Reactive load + convolution cab sim (eg Two Notes Wall of Sound) + some good impulse response files (Ownhammer seem to work best for me).
All of the flavour of your tube amp from input stage to output transformer. Play silently through headphones or hi-fi loud through your monitoring gear.
If you don't want a computer & audio interface in the chain I think Two Notes do some boxes with reactive load + built-in cab sim.
DO NOT use an ordinary resistive load. The tone is still there but you lose all the dynamics and "feel". Reactive loads are very easy to make if you can handle a soldering iron.
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