[Arran]

The caps...CapXon....never heard of these.
Seriously. You need to get someone with experience to look at it.

Mike;
  Consider yourself fortunate that you haven't. Capxon is one of those Chicom mystery brands of caps that are on the hall of shame list over at badcaps.net. They are so bad, and have caused so many premature equipment failures, that people call them Craps-on as well as other more expletive names. In this case it is on the cathode of the 6F6G tube so even if it was dead shorted it wouldn't kill anything, but it surprises me that Just Radios would pedal such an infamous brand of capacitor.
Regards
Arran