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    cooler running power transformer with change in driver tubes ?

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    tajanes

    Posts : 12
    Join date : 2015-02-07
    Location : Chicago

    cooler running power transformer with change in driver tubes ?

    Post by tajanes on Sun Jun 07, 2015 3:53 pm

    I early on had switched out my tube rectifier for a Weber WZ34, but most recently put in RCA 12AU7A’s (the two outside tubes on the driver board) replacing Northern Electric 12AU7’s I had for each of the 3 driver board tubes, and it seems that my power transformer (ST-120 amp) is running cooler (probably fairer to say not running quite as HOT). While I expected to mod the sound a bit, question: but these are the same family of tubes (12AU7A) I didn’t expect impact on power transformer- is there something to this ?

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    Maintarget

    Posts : 209
    Join date : 2013-02-10

    Re: cooler running power transformer with change in driver tubes ?

    Post by Maintarget on Sun Jun 07, 2015 4:00 pm

    You should check your bias after changing the rectifier tube.

    tajanes

    Posts : 12
    Join date : 2015-02-07
    Location : Chicago

    Re: cooler running power transformer with change in driver tubes ?

    Post by tajanes on Sun Jun 07, 2015 4:06 pm

    sorry to confuse with the rectifier change - yes I did re bias after the change (this was mentioned as a fyi as I have read this also helps the power transformer run a bit cooler as drawing less power)


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