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Does heat kill tubes?

My system went into a steel container for the past three months while my house was going through remodeling. Container sat on my drive way which receive lots of sun, interior temperature often reached 120+ on hot days. My SF Line 3SE was working flawlessly before packing into the box, it now has a noisy channel which was caused by a bad tube in the buffer section.

Tubes are not as rugged as transistor, but they should be able to withstand 120 degree easily without operation. I assumed if it could survive years of life on the shelf, it should survive a few months in a container. Or am I wrong?
semi
aida_w
308 posts
 
I think you are right. I'd consider transportation into and from the container, new setting up and all that moving around being the cause of that failure. A tube guru once told me: "tubes last much much longer than you would expect - as long as you are nice to them." Being stuck in a hot container can't be nice? :-)
Good luck!
herman
2,215 posts
 
As far as heat is concerned, tubes can take a lot more than transistors. Since the tubes get that hot or hotter in normal operation, I don't see how heating them up would damage them.

I think the tube failure after storage in the heat was coincidence.
marakanetz's avatar
marakanetz
5,473 posts
 
120+ is literally nothing to tubes even 180.
did you or anyone else accidentally hit the box with your car or truck?:-)
eldartford
4,262 posts
 
Not operating can be hard on tubes because gas (that leaks through the glass) can accumulate. High temperature may speed up the gas accumulation. Operation of the tube cleans out gas.

However 3 months is not that long, and 120 degrees is not that hot, so I would bet that your tube failure was just a coincidence.
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