Hairline crack or molding mark?

Discussion in 'Amps and Cabs' started by twinrider1, Sep 6, 2008.

  1. twinrider1

    twinrider1 Member

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    Received some SED -C- tubes and have a few questions. I don't have much experience with tubes overall and none with SED's.

    Two appear to have a hairline crack that runs vertically up the side of the tube. They just enter the curved portion, top and bottom. The tubes have not frosted at all. I have not installed them. Is this reason for concern?

    Some have small bubbles in the glass at the base. Less concerned about it, but wondered if it's common.

    Thanks!
     
  2. SatelliteAmps

    SatelliteAmps Member

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    Do they work? If so, not a crack. Pictures sure would help.....
     
  3. twinrider1

    twinrider1 Member

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    Haven't installed them yet. Didn't want to complicate their return to the seller in case they frosted up on me.
    [​IMG]
    [​IMG]

    Thanks for looking.
     
  4. drbob1

    drbob1 Silver Supporting Member

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    Doesn't look like a crack to me, more of a scratch. I'd try em out...
     
  5. twinrider1

    twinrider1 Member

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    Seems like even if it's just a scratch, it's a place for stress to gather when they get hot. I should have a probe here in a day or two. I'll give them a shot.
     
  6. SatelliteAmps

    SatelliteAmps Member

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    It's a manufacturing mark. Too straight to be a crack.
     
  7. twinrider1

    twinrider1 Member

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    Thanks. Glad to hear it!
     
  8. mc5nrg

    mc5nrg Supporting Member

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    If there was a crack in the glass, the tube would appear white inside and be pretty obviously blown/lost vacuum.
     

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