These Audio output IC's are not easily available unless you try for some old stock in good electronic stores. mention the details of the STK number and if you are not able to get this same , it is better to substitute with a universal type output - Mosfet type or IC matching the power supply.
Just order the stk????? part number printed on the IC from a supplier. Try typing it into Google, there will be loads of suppliers offering the sale.
Hope that helps.
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