Does anybody know where I might obtain a pair of the non reversible
speaker plugs which used to be used in sixties hifi?

I have an Armstrong 222 that I've pressed into service after the
Cambridge lost a channel. At the moment the speaker wire is poked into
the sockets in the back of the o/p transformers but this is not the
standard of installation we aim for.

Any help will be much appreciated.

Best Regards,

Doug