RIAA preamp Audio Mixer graphic equaliser unfinished project slide pots

Built on Vero Board. PCB1 LF353N x 5 Datasheet 4 RIAA equalised pre-amps for moving coil pickup, 4 tone controls

PCB2 11 slide pots LF353N x 3, mixer and stereo graphic equaliser, 5834N low noise mic preamp, sgs 2501at I think dual power supply regulator.

I have not found circuits but fairly easy to trace. Sold as seen but no reason to believe not able to work.
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