[Arran]

Antique Electronic Supply, if you can not find a closer source, they do not manufacture transformers, but they do have a large selection of them. I have never bought a new power transformer, so far I have been lucky enough to find enough scrap equipment to supply a used one. I think AES has a generic power transformer that will work with a 6 tube set, with 5 6.3 volt tubes, plus a 5 volt rectifier tube, the best selection is under replacement transformers for guitar amplifiers. There is a good chance that your Pilot radio was actually British made, unless you have a label that says otherwise.
Regards
Arran