Could it be interference with the power cords? I just set up a Belles power amp and a Magus pre amp and have static that seems to be in the pre amp. I'm wondering if I might have bad cables because the units worked fine when I previewed them. With the Magus there is an external power source that needs to be 3 feet away from everything or it causes interference. I'm wondering if I have all the components isolated enough.
Might be another issue besides tubes anyway.
Might be another issue besides tubes anyway.