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I have a Realistic Model MPA-95 amplifier. I want to make a cable connection from it’s output to the input of my laptop to record speeches. Where can I find a cable (by manufacturer and cat. number) to accomplish this?

You just need a rca to Mini Jack 3.5mm cable. Ideally it should be an isolated cable, though a quick search did not find one. This is what you are looking for. https://www.bitebee.com/product-p/scoi6r