As an amplifier designer I can't wait to begin a new prototype.
All who are upgrading make sure that you don't exceed your power transformer max current on the 6.3 volt buss. These tubes require 3+amps each. The prospect of a build that will run 800 volts on the plates is awesome. I will have to build matching transformers that can handle the 300 ma of current going to the b+supply. My current design is a little undersized for the 150s but in testing and a limited production has been reliable. This will be a game changer. I believe still that the best sounding amp I have designed has a pair of soveteck 6l6wxt+........ but we will soon see.