{"product_id":"12ax7-ecc83-amperex-bugle-boy-matched-pair-short-plates-large-halo-getter-made-in-holland-60s","title":"12AX7 \/ ECC83 AMPEREX Bugle Boy Matched Pair Short Plates Large Halo Getter MADE IN HOLLAND '60s","description":"\u003ch3\u003e\u003cstrong\u003e12AX7 \/ ECC83 AMPEREX Bugle Boy Short Plates Large Halo Getter Tested Tubes \u003c\/strong\u003e\u003cstrong\u003eMADE IN HOLLAND '60s\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e AMPLITREX Tested \u003cmeta charset=\"utf-8\"\u003e– STRONG – \u003cmeta charset=\"utf-8\"\u003eMatched Pair – Same Data Codes \u003cmeta charset=\"utf-8\"\u003e– Low Noise \u0026amp; Microphonics\u0026nbsp;\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\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e 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\u0026nbsp;STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1400 ; Ia = 0.8 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1500 ; Ia = 1.0 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1300 ; Ia = 0.7 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1500 ; Ia = 1.1 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: 48h – OK\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Very \u003cmeta charset=\"utf-8\"\u003eLow. Tested and suitable for use in hi-fi and guitar amplifiers. Suitable for use in V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections are not perfectly aligned. The tube is recommended for hi-fi use in non-critical stages (input or driver) and in guitar amplifiers. Not recommended as a phase inverter or in applications requiring strict balance between the sections.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Strong – Strong and even emission, suitable for any application.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort Circuits and GAS:\u003c\/strong\u003e 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 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\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\u003eShort Plates with Large Halo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction, characteristic of Amperex's Dutch production during this period. The engraved manufacturing codes \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eI62 \/ ⊿0B\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, common to the pair, suggest production dating back to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eFebruary 1960\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. A particularly interesting combination for audiophiles and collectors looking for authentic Bugle Boys from the same production era.\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\u003ea good overall electrical match\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The first tube has transconductances of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1400 and 1500 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, while the second measures \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1300 and 1500 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with averages of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1450 and 1400 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, respectively, compared to the nominal reference of 1600. The anode currents range from 0.7 to 1.1 mA, with an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eidentical average of 0.9 mA for both tubes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, compared to the reference of 1.2 mA. The matching is therefore particularly consistent in the average values, although there are differences between the individual sections, clearly documented by the measurements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBoth tubes have 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 strong and even 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, making the pair interesting even for the most sensitive input stages, including the V1 position in guitar amplifiers.\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, and guitar amplifiers. Given the differences between the sections, this pair \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eis not recommended for phase inverter circuits requiring strict symmetry\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Philips Heerlen production is traditionally appreciated by audiophiles for a musical presentation generally described as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003erefined, natural, 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 its \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eauthentic Amperex Bugle Boy Short Plates construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, matching production codes, and low-noise selection. The partially preserved screen printing and good overall condition attest to the vintage nature of the specimens, while instrumental testing documents their full current functionality. Two authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmperex Bugle Boy Made in Holland\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e tubes, carefully tested and matched, for those seeking vintage Dutch tubes with identifiable origin, documented 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 Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.\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 Good – Lettering partially eroded but still legible. Tube body in good condition. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Amperex \u003cmeta charset=\"utf-8\"\u003eBugle Boy ECC83 \/ 12AX7, produced at the Philips factory in Heerlen, Netherlands, probably in February 1960, according to the interpretation of the engraved production codes I62 \/ ⊿0B.\u003cbr\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\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":59850500309340,"sku":"03927","price":259.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_b0718804-ccb8-4dd5-9e8b-98f5033efc56.jpg?v=1794407978","url":"https:\/\/vacuumtubestreasures.com\/en-be\/products\/12ax7-ecc83-amperex-bugle-boy-matched-pair-short-plates-large-halo-getter-made-in-holland-60s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}