{"product_id":"12bh7a-ge-matched-pair-gray-plates-horse-shoe-getter-usa-1960s-amplitrex-tested-1","title":"12BH7 GE Matched Pair Oval Gray Plates Horseshoe Getter USA 1960s AMPLITREX Tested","description":"\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12BH7 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 – VERY 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 \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 \u003c\/span\u003eVa = 250V, Vg = -10.5V\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAverage 100%:\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eGm = 3.10 ; Ia = 11.5 mA\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Result:\u003c\/b\u003e\u003c\/span\u003e VERY STRONG\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #1:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2.70 ; Ia = 9.6 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2.80 ; Ia = \u003cmeta charset=\"utf-8\"\u003e10.5 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #2:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e2.60 ; Ia = \u003cmeta charset=\"utf-8\"\u003e9.6 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e2.71 ; Ia = \u003cmeta charset=\"utf-8\"\u003e11.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\n\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\n\u003cli class=\"p2\"\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\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\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eBalance:\u003c\/b\u003e Very good. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eEmission Quality:\u003c\/b\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/li\u003e\n\n\u003cli class=\"p2\"\u003e\n\n\u003cb\u003eShorts and GAS:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e Absent.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3 class=\"p2\"\u003e\u003cb\u003eDescription:\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eInteresting \u003cstrong\u003eMatched Pair of 12BH7 General Electric\u003c\/strong\u003e, vintage American production attributable 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 GE's solid production during this period.\u003c\/p\u003e\n\u003cp\u003eThe two specimens show a slight variation in the getter support, clearly visible in the photographs, compatible with different construction configurations of GE production. The pair was selected based on the \u003cstrong\u003ecorrespondence of electrical values\u003c\/strong\u003e, a determining criterion for matching.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e12BH7\u003c\/strong\u003e is a double 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 represent an interesting choice for vintage hi-fi equipment and instrument amplifiers.\u003c\/p\u003e\n\u003cp\u003eThe tubes, \u003cstrong\u003eVintage Used but still electrically very strong\u003c\/strong\u003e, underwent \u003cstrong\u003e48 hours of burn-in \/ stability test\u003c\/strong\u003e and were subsequently tested in our laboratory using the \u003cstrong\u003eAmplitrex AT-1000 Tube Tester\u003c\/strong\u003e, obtaining a \u003cstrong\u003eVERY STRONG\u003c\/strong\u003e classification. The pair also resulted in \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e, with stable behavior and no anomalies detected.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eThe \u003cstrong\u003ebalance between sections is VERY GOOD\u003c\/strong\u003e, with consistent and well-aligned values. This characteristic, along with the \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e selection, makes the tubes particularly interesting for use as a \u003cstrong\u003ephase inverter\u003c\/strong\u003e, as well as in driver stages, line stages, and compatible hi-fi and instrumental applications.\u003c\/p\u003e\n\u003cp\u003eFrom a sonic perspective, vintage 12BH7A GE tubes are appreciated for a solid, dynamic, and natural presentation, with good bass presence, full and well-defined mids, and clean and controlled highs. The driving capability typical 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 fully functional. The aesthetic condition is adequate for their age and previous use, with partially faded or illegible silkscreen prints and clear signs of time.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eAn interesting \u003cstrong\u003eelectrically matched\u003c\/strong\u003e pair of authentic \u003cstrong\u003eGE 12BH7 Oval Gray Plates Horse Shoe Getter Made in USA\u003c\/strong\u003e, truly tested and selected by \u003cstrong\u003eVacuum Tubes Treasures\u003c\/strong\u003e, ideal for those seeking two vintage American 12BH7A tubes that are still strong, quiet, and reliable.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eCondition\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eCondition:\u003c\/b\u003e Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eFunctionality:\u003c\/b\u003e Fully operational.\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eAesthetic condition:\u003c\/b\u003e Sufficient – Markings completely gone. See photos for details.\u003c\/li\u003e\n\n\u003cli class=\"p2\"\u003e\n\n\u003cb\u003eManufacturing Code:\u003c\/b\u003e not decipherable. Production roughly attributable to the 1960s based on construction characteristics.\u003c\/li\u003e\n\n\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=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" 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":58855530070364,"sku":"03760Q","price":11500.0,"currency_code":"ISK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_2f0687ac-aa89-46ca-a5f5-62a1c0b768e3.jpg?v=1787926683","url":"https:\/\/vacuumtubestreasures.com\/en-is\/products\/12bh7a-ge-matched-pair-gray-plates-horse-shoe-getter-usa-1960s-amplitrex-tested-1","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}