i wanted or may need to be more clear with the one issue with the amp, and maybe some clarification on what the mods do
the only issue is the master volume on the red channel so the red knob on the front, it doesn't work well or seemingly at all only between 9 and 12 o clock, i generally set that particular knob at 12 or slightly below seems to work well, and the mods which are overall concentric potted master volumes on the back which can be used as a boost with the second master,
hope this makes sense or clarifies anything at all
if not pm me, if interested or if further clarification is needed