I recently replaced the capacitors in a newly acquired USA pro junior from 97. I replaced the speaker because the original must've had a broken voice coil - no resistance. While waiting on the speaker I decided to replace the filter caps - nothing seemed too wrong with them but being over 20 years old and the original Illinois caps, I figured what's an hour? I don't remember what it was like before I changed the caps but now there is an excessive hum when not touching the strings - compared with a different amp (Mesa Rocket 44 on dirty channel) in the same location of my home, same guitar. Is this more than likely just a characteristic of the amp that I didn't notice before where the interference picked up by the guitar is more prominent? I've recapped one for a buddy before because it had a leaky B+ filter cap. I don't remember his being this loud. Again it's only RF interference when not touching the strings - but I feel like it's excessive. I could also be being hyper sensitive to it. Thoughts and advice aside from the regular "burn it" and "get a real amp" that are sure to come?