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    A few 12AU7s Do I have anything "special" here?

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    jhoak

    Posts : 46
    Join date : 2009-10-16
    Age : 58
    Location : Central Florida

    A few 12AU7s Do I have anything "special" here?

    Post by jhoak on Wed Sep 07, 2011 7:46 am

    Please enlighten me.

    Yesterday I picked up a Cary 303/300 CD player. The seller handed me a small bag of "surplus" tubes for it. The stock tubes are Electro Harmonix. In the bag was:

    A pair of RCA 12AU7
    A Pair of Philips ECC82
    a Pair of Groove Tubes 12AU7

    Are any of these what one would call standout? My amp uses 3 12AU7s in the driver stage so I might have an opportunity to do a bit of rolling

    Here's the photos of them. Only one of each is shown and the EH are currently installed in the player.




    Bob Latino
    Admin

    Posts : 2378
    Join date : 2008-11-26
    Location : Massachusetts

    Re: A few 12AU7s Do I have anything "special" here?

    Post by Bob Latino on Wed Sep 07, 2011 12:44 pm

    Hi Jeff,

    The best thing to do is to let your own ears be your guide. There is no one "best" tube for an application. Personally, I like the Mullard CV4003 for most 12AU7 applications. That is not to say that the Mullard may be the best in ALL 12AU7 applications. For the phase splitter section of the LOWER gain version of the VTA driver board and the phase splitter of the M-125's, I like 12BH7 tubes. For your Cary you should also try 12BH7 tubes in place of 12AU7 tubes. They are not exactly the same as a 12AU7 (they have slightly lower gain) but the *should* work OK in almost any 12AU7 application.

    Bob

    Tom

    Posts : 166
    Join date : 2011-04-04

    Re: A few 12AU7s Do I have anything "special" here?

    Post by Tom on Fri Sep 30, 2011 1:35 pm

    I have those RCA cleartops in my SP-8 preamp for the line stage.
    They're pretty well thought of and IMHO sound amazing.

    Smile Tom

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