That's NOT a dumb question. The Vali's tube is warm to the touch. I wouldn't pull it out with my bare hands (while its running)... in my case, I'd be concerned about dropping the tube. They're built like a thick-walled incandescent light bulb. If you use the same precautions as attempting to unscrew a 'lit' bulb, you (and your child) will be safe. And the glowing tube isn't blazing like a flare. It's an orange glow. The biggest concern I'd have is one leaving tubes rolling around on the floor and your child sticks it into her mouth!
My Vali's stock tube's firmly anchored in place.Your child will have to be given quite a bit of unsupervised time (and dexterous, upper-body-strength) with this amp to wiggle it free.
@bcowen 's right on the money. I suspect Schiit Audio
chose this particular tube (valve?) for its physical & operating characteristics.
and price and availability
Welcome to the thread,
@Rwit