[Arran]

 Like all brand Z AC operated models from the late 1930s and early 1940s it would be best to test out the power transformer first before buying, so bring your Ohmmeter and Ohm out the transformer windings at the rectifier tube socket. Brand Z had a nasty habit of using the same size power transformer in a 12 tube set that Philco would have used in a 7 or 8 tuber, it does not mean that they will all burn up but it does mean that there isn't much room for failure either if the set was powered up and run with leaky caps in it not to mention a dead short.
Regards
Arran