NAD 1300 Headphone Jack Hum Solved
Just thought i'd share the solution of my NAD 1300 pre amp headphone hum problem. I had hum in the headphones without any source connected. Turned out to be bad caps in the power supply. C605, C606 leaked black stuff and C613 and C614 were open. Replaced all 4 of them and all is well. I think i'm going to replace all the electrolytic in the power supply to be on the save side.