{"product_id":"5v4g-gz32-rca-st-shape-black-plates-bottom-square-getter-tested-tube-made-in-usa","title":"5V4G GZ32 RCA ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '58","description":"\u003cp\u003e\u003cstrong\u003e5V4G GZ32 RCA ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '58\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e5V4G \/ GZ32 RCA\u003c\/strong\u003e, in this refined 1958 version with \u003cstrong\u003eST bottle\u003c\/strong\u003e, \u003cstrong\u003esymmetrical black plates\u003c\/strong\u003e, and \u003cstrong\u003ebottom square getter\u003c\/strong\u003e, represents one of the most balanced and musical options among classic American rectifiers for hi-fi applications. Built with the care typical of RCA’s golden years, it combines \u003cstrong\u003eelectrical robustness, low noise operation, and refined tonal performance\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eEspecially appreciated in systems with sensitive power supplies or vintage integrated amplifiers, this tube is ideal for those seeking \u003cstrong\u003estable voltage\u003c\/strong\u003e, \u003cstrong\u003esmooth startup\u003c\/strong\u003e, and a sound output that preserves the natural character of the audio signal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBass\u003c\/strong\u003e: tight and extended. The low-end response is more precise and defined compared to other contemporary 5V4G models, with good hold even under dynamic load conditions. It delivers \u003cstrong\u003efirm and musical bass\u003c\/strong\u003e, capable of authoritatively supporting the harmonic foundation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMidrange\u003c\/strong\u003e: transparent and neutral. The mid frequencies are \u003cstrong\u003edry but not cold\u003c\/strong\u003e, with excellent vocal clarity and a natural rendering of acoustic instruments. No tonal coloration, just a clarity that enhances the system’s timbral coherence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighs\u003c\/strong\u003e: open and discreet. The top end extends with \u003cstrong\u003efineness and control\u003c\/strong\u003e, without harshness or roughness. Details emerge with \u003cstrong\u003erefinement\u003c\/strong\u003e, revealing micro-information without ever becoming intrusive.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDynamics\u003c\/strong\u003e: fluid and responsive. The tube \u003cstrong\u003etracks transients well\u003c\/strong\u003e, with energetic yet never edgy behavior. The dynamic response is \u003cstrong\u003elinear and progressive\u003c\/strong\u003e, enhancing both delicate passages and those requiring more energy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSoundstage\u003c\/strong\u003e: well-organized and deep. The stereo image is \u003cstrong\u003estable, centered, and coherent\u003c\/strong\u003e, with good layering and a three-dimensional presentation that respects the spatial integrity of the music.\u003c\/p\u003e\n\u003cp\u003e🎧\u0026nbsp;\u003cstrong\u003eUse in Headphone Amplifiers and Hi-Fi Driver Stages\u003c\/strong\u003e\u003cbr\u003eIdeal for tube preamps, DACs with tube rectification, or headphone amps with medium-high impedance. Thanks to its \u003cstrong\u003eelectrical transparency\u003c\/strong\u003e and \u003cstrong\u003elow noise emission\u003c\/strong\u003e, this tube performs without introducing coloration, enhancing detail and microdynamics even in reference-grade systems.\u003c\/p\u003e\n\u003cp\u003e🎸 \u003cstrong\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003cbr\u003eOccasionally used in \u003cstrong\u003emid-range American amps from the 1950s\u003c\/strong\u003e, this 5V4G contributes to a \u003cstrong\u003esoft and musical sag\u003c\/strong\u003e, with a non-aggressive dynamic response. Ideal for jazz, blues, studio cleans, and genres that favor \u003cstrong\u003enatural compression and controlled attack\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e🎯 \u003cstrong\u003eNote for Audiophiles and Technicians\u003c\/strong\u003e\u003cbr\u003eA \u003cstrong\u003ebalanced and uncompromising\u003c\/strong\u003e tube, perfect for those seeking a rectifier that is \u003cstrong\u003etransparent, stable, and technically flawless\u003c\/strong\u003e. The ST design with bottom square getter and symmetrical black plates also makes it a \u003cstrong\u003epremium choice for vintage restorations\u003c\/strong\u003e, both sonically and aesthetically.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTube tested\u003c\/strong\u003e on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Test:\u003c\/strong\u003e Va = 60V, Vf = 5V\u003cbr\u003e\u003cstrong\u003eGood from:\u003c\/strong\u003e Ia = 55 mA\u003cbr\u003e\u003cstrong\u003e100% Average:\u003c\/strong\u003e Ia = 84.6 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT:\u003c\/strong\u003e VERY STRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube Readings:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1\u003c\/strong\u003e: Ia = 82 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2\u003c\/strong\u003e: Ia = 80 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\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low Noise \u0026amp; Microphonics – Tested and suitable for hi-fi systems and guitar amps.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, no fluctuations.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e None.\u003c\/li\u003e\n\u003c\/ul\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 tube – Tested and fully functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully operational.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Very Good – Legible print with minor signs of age, some smearing on the logo silkscreen. See photos for details.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFactory Code:\u003c\/strong\u003e K2 – RCA Manufacturing. March-April 1958.\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\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":54737030316380,"sku":"02969U","price":74.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_2efd1100-0d75-4d3f-8a5c-1dffb00c8253.jpg?v=1749722152","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/5v4g-gz32-rca-st-shape-black-plates-bottom-square-getter-tested-tube-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}