{"product_id":"stk4121ii-sanyo-stereo-amplifier-hybrid-ic-15w-15w","title":"STK4121II Sanyo AF Amplifier Module","description":"\u003ch3\u003eReliable 15W Stereo Audio Power Amplifier Module\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eSTK4121II\u003c\/strong\u003e is a classic thick-film hybrid integrated circuit manufactured by Sanyo. Designed for split-rail power supplies, this module provides a consistent 15W + 15W stereo output. It is the industry-standard replacement part for restoring audio in vintage compact systems, bookshelf stereos, and mid-range integrated amplifiers.\u003c\/p\u003e\n\n\u003cp\u003eThe \"Series II\" architecture features an improved internal constant current circuit that ensures low harmonic distortion (0.4% THD) and high thermal stability, providing the warm, musical characteristics Sanyo hybrid chips are known for.\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 15W + 15W (at 8Ω, THD = 0.4%)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 2-Channel Stereo (18-Pin SIP Package).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e Full-range audio from 20Hz to 50kHz.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e Recommended ±20V (Absolute Maximum ±30V).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in Muting:\u003c\/strong\u003e Integrated circuitry to suppress power-on\/off shock noise (\"pops\").\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation \u0026amp; Thermal Management:\u003c\/h4\u003e\n\u003cp\u003eThe STK4121II \u003cstrong\u003erequires\u003c\/strong\u003e a dedicated heatsink and high-quality thermal grease for safe operation. Because the internal transistors are bonded directly to the substrate, operating the module without a heatsink—even for a brief functional test—will cause immediate and permanent internal failure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eTechnician's Note: Before installing, verify that the power supply rails are symmetrical and do not exceed ±20V. Check the output emitter resistors for signs of overheating, as a short in the speaker terminals is the most common cause of the original chip's failure.\u003c\/em\u003e\u003c\/p\u003e","brand":"Sanyo","offers":[{"title":"New","offer_id":48006074892442,"sku":"SC0007","price":19.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/9477\/8778\/files\/27-STK4121II_20Sanyo_20AF_20Amplifier_20Module.jpg?v=1778389448","url":"https:\/\/prellelectronics.com\/products\/stk4121ii-sanyo-stereo-amplifier-hybrid-ic-15w-15w","provider":"Prell Electronics","version":"1.0","type":"link"}