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Showing results for tags 'valjoux 7750'.
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Valjoux 7750: Rate Behaviour Question
Hoe posted a topic in Watch Repairs Help & AdviceDear Watchmakers I recently serviced a Valjoux 7750 and I noticed that the movement runs too fast in the first let’s say two days until it stabilises to a useful rate. With amplitudes between 300° and 264° and beat errors between 0 ms and 0.2 ms depending on the position on the timegrapher I consider the 30 years old movement as “healthy”. I installed a brand new mainspring and wore the watch during this test. I place it dial up during the night. Furthermore, I think due to my home office status and the lack of movement, it doesn’t wind enough so it is slowing down since 31st March. See my Excel diagram in the attachment. Why does it run so fast at the beginning? Is something wrong or is this a normal behaviour? Somewhere I read that watchmakers regulate watches after they ran for 24 h. Best wishes
Hi, I am new to watch repair and have mainly been servicing simple eta movements for my own I have always wanted a chronograph watch and have found a watch based on a valjoux 7750 with a broken case. I want to put the movement into a new case but the dial is a day date and the movement is date only. I have sourced all the parts and have fitted them to the movement to add the day function. The donor watch didn't use a dial washer / foil, do I need to use one now I have added the day indicator? If I do need a foil, what size and where from? Thanks very much Stuart