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    12at7 vs 12ay7

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    rfbro

    Posts : 26
    Join date : 2014-12-28
    Age : 61
    Location : Vancouver WA

    12at7 vs 12ay7

    Post by rfbro on Wed Mar 11, 2015 8:21 pm

    I have an sp 9 with a ph 10 phono stage witch uses 12ay7... my question is can i use some of my vintage NON 12at7 bent wing blackplates in place of the stock tube....i believe the 12at7 is 60 mu and the 12ay7 is 45...BOB B

    peterh

    Posts : 679
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Re: 12at7 vs 12ay7

    Post by peterh on Thu Mar 12, 2015 8:37 am

    rfbro wrote:I have an sp 9 with a ph 10 phono stage witch uses 12ay7... my question is can i use some of my vintage NON 12at7 bent wing blackplates in place of the stock tube....i believe the 12at7 is 60 mu and the 12ay7 is 45...BOB B
    Nope, this is dissimular tubes.

    12ay7 is more like a 12ax7 / 5751 type of tube.

    ( i know that guitarfolks happily mix these tubes, but they are searching for distorsion)

    tubes4hifi
    Admin

    Posts : 1291
    Join date : 2008-11-30

    Re: 12at7 vs 12ay7

    Post by tubes4hifi on Thu Mar 12, 2015 9:46 am

    the PH10 phono stage is optimized for the 12AY7 tubes, any other type will throw of the RIAA EQ completely

    Jim McShane

    Posts : 154
    Join date : 2011-10-19
    Location : South Suburban Chicago

    Re: 12at7 vs 12ay7

    Post by Jim McShane on Fri Mar 13, 2015 3:03 pm

    What Roy said! And also it's more than just the tube's mu that is important. Transconductance and plate resistance also factor in, and in a phono stage these values are all important.

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