Use Radio Shack gold crimp spades(no solder) they will fit your vintage barrier strip screw connectors.Depending on how large a cable you will be using you can connect two cables together at the amp end's for biwiring your speaker's.
Speaker cable connections for vintage gear
I have a couple of nice, stock, vintage amps (McIntosh MC-60's, Dynaco ST-70 and Dynaco SCA-35. I always get frustrated trying to get decent speaker cable connections when I insert these into my system. In each case the speaker connection on the amp is a small, screw barrier type. Is there some realatively inexpensive/easy way to deal with this situation. I recently upgraded my speakers to North Creek Music Borealis speakers. I want to bi-wire, but will probably use jumpers when using the vintage amps. Are there small spades available to use with vintage gear, other suggestions? I am not really wanting to change the amps to accept larger spades or bananas, and I am willing to compromise on the size and quality of the speaker cable to get to a clean solution. Thanks for your input.