{"product_id":"ez80-6v4-telefunken-ulm-plant-halo-getter-rectifier-tube-made-in-germany","title":"EZ80 \/ 6V4 TELEFUNKEN Ulm Diamond Bottom Halo Getter Rectifier Tube Made in Germany","description":"\u003cp class=\"p1\"\u003e\u003cb\u003eEZ80 \/ 6V4 TELEFUNKEN Ulm Plant Diamond Bottom Halo Getter Rectifier Tube Made in Germany – FUNKE Tested\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eMade in Germany – Ulm Plant – Diamond Bottom – Halo Getter – Tested VERY STRONG\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003eEZ80 \/ 6V4 Telefunken\u003c\/b\u003e\u003c\/span\u003e is a high-quality vintage rectifier tube, produced in Germany at the historic \u003cspan class=\"s1\"\u003e\u003cb\u003eTelefunken Ulm plant\u003c\/b\u003e\u003c\/span\u003e, recognizable by its code and the characteristic \u003cspan class=\"s1\"\u003e\u003cb\u003ediamond bottom\u003c\/b\u003e\u003c\/span\u003e etched on the glass between the pins.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe EZ80 \/ 6V4 is a 9-pin miniature rectifier widely used in radios, tuners, preamplifiers, vintage hi-fi amplifiers, and compatible circuits. In this Telefunken version, the neat internal construction, the \u003cspan class=\"s1\"\u003e\u003cb\u003ehalo getter\u003c\/b\u003e\u003c\/span\u003e, and German manufacturing quality contribute to making it a very interesting choice for accurate restorations and vintage audio applications.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe visible code \u003cspan class=\"s1\"\u003e\u003cb\u003eU7202602\u003c\/b\u003e\u003c\/span\u003e can be interpreted as \u003cspan class=\"s1\"\u003e\u003cb\u003eUlm\u003c\/b\u003e\u003c\/span\u003e production, June 27, likely \u003cspan class=\"s1\"\u003e\u003cb\u003e1962\u003c\/b\u003e\u003c\/span\u003e, an attribution cautiously made based on the tube type, internal construction, and the production context.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe tube is in \u003cspan class=\"s1\"\u003e\u003cb\u003egood overall aesthetic condition\u003c\/b\u003e\u003c\/span\u003e, with the Telefunken lettering still clearly visible and legible. Normal signs of age compatible with an original vintage tube are present. The glass is intact, the getter is well-preserved, and the diamond bottom represents an important element of Telefunken authenticity.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003eSonic Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThe rectifier does not intervene in the audio signal like a preamplification tube, but plays a fundamental role in the quality of the device's power supply, influencing its sound.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eIn compatible and correctly designed circuits, a stable rectifier like this can contribute to a sense of orderly and controlled bass, supporting the power supply without introducing noticeable instability.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMidrange\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003ePower supply stability helps preserve a natural and consistent midrange, with a fluid and well-balanced presentation, particularly appreciated in well-maintained vintage radios and hi-fi equipment.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTreble\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe overall response remains clean and composed, with a sense of order and finesse. The EZ80 Telefunken is among the most interesting rectifiers when one wishes to maintain the original character of the device without introducing unwanted alterations.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe very good and well-balanced electrical behavior contributes to a stable dynamic response. In compatible devices, this can translate into a more orderly reproduction, with good hold in the most articulated musical passages.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eIn vintage hi-fi applications, stable rectification can promote a more coherent and focused soundstage, with an orderly and well-controlled presentation, always depending on the device's design and the general condition of the circuit.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎧\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003eUse in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003eEZ80 \/ 6V4 Telefunken Ulm Plant\u003c\/b\u003e\u003c\/span\u003e is suitable for compatible devices that require an EZ80 \/ 6V4 rectifier, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003evintage radios\u003c\/li\u003e\n\u003cli\u003etuners\u003c\/li\u003e\n\u003cli\u003epreamplifiers\u003c\/li\u003e\n\u003cli\u003evintage hi-fi amplifiers\u003c\/li\u003e\n\u003cli\u003eaudio circuits compatible with EZ80 \/ 6V4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eIt is a particularly suitable choice when a high-quality level is desired, with an original German tube, tested and verified.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎸\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003eUse in Musical Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIn instrument equipment compatible with EZ80 \/ 6V4, this Telefunken can offer a stable and orderly response, useful when seeking reliability, control, and consistency in the power supply.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eAs always, usage must respect the electrical specifications of the device.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎯\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003eNote for Audiophiles and Technicians\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis tube represents an interesting selection for those looking for a true \u003cspan class=\"s1\"\u003e\u003cb\u003eTelefunken Made in Germany\u003c\/b\u003e\u003c\/span\u003e, with an \u003cspan class=\"s1\"\u003e\u003cb\u003eauthentic diamond bottom\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s1\"\u003e\u003cb\u003eUlm Plant\u003c\/b\u003e\u003c\/span\u003e production, \u003cspan class=\"s1\"\u003e\u003cb\u003ehalo getter\u003c\/b\u003e\u003c\/span\u003e, and very solid test values.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe test on \u003cspan class=\"s1\"\u003e\u003cb\u003eFunke W19\u003c\/b\u003e\u003c\/span\u003e yielded a very good and well-balanced result, allowing it to be offered as \u003cspan class=\"s1\"\u003e\u003cb\u003eTested VERY STRONG\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThis is not a generic EZ80 \/ 6V4, but an original Telefunken rectifier, verified and selected for those who desire construction quality, authenticity, and operational reliability in compatible circuits.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTube tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVa = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 53 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 49 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 49 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003cspan\u003e Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctionality:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePerfectly operational.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e Excellent – Lettering excellently preserved, minimal signs of age. See photos for details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Code: \u003c\/strong\u003eU7202602 → Ulm plant production, June 27, likely 1962 based on the tube type, internal construction, and Telefunken's production context at the time.\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 durability\" 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":"TELEFUNKEN","offers":[{"title":"Default Title","offer_id":57541776114012,"sku":"03569","price":21800.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_ec1166fa-313c-4913-82fd-84979fea574f.jpg?v=1777972247","url":"https:\/\/vacuumtubestreasures.com\/en-hu\/products\/ez80-6v4-telefunken-ulm-plant-halo-getter-rectifier-tube-made-in-germany","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}