'62 Princeton: 7025 vs. 12AX7?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by bizzwriter, Feb 15, 2012.

  1. bizzwriter

    bizzwriter Member

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    I originally posted this yesterday in the amps and cab section, but I think it makes more sense over here. :huh

    I just picked up a gorgeous, bone stock '62 Princeton. Quick question: I'm going to put in some NOS preamp tubes I've got hanging around. The tube chart calls for a 7025 in the first position. Are there any potential advantages to putting a 12AX7 in this position vs. the 7025? Any reason to absolutely stick with the 7025? I've got a NOS RCA 7025 and lots of old RCA/Mullard/Amperex/Mazda 12AX7s to play with.

    Thanks!
     
  2. twangbanger

    twangbanger Supporting Member

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    The 7025's are just screened for low noise and are 12ax7's . Experiment away !
     
  3. 19181911

    19181911 Senior Member

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    12AX7WA was also a low noise tube in addition to the 7025
     
  4. guitarcapo

    guitarcapo Senior Member

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    I never hear much difference with noise on those.
     
  5. Zerksies

    Zerksies Member

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    The 7025 is a beefer tube made for military specs. A 12ax7 will work just fine. 7025's are harder to come buy and can be way more expensive versus a 12ax7. And most modern amp companies mark a 12ax7 as a 7025. it's the same tube
     
  6. bizzwriter

    bizzwriter Member

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    Thanks for the tips, guys -- I'll play around with a bunch of different tubes and see which combo this particular amp likes best.
     
  7. Peteyvee

    Peteyvee Premium Platinum Member

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    My money is on the RCA, at least that's my old '63 Princeton used to like. Have fun!
     
  8. Tele Wacker

    Tele Wacker Member

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    Let your ear tell you the difference.
     
  9. Peteyvee

    Peteyvee Premium Platinum Member

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    That too!
     

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