stk411210e datasheet
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The IC uses a standard 18-pin SIP. Hold the IC with the printed label facing you and the heatsink tab to the rear.

Before diving into the numbers, here are the standout features summarized from the official datasheet:

STK modules are legacy-style hybrid amplifiers; modern alternatives include monolithic power op-amps and Class-D amplifier ICs with higher efficiency and smaller heatsinks. Selection depends on:

: Includes internal circuitry to minimize "pop" noise during power-on/off sequences. Constant Current Drive

If you measure high DC voltage at the speaker terminals, the internal output transistors are likely shorted.