MLA21 is an audio amplifier product of PIONEER circa 2000s and they make title for this amp with “Efficiency Amplifier”.
INFO
The amplifier using STK IC number 411-230 with 120 Watts output at 4 Ohm supply 43VDC simmetrically and 25VDC simmetrically.
SCHEMATIC DIAGRAM
The result of edited and cropped schematic diagram looks like this:
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INFO
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