component ID help

Discussion in 'General Electronics Chat' started by ed williamsen, Nov 4, 2012.

  1. ed williamsen

    Thread Starter New Member

    Nov 4, 2012
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    trying to identify a component.
    I have what looks like a signal diode ( small glass envelope). It has color bands of yellow, yellow, white or possibly gray and finally yellow bands. Of course it is open and I need to replace it. It is in a base bais circuit in a engine tachometer used in a 1966 GM car. I want ot repair the unit rather than replace it. The board has two other similar components banded blue, green, brown. These both measure .3 ohms.
    Thanks in advance for any help!!
    ed Williamsen
     
    Last edited: Nov 4, 2012
  2. MrChips

    Moderator

    Oct 2, 2009
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    It would be best for you to post a clear, well focused photograph of the board.
     
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  3. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    if it is a diode, it will probably be an OA91 germanium type of that year, or its a zener.
     
    Last edited: Nov 5, 2012
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  4. bertus

    Administrator

    Apr 5, 2008
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  5. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Old transistor engine tachos often used a mid voltage glass zener around 7v, as a crude "regulated voltage" for the monostable freq detector.
     
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  6. ed williamsen

    Thread Starter New Member

    Nov 4, 2012
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    Hello thanks for the input.
    Ed Williamsen
     
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