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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

250 degrees C!

I own a Fluke 87V meter that has a temperature probe option. I have measured the temperature on the surface of the glass envelope of a huge type 7241 output tube pulling about 0.5 amps of current at steady state in my OTL amplifiers. The glass reaches a little more than 100 degrees C max, which is plenty hot enough to overheat my living room after several hours with a total of 8 tubes running in twin monoblocks. Thus I wonder whether anyone should worry about what happens at 250 degrees C on a tube pin; the pin is very unlikely ever to get as hot as does the glass envelope of any tube.

250 degrees C = 482 degrees F. You could broil a steak at that temp.



Edits: 06/28/16

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