Ok so I have this vt71 already restored works great but back when I finished it there was a bad hum which sounds like a 60 hz hum. Since then the only thing I did was tried different tubes thinking maybe an HK short but no difference is there any place else I could look for this problem, except caps because thinking at the time maybe I had a bad cap and tried paralleling them and had no change. The more i raise the volume the less you can here the hum but minimum volume the hum is loud.
