Prima Luna is good stuff and priced well. Auto bias is nice but biasing tubes is not that hard. On the question of tube life, except for infant death, if you have some hours on your power tubes and one fails it's probably better to replace the whole set. I've never had an issue that required the protective tube system to activate. I have blown tubes on other amps but I have not needed anything other than a new tube.
Primaluna?
I’m thinking about giving a full tube setup a go and Primaluna in particular. Looking to hear people’s experiences with Primaluna in general. My main draw to them outside of tubes is there auto bias and protective features. Wondering if people generally replace a single bad tube or if people are replacing all tubes of that type when there’s a failure. Also would be interested if there were any other companies with at least a similar protective feature. The auto bias sounds great but the protective features are a bigger deal to me.