7750 movement, hessitation, jittery sweep second hand on Chrono

Thread: 7750 movement, hessitation, jittery sweep second hand on Chrono

Results 1 to 8 of 8
  1. #1
    Member
    Join Date
    Oct 2008
    Location
    SF Bay Area
    Posts
    221

    7750 movement, hessitation, jittery sweep second hand on Chrono

    Has anyone see a 7750 ETA/Valjoux movement that had a sweep second hand for the chrono that had a jittery movement? I just received a brand new auto chrono from an AD that has a rough sweep second hand. It seems to stall then move a little faster to catch up. It seems to still complete the 1 minute cycle on time but looks terrible while it is doing it.

    Any thoughts? other experiences?

    Thanks,
    Andy

    Oh by the way it is being exchanged for another piece, I just want to know that it will not be the same in the next one.

  2. #2
    G-Shock Mod stockae92's Avatar
    Join Date
    Feb 2006
    Location
    Southern California - USA
    Posts
    13,611

    Re: 7750 movement, hessitation, jittery sweep second hand on Chrono

    i think some 7750 acts like that, while so doesn't (or less noticeable)

    i think that's normal and it doesn't seems to affact timing

    i say don't worry about it and enjoy the watch

  3. #3
    Member
    Join Date
    Jul 2008
    Location
    SF Bay Area
    Posts
    903

    Re: 7750 movement, hessitation, jittery sweep second hand on Chrono

    depending on how big the seconds subdial is, I don't think this is abnormal

  4. Remove Advertisements
    WatchUSeek.com
    Advertisements
     

  5. #4
    Member
    Join Date
    Mar 2008
    Location
    San Francisco Bay Area
    Posts
    1,915

    Re: 7750 movement, hessitation, jittery sweep second hand on Chrono

    I've only played with a few watches with the 7750 movement, but I've not seen that. The stopwatch's second hand always moved smoothly. Take a look at other watches that the AD has that uses that movement. If a number of them have that problem then perhaps it's normal. However, if every other one has a very smooth running seconds then you should be able to get yours exchanged.

  6. #5
    Member RJRJRJ's Avatar
    Join Date
    Apr 2008
    Location
    Los Angeles
    Posts
    5,409

    Re: 7750 movement, hessitation, jittery sweep second hand on Chrono

    Mine doesnt have that, and it would annoy the hell out of me if it did.

  7. #6
    Member lysanderxiii's Avatar
    Join Date
    Oct 2006
    Location
    N 32 deg, 47' 27.9168"; W 79 deg, 54' 30.3372"
    Posts
    8,842

    Re: 7750 movement, hessitation, jittery sweep second hand on Chrono

    The chronograph second hand of the ETA 7750 is an indirect second hand, there is a spring with a nylon cup that regulates the tension on the second hand wheel (chronograph friction wheel spring), this is weak or the oscillating pinion need adjustment.

  8. #7
    Inactive
    Join Date
    Nov 2007
    Location
    about the middle of the block
    Posts
    661

    Re: 7750 movement, hessitation, jittery sweep second hand on Chrono

    My Hamilton does that, but only slightly. I noticed it when I first got it, but it isn't significant and I don't really care about it anymore. This is probably something that is a bit more common with the lower grade 7750s, but I'm no expert.

  9. #8
    Member
    Join Date
    Jul 2008
    Location
    World
    Posts
    793

    Re: 7750 movement, hessitation, jittery sweep second hand on Chrono

    Quote Originally Posted by RJRJRJ View Post
    Mine doesnt have that, and it would annoy the hell out of me if it did.
    same here, no problem.

    best,
    Paul

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •