LA2786
The LA2786 was a Dolby Pro Logic decoder IC manufactured by the Sanyo Corporation. It provided decoding for the surround channels, including volume and balance controls. In the pin-out and internal block diagram, you can see the level of complexity this involved.
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Kenwood KR-V5090Inside View
Power Amplifier IC Modules
STK499-070
Main Board and Chipset
Phono Preamplifier Circuit
Front Panel Board
Standby Power Board
Tuner Board
NJU7313AL
LA2786
M62430FP
SAA6579
Power Supply
Back Sockets