I own a Doge 8 and installed Genalex Gold Lion 12AT7 tubes. I've been running the GL tubes in preamps for ~4 years and have always enjoyed their sound. They are very well balanced and fairly well extended on the high and low end. Bass is not overly bloated and comes across as quite full, though the high end may seem slightly rolled off. Note that when I say rolled off, it's not severe like JJ Tesla tubes. Considering the Doge 8 is so transparent, trimming a little off the high end works well.
Ditch the stock chinese tubes as soon as you can. would you buy a Porsche and put crappy tires on it?
Ditch the stock chinese tubes as soon as you can. would you buy a Porsche and put crappy tires on it?