{"product_id":"stk4191ii-sanyo-stereo-amplifier-hybrid-ic-50w-50w","title":"STK4191II Sanyo AF Amplifier Module","description":"\u003ch3\u003eHigh-Output 50W+50W Stereo Audio Power Amplifier Module\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eSTK4191II\u003c\/strong\u003e is the flagship thick-film hybrid integrated circuit from Sanyo's prestigious 4101II series. Engineered for split-rail power supplies, this module provides a consistent 50 Watts per channel, making it the definitive replacement part for flagship vintage receivers, high-power bookshelf systems, and integrated Hi-Fi amplifiers.\u003c\/p\u003e\n\n\u003cp\u003eThe \"Series II\" architecture features an optimized internal constant current circuit that ensures low harmonic distortion (0.4% THD) and high thermal stability. This module is prized by audio technicians for its ruggedness and the classic, musical warmth it brings to restored audio equipment.\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 = 0.4%).\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 high-fidelity from 20Hz to 50kHz (+0, -3dB).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e Recommended supply of ±35.5V (Absolute Maximum ±53V).\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\u003eTechnician's Installation Guide:\u003c\/h4\u003e\n\u003cp\u003eDue to its high 50W+50W output, the STK4191II generates significant heat during operation. It \u003cstrong\u003emust\u003c\/strong\u003e be securely mounted to a large heatsink using high-quality thermal silicone grease. Running this module without a heatsink—even for a few seconds of testing—will result in immediate and permanent internal substrate failure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003ePro Tip: Before installation, verify that the power supply rails are symmetrical and the filter capacitors are fully discharged. Always check the output emitter resistors for signs of overheating, as a previous speaker short is the most common cause of the original chip's failure.\u003c\/em\u003e\u003c\/p\u003e","brand":"Sanyo","offers":[{"title":"New","offer_id":48013255901338,"sku":"SC0008","price":26.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/9477\/8778\/files\/4-STK4191II_20Sanyo_20AF_20Amplifier_20Module.jpg?v=1778557017","url":"https:\/\/prellelectronics.com\/products\/stk4191ii-sanyo-stereo-amplifier-hybrid-ic-50w-50w","provider":"Prell Electronics","version":"1.0","type":"link"}