Valjoux 7750 Question, Help Needed!

Thread: Valjoux 7750 Question, Help Needed!

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  1. #1
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    Valjoux 7750 Question, Help Needed!

    Hello all, I recently got an Accutron 26C02, which uses a Valjoux 7750, and I have a question. When using the chronograph function and the 12 hour sub-dial points exactly at 1 (meaning 1 hour has passed), the 30 minute sub-dial says that only 55 minutes has passed, so it seems the hour counter is running a bit fast. Although when it's reset to zero, all 3 hands are aligned properly. Is this normal, or is there a way to realign it? It annoys me a lot to see this misalignment, perhaps it requires a service? It's only 4 seconds fast over the course of 4 days, or +1 sec daily. What do you guys think?

    Thanks in advance .
    Last edited by In_Front; April 14th, 2010 at 05:21.


  2. #2
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    Re: Valjoux 7750 Question, Help Needed!

    The subdial is about 10 mm in diameter.

    That means each hour division is 2.618 mm wide.

    So, 5 minutes is 0.218mm, or about the width of a printed line.

    After six hours does the hour counter pick-up half the distance between hour tick marks? If not I wouldn't worry about it, just remember that the pointer is inside the current hour.
    familiaritas parit contemptum; raritate admiratione wins.- Lucius Apuleius
    est necessry, accurate ad secundo? - Lysander magna
    iustum est horologium - Obscurus Genius

  3. #3
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    Re: Valjoux 7750 Question, Help Needed!

    Quote Originally Posted by lysanderxiii View Post
    The subdial is about 10 mm in diameter.

    That means each hour division is 2.618 mm wide.

    So, 5 minutes is 0.218mm, or about the width of a printed line.

    After six hours does the hour counter pick-up half the distance between hour tick marks? If not I wouldn't worry about it, just remember that the pointer is inside the current hour.
    Good idea, I'll try timing 6 hours and see where it points.


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