Hi all, Sorry this is a little bit long but please bear with me. A few months ago I wanted to see if I could build a small, relatively light single channel/no tremolo version of a Fender Twin AB763, with all its power. I used my own layout (just deleted the stuff I didn't want) and built it on a Princeton chassis with a very light single 12" neodymium 200W speaker). I was able to squeeze everything in and it all works but it is noisy; I wasn't happy with it and so I've decided to try again and could use help. Because of the small chassis I didn't have room on top to put the filter caps in a doghouse, and I had to put the output transformer all the way to the right and snake the wires a good distance on top of the chassis to make room for a speaker. The four 6L6s barely fit next to the power transformer .. overall, it was noisy and I couldn't get the hissy, white noisy floor to go away, despite trying a bunch of different electrolytic layouts. Plus, with all the transformers on the chassis, it was seriously top heavy. So I'm going to try again and could use some advice. This time I'm planning to use Rob Robinette's single channel/no tremolo AB763 "Blackvibe" layout found here: https://robrobinette.com/RR763_BLACKVIBE.htm#AB763_Single_Channel_With_Reverb_But_Tremolo_Deleted My idea now is to put the power transformer on a small chassis at lower right of the cabinet. The power switch will be on that chassis but everything else (faraday shield, HV secondary and center tap, and heater wires) are going to go to an umbilical on a six-pin octal socket. I'm planning to snake that from the right side of the lower chassis to the top left of the upper chassis, where I'm hoping to put the choke and output transformer. I'm going to use a doghouse on top of the chassis this time and I'm going to layout the four 6L6s in a square pattern, as opposed to the four in a line pattern, to keep everything together. There are six wires in the 18g unshielded umbilical I have: 1. One connects ground of power supply to ground on top chassis. 2. Two heater wires 3. HV-0-HV I want to put the two big transformers on opposite sides of the chassis for balance; speaker would go roughly in the middle. I have a few questions though: 1. Will snaking that AC from one side to another cause issues? I can't find shielded six conductor cable in a heavy enough gauge to supply the heaters. I was going to run the umbilical straight up from power transformer at right and tuck it right underneath the faceplate, then head to the other side from there, to keep it as far away from the reverb tank as possible. 2. The reverb tank will have to be a short 9" spring to fit next to the power transformer on the bottom. Should I move the reverb jacks to keep them away from the power transformer? And if so, should I run shielded wire to the jacks inside the chassis, since they won't be in their standard position at back right? Thanks for hanging in there on this long post. So many questions and unknowns. I'm committed to building a quiet amp and could use any advice on keeping it quiet as I can get. Thanks!