I used a slightly different IEC power assembly.
Notice I kept the AC wires as short as possible and away from the circuity.
This is too help keep any AC being induced into amp circuitry.
You might want to shorten your wires up a tad.
Since then I have added a to position gain switch and a blue power LED on the front panel.
I also went back ad shortened the black wires doe the input to the board and vol pot.
Once the amp is working on the bench you can package it up and only need to get inside to change op amps if u desire.
The two electrolytic caps on both sides of the op amp IC socket are right next to the socket, making the removal and insertion of op amps a bit of a chore…
The front panel has 4 screws that u have to take off, remove the volume pot knob and carefully pull forward the front cover to get to the op amp.
One good suggestion is to mount those 2 electrolytic caps at right angles to the socket when soldering in, just bend the legs 90 degress.
Did u get your power supply to work? I noticed your comments at diyaudio.com?
Good luck and take is slow and easy and make sure your parts are in the correct area and installed in the right direction, especially those electrolytics!! If u put them in backwards they will fail rather quickly and cause a mess.
Alex