See an ancient test eqipment !!

Discussion in 'Microphones & Recording' started by Big K, Feb 21, 2011.

  1. Big K

    Big K Well-Known Member

    Joined:
    Jan 16, 2002
    Location:
    Munich / Germany
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    See an ancient test equipment !!

    Hallo,
    A few days ago I saw this little device and had to take a wild guess what it actually was.
    After some research I found out:

    It is a Siemens microphone test device. No plug and no lead is going in or out, but when you turn it over it makes a rattling noise like a rain maker with larger grains in it. Little steel balls patter on the speaker-cone-like membrane for an extended even-leveled 94 dB noise floor. You place it exactly 10 cm infront of the microphone's membrane for calibrating mics or pre-amps.

    Do you have an old or unknown and rare gadget, too?
    Feel free to post it here, as well...

    :smile:

    BILD0635.jpg BILD0634.jpg BILD0633.jpg
    Siemens Eichtonquelle Click on me!
     
  2. moonbaby

    moonbaby Mmmmmm Well-Known Member

    Joined:
    Feb 23, 2005
    Location:
    jacksonville,fl
    Cool device! I often wondered how manufacturers tested the sensitivity of their mics, what a great concept. Sure beats the heck out of having Hans standing in front of the mic and reciting the Gettysburg Address...:)
     
  3. Davedog

    Davedog Distinguished Member

    Joined:
    Dec 10, 2001
    Location:
    Pacific NW
    Is Hans getting off-stage cues from Gretel?
     
  4. moonbaby

    moonbaby Mmmmmm Well-Known Member

    Joined:
    Feb 23, 2005
    Location:
    jacksonville,fl
    Yeah, that would make it the "Gretel's First Address", wouldn't it?
    DD...I haven't forgotten ya, just waiting on the 2nd opinion...
     

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