Tex,
Most such vintage equipment sold here came with instructions to the buyer for fitting a plug. They usually stated that if a 13A (BS1363) plug were used that a 2A or 3A fuse be fitted, or that if any other type of plug is used that protection at the panel must be no more than 5A.
The latter case would usually mean use of a BS546 (round-pin) 5A plug. It's an interesting contradiction though, because IEE Regs. permitted 5A BS546 receptacles to be wired on circuits rated at up to 15A.
