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How much longer do tubes last when cooled?

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  • How much longer do tubes last when cooled?

    One might wonder if the vacuum tubes in audio equipment degrade as a function of ambient temperature; if so, is it wise to use cooling fans on them?

    Answer:

    Tube life decreases by 10% for every 5 degree of ambient temperature rise.*

    As a matter or practicality, this is only a relevant factor on power tubes with high power stress levels run near their envelope temperature limit. Further, fan noise does not go well with a good audio system.

    *AWA Review, Volume 32, 2019, page 168
    Last edited by Craig Maier; 07-07-2019, 05:05 PM.
    "Who put orange juice in my orange juice?" - - - William Claude Dukenfield
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