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I am new here but have lurked for quite awhile. I decided to mod my TP30 for balanced headphones and when I removed the 3.5mm jack the speakers no longer output any sound. I do have a toner and I still get a signal at the volume pot. Do I have to solder two of the points together where the headphone jack was? I do not remember if plugging in headphones disables the amp or not but I'm going to assume it does. Any help would be greatly appreciated. Thank you!