With music amplifiers basically a couple TO-3's with nominal passive heatsink can output the equivalent 50 watts of a pair of 6L6 vacuum tubes.

The tubes run hotter because of the always-on heated cathode which is not needed for solid state amplification.

BTW still have a couple Diablos and a DEC drive, for parts, that could use a home.

Also an HP1000 in a full rolling rack the size of a refigerator, plus a VAX 4000, it's a mini-fridge. These are in good shape.