Sony MHC-RG490S/RG590S – power amplifier and power board schematic
Using ICs: STK412-240, STK403-130, STK 404-130
Schematics [Power amplifier] STK-403 130
STK 412-240 Power amplifier schematic
STK 404-130 Sub-Woofer schematic
Mains transformer board schematic
