Unused MC cartridge preamp PCBs 1970s never used. Two PCBs and one lower chassis. There are no input or output connections or power supply socket installed. Connections clearly marked on PCBs.

Requires 12VDC power supply at very small 15mA current to operate. (There is a 9 volt regulator on the PCB.) These have preset switches for input load/ capacitance matching to your moving coil cartridge. I can provide a copy of the manual with schematics.

Pulled the image from net. These are stereo boards, only need one PCB per cartridge. Untested but I suspect that they would operate perfectly if wired up.

Make an offer I may adjust the price.