Any issues with bundling power cables together?

My biggest issues with respect to noise and cabling have been speaker wire close to ethernet wire or switch and speaker cable near power cords.   As long as I keep those away from each other my system is dead silent. 

I had a weird crackle noise intermittently,  mostly through the right channel.   After testing all tubes and trying others took the ethernet out of the equation and my noise went away.    I moved the switch and cabling away from my speaker cables and problem disappeared 

I channel my power cords down one side of my rack using Velcro straps. Other side of rack I run my audio cables and tie them with Velcro straps. Keeping power separate keeps everything quiet. Also like was mentioned keeping Ethernet and cable apart is helpful in eliminating noise.

There will be increased inductance if the power cables are bundled together. That's generally not a good thing.

I agree with isolating ethernet cables from all others, separating speaker cables from power cables and lastly interconnect cables from power cables as much as possible.