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What kind of tube is this?

Discussion in 'Amps and Cabs' started by eyeball987, May 18, 2011.

  1. eyeball987

    eyeball987 Member

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    I bought this locally off of an amp builder about a year ago and he told me that is was mainly used in old Ampeg amps for a certain spot and that I should not use it in certain spots as a AX7 replacement. I can't remember what the actual tube type is but do remember it sounding good in his test amp.

    Anyone know what type of Ei tube this is?
    [​IMG]
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  2. DGDGBD

    DGDGBD Member

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    I can't tell from looking but maybe it is a 12AU7 or a 12DW7? They are found in older ampegs. The 12AU7 has much lower gain than 12AX7; and the 12DW7 has one triode with the gain of a 12AX7 and another triode with the gain of a 12AU7.
     
  3. eyeball987

    eyeball987 Member

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    The description you gave of the 12DW7 sounds very familiar. I am almost positive that is what he said it was. Thanks for the quick response!

    Any harm/benefit for using it as a AX7 replacement?
     
  4. DGDGBD

    DGDGBD Member

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    You won't harm the amp, but it may not sound good. But you may like it, who knows? It all depends on the amp circuitry.
     
  5. ken374

    ken374 Member

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    looks like the telefunken copy ax7, might be microphonic, good v2 tube if it is
     

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