Zip cord was what we used to use in those days, but you might try a set of shortened "pin" connectors. I used those on an old Marantz receiver and they worked just fine. Happy listening.
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If you have any soldering skills you could mate a short piece of 12 gauge Romex into a bundle of better grade speaker wire such as Monster cable or the RCA brand sold at hardware stores.
This would allow for larger wire and still fit the existing connectors.
Price would be very low and yet provide better performance than 18 gauge lamp cord.