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    A really lame question, but . . .

    deepee99
    deepee99

    Posts : 2206
    Join date : 2012-05-23
    Location : Wallace, Idaho

    A really lame question, but . . . Empty A really lame question, but . . .

    Post by deepee99 on Sun Sep 18, 2016 12:07 pm

    Bob L, et. al
    Why do we run AC to the filaments?
    DC light bulbs like we used on boats last forever. AC bulbs in the house last maybe for a year or two.
    Maybe there's a reason but I'd like to know it.Is it just the way the xformers are spun? Or does an extra rectifier complicate things?
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    Big Harry

    Posts : 21
    Join date : 2016-06-19

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    Post by Big Harry on Sun Sep 18, 2016 5:13 pm

    I believe the extra cost to rectify the power to the tube heaters isn't justified in most cases with the exception of low level pre amp tubes such as phono pre amps.
    Bob Latino
    Bob Latino
    Admin

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    Location : Massachusetts

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    Post by Bob Latino on Sun Sep 18, 2016 5:26 pm

    Big Harry wrote:I believe the extra cost to rectify the power to the tube heaters isn't justified in most cases with the exception of low level pre amp tubes such as phono pre amps.

    Big Harry hit it right on the nose ..

    Bob
    deepee99
    deepee99

    Posts : 2206
    Join date : 2012-05-23
    Location : Wallace, Idaho

    A really lame question, but . . . Empty Re: A really lame question, but . . .

    Post by deepee99 on Mon Sep 19, 2016 1:10 pm

    Thanks, guys.
    Was just curious. It's not usually that the heater craps out first, anyway.

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