I have an old Wavetek signal generator. I loaned it to someone and they lost the lead so I am trying to find out what the name of the plug is on the equipment end. This device is from the early 70s and had a removable mains cable, the equipment end connector is a 3-pin, the shape is oval (about 1.25 inches wide and 0.5 inches high) with three pins in a row(ish) with the centre pin slightly above the outer pins. I think the centre pin is earth. The pins are all circular. Can anyone tell me what this lead is called so I can try to track one down?