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12ax7 the same as 12x7 tubes?

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  • 12ax7 the same as 12x7 tubes?

    hi are the 12ax7 tubes the same as the 12x7 tubes?
    Michael Kelly Patriot Black w/Rockfield Fat Ass set
    Roland Microcube

    Rotosound Strings

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    Dunlop Jazz III and Ultex Picks

  • #2
    Re: 12ax7 the same as 12x7 tubes?

    Originally posted by SepultuRick
    hi are the 12ax7 tubes the same as the 12x7 tubes?
    Both are 12v tubes and probably have the same pinouts,but I've never heard of anyone using the 12X7 as a sub for the AX7?
    Amps: 66 Fender BF Pro Reverb Combo,1973 50 Watt Marshall Head,Marshall 4x12 A/V Cab,Vox ToneLab LE,Vox VTH Valvetronix 120 Head,Vox AD 2x12 Cab,Roland Cube 20X

    Guitars: Several Stratocasters,2 Fender Telecasters,Gibson SG Standard,Tokai Love Rock Les Paul,Dean Acoustic.

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    • #3
      Re: 12ax7 the same as 12x7 tubes?

      k i am confused now!!!!

      my preamp apparantly uses 2 12ax7 tubes where as my power amp uses to el34s and a 12x7.

      so me buying 3 12ax7 tubes will not do the job?
      Michael Kelly Patriot Black w/Rockfield Fat Ass set
      Roland Microcube

      Rotosound Strings

      Shure SM57 mic
      Dunlop Jazz III and Ultex Picks

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      • #4
        Re: 12ax7 the same as 12x7 tubes?

        Yes, 3 12AX7's will work. That's exactly what your amp has.

        Oh, crap. There's a typo on my page...

        Be right back. Gotta fix that.

        EDIT: It's fixed now.

        BTW, that 12AX7 in the power amp is the phase inverter. Do a google search for "tube amp phase inverter" and you'll get some good stuff to read.
        ErikH
        Mojo's Minions
        Last edited by ErikH; 12-17-2005, 12:02 PM.

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        • #5
          Re: 12ax7 the same as 12x7 tubes?

          Basically the phase inverter is the last pre-amp, the one closest to the power tubes. Pre-amp tubes actually have is separate parts in them. The phase inverter just takes the signal after its processed by the other pre amp tubes and sends it to the power tubes.
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