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The 4711 Mixer is a four channel mixer with pan controls for left and right outputs. This kit was $29.88 in the 1976 catalog.
These are the bottom traces. The two resistors are bleed resistors for the output capacitors. The top bus wires connect to the 3.5mm jacks.
I ran ground wires to all the 3.5mm jacks. The power cable terminates in a 4 pin MTA connector. The ICs had already been upgrade to TL072.