Can you do anything to make power tubes last longer ?

Some claim that solid state requires less maintenance because you never have to replace tubes, but changing a tube is so simple that finding a bad transistor is far more complicated.

This is true. Across probably hundreds of components I've used in my time in this hobby, once you eliminate simple "replace the bad tube" issues, I've had decisively more failures with Solid-State - and they're far more frustrating and difficult. Especially when the transistors you need are long OOP and counterfeited like crazy.

Bill, there was a lot of electrical work done in your house and still the current is not good enough, especially, as I understand, in summer.

Batteries can limit the dynamics, I guess, but maybe some companies overcame this, I have no idea.

I use old PS Audio regenerator in my system, everything is plugged in it. By comparison, without it the system is unlistenable, and this is not exaggeration. The dynamics too is much better.

I think, wall current is the biggest problem in audiophile world. And increasingly so.

Good tube equipment will last for decades with only occasional tube replacements. The only problem, two problems in fact, NOS tubes will be getting more expensive and more difficult to find. But some transistor equipment is also very reliable, think Gryphon and Accuphase, as an example. If not tubes - that's what I would have.

It is VAC Avatar SE integrated.