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In Reply to: RE: Do tubes get "tired"? posted by airtime on April 14, 2015 at 06:28:00
"like some resistors and caps do they [tubes] loose their physical function?"
Sure, that's one of the reasons we don't use them anymore. They get gassy, their cathode emission craps out, the grids start rattling and become microphonic and eventually the heater burns out. Or they short from a sliver of one of the elements touching another and their pin-socket contacts are always problems from the thermal excursions. By and large tubes suck compared with solid state for reliability and consistency.
But sometimes they seem to last forever and it's apparently a combination of happening to be produced well along with an application they like. They achieve the most service-hours in low stress applications where they are on constantly.
Solid state and passives are generally orders of magnitude more reliable.
Rick
Follow Ups:
And many orders of magnitude less enjoyable to listen to .....
In my life with tubes so far no tube got tired but a coupled have died suddenly and scarily. I am not fond of tube arc light shows!
Steve
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