Hello, so I'm working on 5F6A clone. The filter caps used to be located inside the chassis right above the power tubes. I wanted to install new F&T caps, but they are too big to go inside the chassis so I mounted them outside, behind the chassis where Fender used to do it. Now there's a hum. Sounds like 60 cycles and it increases with volume on either channel and is also affected by the tone controls (treble, mid, presence, bass). I feel like it's because of the proximity of the B+ wires to the tone pots/ wires. But that's how Fender did it, correct? Am I missing something here? Is there a better way to run these wires?