12AX7 replaces 12AU7??

BitoFrantido
BitoFrantido Posts: 2
edited July 2009 in Electronics
Anyone pulled on their 12AU7's and put in 12AX7's? :confused:
Post edited by BitoFrantido on
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  • BitoFrantido
    BitoFrantido Posts: 2
    edited July 2009
    Would 'mo gain (x7's) make a volume difference in a preamp?
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  • F1nut
    F1nut Posts: 51,028
    edited July 2009
    A 12AX7 has a gain factor of 100, while a 12AU7's gain factor is 20...not even close. Besides that little issue, the anode current and grid voltage are very different. Therefore, 99% of the time they are not interchangeable and will cause bad juju to happen to your gear.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • george daniel
    george daniel Posts: 12,096
    edited July 2009
    ^^^^^^^^^^^^^better listen to was he's putin' down^^^^^^^^^^^^

    In some cases you can interchange them,, in most,,,nope,,check with your manufacturer before you proceed.
    JC approves....he told me so. (F-1 nut)
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