{"product_id":"stk4211ii-sanyo-stereo-amplifier-hybrid-ic-70w-70w","title":"STK4211II Sanyo AF Power Amplifier","description":"\u003ch3\u003eHigh-Output 70W+70W Stereo Audio Power Amplifier Module\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eSTK4211II\u003c\/strong\u003e is a heavy-duty thick-film hybrid integrated circuit from Sanyo's legendary \"Series II\" family. Delivering a continuous \u003cstrong\u003e70 Watts per channel\u003c\/strong\u003e, this module was a staple in high-end stereo receivers and integrated amplifiers. It is engineered for audiophile-grade performance with a balanced analog sound and a Total Harmonic Distortion (THD) of 0.4%.\u003c\/p\u003e\n\n\u003cp\u003eThe Series II architecture features an internal constant-current circuit to ensure high stability and a built-in muting circuit to suppress power-on\/off \"shock noise.\" This makes it the ideal choice for technicians performing precise restorations on premium vintage 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 70W + 70W (at 8Ω, 20Hz to 20kHz, THD = 0.4%).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 2-Channel Stereo in a standard 22-Pin SIP (Single In-line Package).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in Muting:\u003c\/strong\u003e Integrated on-chip muting to protect speakers from pop\/shock noise.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThermal Excellence:\u003c\/strong\u003e Built on Sanyo's Insulated Metal Substrate Technology (IMST) for superior heat dissipation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e Full-range high-fidelity from 20Hz to 50kHz.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e Recommended supply of ±42V (Absolute Maximum ±60V).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation \u0026amp; Technical Guide:\u003c\/h4\u003e\n\u003cp\u003eAs a 140W total output module, the STK4211II generates significant heat. It \u003cstrong\u003emust\u003c\/strong\u003e be securely mounted to a large, flat heatsink using high-quality thermal silicone grease. Operating this module without a heatsink—even for a brief functional test—will cause immediate and permanent internal substrate failure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eTechnician's Note: Before installation, verify that the power supply rails are symmetrical and discharge all filter capacitors. We recommend verifying the health of the output emitter resistors (typically 0.22Ω to 0.47Ω) and the speaker relay, as these are common failure points alongside the IC.\u003c\/em\u003e\u003c\/p\u003e","brand":"Sanyo","offers":[{"title":"New","offer_id":48013256851610,"sku":"SC0008","price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/9477\/8778\/files\/19-STK4211II_20Sanyo_20AF_20Power_20Amplifier.jpg?v=1778557059","url":"https:\/\/prellelectronics.com\/products\/stk4211ii-sanyo-stereo-amplifier-hybrid-ic-70w-70w","provider":"Prell Electronics","version":"1.0","type":"link"}