In my opinion this would depend on what is behind it. You'll notice dramatic changes in sound be modding your source (if necessary) as well as any pre-amplification you may be using. But modding the power amplifier should be the last on the list unless it has some well-known draw-back that should be addressed.
Is It Worh Modding An Amp
I have a Primaluna Dialogue One that sits idle as a backup. I’m debating the idea of having it modded. Problem is I have no idea what can or should be upgraded or if the amp is worth the investment. Id be willing to fork over 500-1000 if it was worth it and made sense compared to what else I could do with the funds. Curious what people’s experiences and thoughts are?