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Thread: Tube question

  1. #1

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    Question Tube question

    Can 12AU7s be used in place of 12AX7s? What about 12AT7s?? They would be going into a Dodd MLP.

    Thanks

    Noel
    "SOME PEOPLE CALL ME MAURICE,
    CAUSE I SPEAK OF THE POMPITIOUS OF LOVE"

  2. #2

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    '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 turd by the clean end."

  3. #3

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    From what Russman told me, they all have different gain levels. I think the 12ax7 is the highest in terms of gain, then the t7 then the u7. I think going down in gain is more kosher than going up. I would run whatever the specs say to run as a start in the MLP. I wouldnt interchange unless the instruction manual says its ok, but thats just me. I'll try to find the sight that kind of explained it


    EDIT never mind, Jesse beat me to it :)
    Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center

    2 Channel -
    Anthem Pre 2l, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Polk LSi9 w external modified Crossovers (thanks Trey!)

  4. #4

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    I've always interchanged at will. However, don't play around with the driver tubes which drive the output tubes, only the input stage.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D

  5. #5

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    Noel,

    If you can get your hands on some telefunken smooth plates 12ax7 you are going to be a very happy fellow. Oh, yea, their not cheap. :(

    The LPS Sovtek are the standard tube is that what you have?? Not a shabby tube at all. I also have used some GE 5751 witch are very nice but not quite as extended as the telee's. Happy rolling are you just leaving your cover off???????

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    Everthing Matters...Tubes Rule...and It's Over until it's Not Over

  6. #6

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    I have a couple of Teles now that I use as drivers in the ASL AV 20 monos, but I need 2 more for the MLP. I can get a matched quad of either GEs or Sylvanias in the 12Au7s or 12AT7s, for a good price and I can get them today. But if they aren't gonna work right or damage the MLP, I'll just order some NOS.
    "SOME PEOPLE CALL ME MAURICE,
    CAUSE I SPEAK OF THE POMPITIOUS OF LOVE"

  7. #7

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    Quote Originally Posted by madmax
    don't play around with the driver tubes which drive the output tubes
    madmax
    Oops, just noticed you were talking about a pre only.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D

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