help identifying a 12ax7 tube

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Gary Brennan, Jul 26, 2008.

  1. Gary Brennan

    Gary Brennan Old cavorting member Gold Supporting Member

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    Can anyone guess who made this 12ax7- came from an old Masco office intercom, tube said Masco on it and Made in USA, the plates are dark grey (but not black) and ribbed, 1.9 cm tall counting the portions protruding thru the 2 micas. Below the X of 12AX7 (large characters right where the top curves) are 6 dots in the same label ink, set up in 3 vertical rows, the first row has 3 dots, the 2nd has 1 at the bottom position, the 3rd has 2 at the top and middle position. No other visible markings.

    Seems to sound good. Any educated guesses? I know Masco was on Long island NY as was Amperex...? Thanks

    GB
     
  2. alltone

    alltone Member

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    Can't help with the identification but...Cool pic...looks like something from the "X Files"
    Cheers..
     
  3. mockoman

    mockoman Member

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    The dots usually mean GE...
     
  4. rockon1

    rockon1 Member

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    A picture is worth a 1000 words! Bob
     
  5. Blue Strat

    Blue Strat Member

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    +1, or +1000.

    And yes, etched dots and a stencil like font usually means GE.
     
  6. Gary Brennan

    Gary Brennan Old cavorting member Gold Supporting Member

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    Thanks guys, I don't know how to post a pic here. Needs to be hosted elsewhere, yes? I'll assume its a GE.

    gb
     
  7. rockon1

    rockon1 Member

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    I host my pics here. Its simple and of coarse free. Just upload the pic to thier site. I like to click on it for a full size image(to see if its clear enough) then I right click the image,hit properties and copy the adress. Bob


    http://tinypic.com/


    heres a GE long plate.

    [​IMG]
     
  8. Gary Brennan

    Gary Brennan Old cavorting member Gold Supporting Member

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    Bob, this looks just like it, except its missing or not showing the stencil dots. Are these considered to be good sounding tubes? One more feature- the getter looks like a large horseshoe with the open ends connected.

    gb
     
  9. rockon1

    rockon1 Member

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    Some have dots,some dont. U shaped getter is fairly typical of a lot of the GE long plates I have. Only you can decide whether they are good sounding... Depending on the amp I like them. To my ears they have a slightly softer high end which can help bright amps. Bob
     
  10. Gary Brennan

    Gary Brennan Old cavorting member Gold Supporting Member

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    I tried it in V1 of a Glaswerks, compared to a Bugleboy it sounded warmer but less hifi, yet still balanced. Not worse just different. Thanks again for the posting tip.

    gb
     

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