STK4141II

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I have a old Pioneer amplifier with STK4141II.
After STK replacement the quality of sound is weaker. I think is a fake!
Please help me to buy an original STK4141II or to find a good one for improve quality of amplifier!
I think Sanyo has stopped the production of 4141 and I'm ok with a second hand IC if the suppliers don't have old stocks.
 
This power amp is a quasi complementary design , wich is not surprising ,
but what is odd is that Sanyo didnt put emitter resistor to the power devices
as thermal tracking of the VBE multiplier can be quite efficient given the compact
implementation , but if ever the module start to heat and the heatspreader is
not big enough thermal runaway could appear and become unstoppable...
 
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