I braided them to make it neater and spread any physical load over more than one contact point to the PCB. As you can see the enclosure I used is quite small in terms of height so all that wiring you see under the tube socket is simply crammed in. I had expected there to be noise and to have to...

Yeah, it still gets pretty toasty - bearable to touch. It's a 100x~100 and cheap. http://uk.farnell.com/fischer-elektronik/sk-04-100-sa/heat-sink-100mm/dp/4621529

Here is my build with the Fred_fred2004 PCB into a Hammond 1590XX enclosure. Surprisingly it's quiet even with my octapus like wiring on the tube sockets.