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Posted

i bought a seiko 6309-7049 a few weeks ago. it cleaned up really nicely and just yesterday, i installed a beautiful sapphire crystal in it.

i have not given it a lot of wrist time only because it doesn't run very "strongly" and therefore, it is usually slow. one thing that is readily apparent is the balance turns very slow and it also does not make a complete rotation - or rather, a full swing. anyway, i have several other 6309 watches so i changed out the balance to see if things got better. they didn't. which prompts this question: could the cause of this be (aside from probably needing a service) a weak mainspring? when i wind the barrel manually, it takes right off, but eventually slows down again.

if the mainspring is weak, how would i know? if it's not the mainspring causing this slow running, what could it be?

Posted

If it were mine I would strip the whole thing down and go through it very carefully. There is to much as to why this could be happening that is why I would start from scratch. If it is more then five years old Seiko suggest the mainspring be replaced, if possable get the complete replacement as you aren't supposed to open them up.

Posted

i figured that magnetism would make it run faster because i've got one that is magnetized. it runs like a house afire.

oldhippy - it will probably come down to a complete service, anyway. probably to be better safe than sorry, i should just get a new mainspring.

Posted

i don't have a timegrapher, but i downloaded an app for my tablet - forgot the name. it is so sporadic and weak  that i cannot get a good read on it. i messed around with the regulator, but nothing changed. when i first got the watch, i figured that i could make something happen with that program. no joy.

Posted
4 minutes ago, ramrod said:

i don't have a timegrapher, but i downloaded an app for my tablet - forgot the name. it is so sporadic and weak  that i cannot get a good read on it. i messed around with the regulator, but nothing changed. when i first got the watch, i figured that i could make something happen with that program. no joy.

Probably because of poor microphone sensitivity. You definitely need a working timegrapher or equivalent application to work with mechanical watches. The one most people here use cost just $150 delivered.

Posted

i didn't realize they were so reasonable

i gotta tell you, jdm, the sensitivity on this tablet's mic is incredible. i have only anecdotal evidence, but i can watch sounds register at volumes that i can't detect - and i'm the one making the sound. that said, i'm sure a timegrapher is by far the best way to go.

Posted

Could be just a dirty movement, quite often a heap of old dried oil and gunk under the mainspring barrel, another thing is if someone has "serviced" it,nothing like too much oil to slow them down.

Another thing with Seiko's I have worked on dozens and had then adjusted spot on for time and beat error but amplitude? Whats that? I have heard of some complaining of low amplitude on their new Seiko's, I just don't worry about it now if the watch is running well and keeping good time OK, lets face without a Timegrapher we don't know what the amplitude is and still had reliable watches.

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