Yes, it’s the 75 gal. model. Thanks for the input.
The pilot flame looks normal. No lifting, no yellow. It contacts the thermocouple just fine. The pilot lights once and then the burner fires. When the burner goes out (within 10 minutes), the pilot light goes out too. Then I cannot re-light the pilot until it is cool again.
There’s a good draft up the flue. There’s no spillage from the draft hood when it fires.
It has a new thermo-coupler.
I could not light the pilot at all this morning. I am going to weigh a new control valve (as rare as it is that they fail) vs a new water heater.