Hello, I'm looking for valves to put in my ac30cc2, that'll give me more breakup? If anyone has suggestions, that'd be great.
Those will give you earlier breakup in the power section, but that still means the amp will have to be pretty loud before you get much more distortion than you're already hearing from the preamp. It will make a difference but you may be surprised at how little. Trying "high gain" preamp tubes is probably going to be a lesson in disappointment.

I find that most people who want "tubes for more distortion" actually need a distortion pedal. If you want anything more than just a tad more breakup, tubes aren't the answer. Most amps aren't going to gain much distortion from a tube swap.