FM on SW

[Gregb]

Looking for suggestions, I am working on a no-name 50's vintage 6 tube radio record player. I have not been able to track down a schematic and it has been recapped sometime in the past. I have recapped it and replaced a couple resistors. The AM works great with plenty of sensitivity and it sounds good. The shortwave works good as well but I am getting lots of FM interference, some stations are coming through almost good enough to listen to. Seems to be the same four or five stations fairly close together and tuned at four or five spots across the dial. I have never seen this before in 30 years of working on these old radios.
Anyone have any ideas?
Thanks

Gregb