How many watts does my cab need to be for my tube guitar amp?

We get questions like this all the time. So, we're working on short videos like this with simple answers to get people started on their gear journey. Naturally, as with all subject matter, you can go down quite the rabbit hole of debate. But, this advice will suffice for the greatest number of people asking themselves this type of question.
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[@antoineleedolliole7549]

I'd like to request that you demonstrate a half stack in the process of being plugged in and warmed up.
Most videos skip the actual set up part because I let my mode four chill for years for fear of blowing something.
I had to learn that the master volume, consequently, controlled wattage being sent to speaker output and reduces risk of damage if you don't crank it.
Now my acrusl question is how can I attenuate wattage from an over powered tube head going to a cab?
I want the amp running closer to its 350 watt nominal, with excess wattage getting split off to elsewhere, away from my 100 watt cab, what should I be looking for besides an oversized cab?

[@NextGenGuitars]

Sounds like you're looking for a Variac or power attenuator. There are a lot of options for reducing the output of your amp while still having the front end pushed.

[@tonepilot]

Nice one