{"product_id":"stk4191x-sanyo-audiophile-stereo-amplifier-22-pin-50w","title":"STK4191X Sanyo AF Power Amplifier","description":"\u003ch3\u003eElite 50W+50W Audiophile Stereo Power Amplifier Module (22-Pin)\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eSTK4191X\u003c\/strong\u003e is the master-grade flagship of Sanyo’s thick-film hybrid series. While standard modules in this family offer 0.4% distortion, the \"X\" (Series 10) is engineered for absolute sonic purity, achieving an ultra-low Total Harmonic Distortion (THD) of just \u003cstrong\u003e0.02%\u003c\/strong\u003e. This 22-pin module is the definitive choice for high-end vintage Japanese receivers and studio-grade integrated amplifiers.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing a sophisticated internal current mirror and cascode stage, the STK4191X provides a silent noise floor and transparent soundstage that rivals discrete transistor designs. This is a rare, high-performance component intended for \"no-compromise\" audio restorations.\u003c\/p\u003e\n\n\u003ch4\u003eKey Technical Features:\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuous Power Output:\u003c\/strong\u003e 50W + 50W (at 8Ω, 20Hz to 20kHz, THD = 0.02%).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReference-Grade Distortion:\u003c\/strong\u003e 0.02% THD provides studio-quality transparency.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpecialized Package:\u003c\/strong\u003e 22-Pin SIP (Single In-line Package) for enhanced mechanical stability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Muting:\u003c\/strong\u003e Built-in circuitry to prevent power-on\/off speaker \"thump.\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e Recommended supply of ±35.5V (Absolute Maximum ±54V).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThermal Excellence:\u003c\/strong\u003e Optimized substrate bonding for high reliability at 50W per channel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation \u0026amp; Compatibility Note:\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e This is the 22-pin version of the STK4191. It is designed for specific high-end PCB layouts and is not a direct physical drop-in for standard 18-pin boards without modification. \u003c\/p\u003e\n\n\u003cp\u003eDue to the high-precision architecture of the STK4191X, it \u003cstrong\u003emust\u003c\/strong\u003e be securely mounted to a high-mass heatsink with premium thermal grease. Operating this module without a heatsink—even for a few seconds—will cause immediate and permanent internal substrate failure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eTechnician's Tip: Before installation, check for symmetrical power rails and verify that your output emitter resistors are intact. For the best performance from this Series X chip, ensure your filter capacitors are in peak condition to maintain the 0.02% distortion spec.\u003c\/em\u003e\u003c\/p\u003e","brand":"Sanyo","offers":[{"title":"New","offer_id":48013255999642,"sku":"SC0008","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/9477\/8778\/files\/7-STK4191X_20Sanyo_20AF_20Power_20Amplifier.jpg?v=1778557023","url":"https:\/\/prellelectronics.com\/products\/stk4191x-sanyo-audiophile-stereo-amplifier-22-pin-50w","provider":"Prell Electronics","version":"1.0","type":"link"}