04-03-13: Mofimadness
I've never seen or heard of a preamp with a built-in phono
stage, where ONLY the phono stage inverts phase? Usually
it's all or none, but maybe they do exist?
This is very common in older tube preamps, each 1/2 tube gain stage inverts phase and if you have an odd number of gain stages in a stage, it usually ends up inverted. It is not uncommon for either of the line or phono to invert phase.
Pays to check the manual.