What MA per tube is best bias for KT88s in the 20th Shiva? I just tested the stock tubes and they were are like 21MA per tube which seems crazy low. Where do you guys recommend setting it? My Nitro I am running like 50MA per tube for KT88s and sounds amazing. The Shiva still sounds great I just thought it was way too low, but didn't want to pull it out of headbox if not needed.