{"product_id":"12bh7a-ge-matched-pair-gray-plates-horse-shoe-getter-usa-1960s-amplitrex-tested","title":"12BH7A GE Matched Pair Gray Plates Horse Shoe Getter USA 1960s AMPLITREX Tested","description":"\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12BH7A GE Oval Gray Plates Horse Shoe Getter – Matched Pair – Made in USA – 1960s\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Tested – STRONG – Low Noise \u0026amp; Microphonics – Vintage American General Electric Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Results\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003eTubes tested on\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eTest Conditions:\u003c\/b\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eVa = 250V, Vg = -10.5V\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAverage 100%:\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 3.1 ; Ia = 11.5 mA\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Result:\u003c\/b\u003e\u003c\/span\u003e\u0026nbsp;STRONG\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #1:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003eGm = 2.70 ; Ia = 10.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003eGm = 2.40 ; Ia = \u003cmeta charset=\"utf-8\"\u003e7.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #2:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003eGm = \u003cmeta charset=\"utf-8\"\u003e2.80 ; Ia = \u003cmeta charset=\"utf-8\"\u003e13.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003eGm = \u003cmeta charset=\"utf-8\"\u003e2.41 ; Ia = \u003cmeta charset=\"utf-8\"\u003e10.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAdditional tests performed\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p2\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eMicrophonics:\u003c\/b\u003e Low. Tested and suitable for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eBalance:\u003c\/b\u003e The sections are not perfectly aligned. The tube is suitable for use in non-critical hi-fi stages (input or driver) and in guitar amplifiers. Not recommended as a phase inverter or in applications requiring strict balance between sections.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eEmission Quality:\u003c\/b\u003e Strong – Strong and regular emission, suitable for any application.\u003c\/li\u003e\n\u003cli class=\"p2\"\u003e\u003cb\u003eShorts and GAS:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"p2\"\u003e\u003cb\u003eDescription:\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eInteresting \u003cstrong\u003eMatched Pair of 12BH7A General Electric\u003c\/strong\u003e, vintage American production attributed to the \u003cstrong\u003e1960s\u003c\/strong\u003e, characterized by the classic \u003cstrong\u003eOval Gray Plates with Horse Shoe Getter\u003c\/strong\u003e construction, representative of the solid GE production of this period.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e12BH7A\u003c\/strong\u003e is a dual triode particularly appreciated in driver and line stages due to its good driving capability, robustness, and operational stability. These \u003cstrong\u003eGeneral Electric Made in USA\u003c\/strong\u003e specimens retain the typical construction of American productions of the era and represent an interesting choice for both vintage hi-fi equipment and instrument amplifiers.\u003c\/p\u003e\n\u003cp\u003eThe tubes, \u003cstrong\u003eused but still electrically strong\u003c\/strong\u003e, have undergone \u003cstrong\u003e48 hours of burn-in \/ stability testing\u003c\/strong\u003e and subsequently tested in our laboratory using the \u003cstrong\u003eAmplitrex AT-1000 Tube Tester\u003c\/strong\u003e, achieving a \u003cstrong\u003eSTRONG\u003c\/strong\u003e rating. The pair was selected as a \u003cstrong\u003eMatched Pair\u003c\/strong\u003e based on good transconductance consistency between the two tubes and was found to be \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e, with stable behavior and no anomalies detected.\u003c\/p\u003e\n\u003cp\u003eThe internal sections, however, do not exhibit sufficiently rigorous balancing for applications requiring two perfectly symmetrical triodes. For this reason, the pair is recommended for \u003cstrong\u003edriver stages, line stages, and other non-critical positions\u003c\/strong\u003e, as well as in guitar amplifiers, while it is not the ideal choice as a \u003cstrong\u003ephase inverter\u003c\/strong\u003e when a strict balance between sections is required.\u003c\/p\u003e\n\u003cp\u003eSonically, vintage 12BH7A GE tubes are appreciated for a solid, dynamic, and natural presentation, with good presence in the bass range, full and well-defined mids, and clean and controlled highs. The typical driving capability of the 12BH7 contributes to energetic and authoritative reproduction in equipment designed for this tube.\u003c\/p\u003e\n\u003cp\u003eThe tubes are \u003cstrong\u003eVintage Used\u003c\/strong\u003e, carefully tested and perfectly functional. Aesthetic conditions are adequate for their age and previous use, with partially faded or barely legible silk screening and evident signs of time.\u003c\/p\u003e\n\u003cp\u003eAn interesting matched pair of authentic \u003cstrong\u003eGE 12BH7A Oval Gray Plates Horse Shoe Getter Made in USA\u003c\/strong\u003e, genuinely tested and selected by \u003cstrong\u003eVacuum Tubes Treasures\u003c\/strong\u003e, ideal for those seeking a strong, quiet, and reliable pair of vintage American 12BH7A tubes.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eConditions\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eConditions:\u003c\/b\u003e Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eFunctionality:\u003c\/b\u003e Perfectly operational.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eCosmetic conditions:\u003c\/b\u003e Adequate – Partially faded or barely legible lettering, overall aesthetics with evident signs of time. See photos for details.\u003c\/li\u003e\n\u003cli class=\"p2\"\u003e\u003cb\u003eManufacturing Code:\u003c\/b\u003e not decipherable. Production roughly attributable to the 1960s based on constructive characteristics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan class=\"s2\"\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\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":58853745328476,"sku":"03759","price":610.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_3cf8bcfa-43f8-478e-ba0d-ceb1e29cd455.jpg?v=1787922124","url":"https:\/\/vacuumtubestreasures.com\/en-dk\/products\/12bh7a-ge-matched-pair-gray-plates-horse-shoe-getter-usa-1960s-amplitrex-tested","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}