono stages, integrated amplifiers, and guitar amplifiers, including input stages and phase inverter circuits compatible with the detected balance. The Philips Heerlen production of the 1960s is traditionally appreciated by audiophiles for a musical presentation generally described as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ewarm, natural, and harmonically refined\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with an expressive midrange, well-articulated bass, and open, detailed high frequencies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe value of this specimen lies in the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eauthentic NOS Amperex Bugle Boy production\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the sought-after \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eShort Plates with Large Halo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction, and the excellent documented electrical performance. The original engraved codes \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eI65 \/ ⊿2B2\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identify, according to their interpretation, a production at the Philips factory in Heerlen dating back to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003esecond week of February 1962\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The partially eroded, but still legible screen printing, and the good overall condition testify to the passage of time without compromising the verified functionality. An authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmperex Bugle Boy NOS Made in Holland\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, carefully tested and selected, for those seeking an original ECC83 with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every strong emission, low noise, and identifiable historical origin\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\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 NOS - New Old Stock - Tested and working - 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 Good – Lettering partially eroded, but still legible. Tube body in good condition. 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\u003e Amperex Bugle Boy ECC83 \/ 12AX7, produced at the Philips factory in Heerlen, Netherlands, datable to the second week of February 1962, according to the interpretation of the engraved production codes I65 \/ ⊿2B2.\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability, and longevity\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":59851978572124,"sku":"03928X","price":170.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_c00602c4-43a7-4b5a-b8a8-6d19eb529707.jpg?v=1794411787","url":"https:\/\/vacuumtubestreasures.com\/en-ch\/products\/12ax7-ecc83-nos-amperex-bugle-boy-short-plates-large-halo-getter-made-in-holland-60s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}