{"product_id":"stk4040ii-sanyo-mono-power-amplifier-hybrid-ic-70w","title":"STK4040II Sanyo AF Power Amplifier","description":"\u003ch3\u003eHigh-Output 70W Mono Audio Power Amplifier Module\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eSTK4040II\u003c\/strong\u003e is a versatile thick-film hybrid integrated circuit from Sanyo's trusted \"Series II\" line. Delivering a continuous \u003cstrong\u003e70 Watts\u003c\/strong\u003e of power, this module is an essential replacement part for high-performance vintage receivers, dedicated center channels, and active speaker systems.\u003c\/p\u003e\n\n\u003cp\u003eThe STK4040II is engineered for split-power supply systems and features an internal constant-current circuit designed to reduce supply switch-on and switch-off shock noise (\"thump\"), ensuring your speakers are protected during operation. It offers a balanced performance profile, combining high-output power with excellent thermal durability.\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 Minimum (at 8Ω, 20Hz to 20kHz, THD = 0.4%).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Mono (Single Channel) in a compact SIP-ZIP package.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThermal Reliability:\u003c\/strong\u003e Series II architecture optimized for low thermal resistance (1.5°C\/W).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e Full-range audio capability from 20Hz to 50kHz.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e Recommended ±42V (Absolute Maximum ±60V).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePin Compatibility:\u003c\/strong\u003e Member of the STK4024II series (20W to 100W) for flexible repair options.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation \u0026amp; Technical Notes:\u003c\/h4\u003e\n\u003cp\u003eThe STK4040II generates significant heat during operation and \u003cstrong\u003emust\u003c\/strong\u003e be securely mounted to a 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 Tip: Before installation, verify that the power supply filter capacitors are fully discharged. Since this module is often used in receivers that have aged, we recommend checking the output emitter resistors and the speaker protection relay to ensure a stable environment for the new IC.\u003c\/em\u003e\u003c\/p\u003e","brand":"Sanyo","offers":[{"title":"New","offer_id":48006075449498,"sku":"SC0007","price":26.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/9477\/8778\/files\/38-STK4040II_20Sanyo_20AF_20Power_20Amplifier.jpg?v=1778389482","url":"https:\/\/prellelectronics.com\/products\/stk4040ii-sanyo-mono-power-amplifier-hybrid-ic-70w","provider":"Prell Electronics","version":"1.0","type":"link"}