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    A really lame question, but . . .

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    deepee99

    Posts : 1260
    Join date : 2012-05-23
    Location : Wallace, Idaho

    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?

    Big Harry

    Posts : 1
    Join date : 2016-06-19

    Re: A really lame question, but . . .

    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
    Admin

    Posts : 2374
    Join date : 2008-11-26
    Location : Massachusetts

    Re: A really lame question, but . . .

    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

    Posts : 1260
    Join date : 2012-05-23
    Location : Wallace, Idaho

    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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