So I have a Archon 100 and a Archon 25. Both are amazing and unique. Although, I would love for my PLUM ARCHON 25 Watt combo to be tamed a little bit more. I have not changed out the 12ax7's yet but if i did. Which model of 12A?7's should I try?? They say 12at7's have the least gain. Is this true??