Found a Power amp "STK4133ii"

I saw this but It's in German (I suppose).

Besides from the different language It doesn't even have the information I need.
At how many volts this amp functions? How many watts output does it have?
From the small research I did, I understood that this datasheet only describes how to replace a power amp from old sony devices.
Correct me if I am wrong.
 

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And Donberg say it is a voltage regulator... there were some STK voltage regs that used to be used in VCR's many years ago but I can't recall the number.
 

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I saw this but It's in German (I suppose).

Besides from the different language It doesn't even have the information I need.
At how many volts this amp functions? How many watts output does it have?
From the small research I did, I understood that this datasheet only describes how to replace a power amp from old sony devices.
Correct me if I am wrong.
This item is totally obsolete and the only information would be to trawl the interweb for a Sony product that uses one and get the values from there.