Do IV-9 tubes get very hot?

[newxito]

Has anyone measured how hot an IV-9 can get?  Right now, I don’t have access to a tube to test myself.

I'm wondering if I need to foresee some kind of active cooling for my project. I’m designing a calculator with 16 x IV-9 tubes in a closed case with some ventilation slots. If I calculated this correctly, they would dissipate about 11.5 watts if all segments were on and that’s a lot… 

[Oskar]

I have no experience with IV-9s specifically, but I do have a DR2010 Numitron clock, and the tubes don't even get slightly warm. They feel close to ambient temperature even after hours of operation. Granted, I am slightly underdriving them but I doubt running them at their rated current would make a significant difference. Based on that, I am fairly confident that active cooling isn't necessary for your use case.

[Nicholas Stock]

Agreed. I've had a DR2000 clock running for years, never noticed any significant heat from the tubes at all....

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