So i got my new tubes and bias probe in today. The preamp tubes are SWEET! Now, i'd like to put in the power tubes. I've biased my single ended EL84 homebrew before and am familiar with all the concepts... But when it comes to the Fender Prosonic i'm a little lost on account of the three different rectifier/class settings. Can somebody walk me through biasing it so i've got it right in all 3 modes?