The Dynaco Tube Audio Forum

Would you like to react to this message? Create an account in a few clicks or log in to continue.
The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


4 posters

    12at7 vs 12ay7

    rfbro
    rfbro


    Posts : 27
    Join date : 2014-12-28
    Age : 68
    Location : Vancouver WA

    12at7 vs 12ay7 Empty 12at7 vs 12ay7

    Post by rfbro 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
    peterh


    Posts : 1823
    Join date : 2012-12-25
    Location : gothenburg, sweden

    12at7 vs 12ay7 Empty Re: 12at7 vs 12ay7

    Post by peterh 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)
    Roy Mottram
    Roy Mottram
    Admin


    Posts : 1840
    Join date : 2008-11-30

    12at7 vs 12ay7 Empty Re: 12at7 vs 12ay7

    Post by Roy Mottram 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
    avatar
    Jim McShane


    Posts : 237
    Join date : 2011-10-19
    Location : South Suburban Chicago

    12at7 vs 12ay7 Empty Re: 12at7 vs 12ay7

    Post by Jim McShane 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.

    Sponsored content


    12at7 vs 12ay7 Empty Re: 12at7 vs 12ay7

    Post by Sponsored content


      Current date/time is Thu Mar 28, 2024 2:05 pm