ventilation necessary for tube mic power supply?

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Normally these little tube mic supplies don't chuck out much heat.

I'd say build it, and if things get too hot then heat sink them to sides of the box.
 
That's kind-of what I wanted to say, but I can't speak for PSUs that I've never used before.

If it contains non-heatsinkable components that are producing lots of heat, then I'd vent it. One of my PSUs which uses a valve regulator is well vented as it gets warm.
 
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