Post by cartridgeguyonline on May 29, 2020 17:27:49 GMT 12
Michell use a 3 point hanging suspension system with weights underneath the sub platter to even out the tension on the springs. Its a simple enough system and seems to work very well though its a bit of an art to get it all bouncing nice and evenly. (40 years of experience helps...)
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Post by michaelw on May 29, 2020 19:03:23 GMT 12
all the various heath robinson schemes to make spring suspensions perform properly is enough to drive one batty. the best spring is no spring.
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Post by Owen Y on May 29, 2020 21:39:48 GMT 12
One problem with springs is that they have very poor lateral stability (almost none). Unless I'm mistaken, no one has implemented a 'leaf spring' TT suspension. Something maybe like the Minus-K technology. 0.5Hz is sufficiently much lower than the <20Hz or so that we are typically interested in preserving. (The SOTA TT had very low frequency suspension as I recall).
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Post by Graham on May 29, 2020 22:06:08 GMT 12
For the record (pun intended ) Thorens 300 series used 3 leaf springs
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Post by Owen Y on May 29, 2020 22:14:13 GMT 12
Ah yes, the TD 316 / 318 / 320 /321 etc had a type of 'leaf spring' I believe, my memory fails me.
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Post by michaelw on May 30, 2020 9:49:01 GMT 12
yes, poor lateral stability, i recall m. fremer commenting on a sprung table's (sota?) poor compatibility with a linear tracking arm it moved across a record. also original sota springs were known to stretch, causing the platter and armboard to sag. so much for the turntable that newton would have designed !
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Member
Post by andychampionsound on Jun 6, 2020 12:39:59 GMT 12
the LP-12 is iconic, and really a thing of beauty but the economic model around upgrades they've built is nothing short of stunning! Buy the greatest turntable in the world! Okay, but it's not actually the greatest... you're going to need this new bit. and this one... and this one... yeah so the the thing we said was the best? well it was... but now... I know there have been technological and materials advancements over time, but it's amazing that you can buy a base model, and then effectively replace most of the turntable with their own products to make it better! Or buy the flagship Klimax (which sounds like an adult VHS distributor) and hold tight because next year they'll have a new upgrade.
Not knocking the turntable, it really is a beautiful machine, but it is an incredibly well orchestrated money pit. Out of interest, is there a single part of the LP-12 that hasn't been superceded by an upgrade?
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Post by Owen Y on Jun 6, 2020 15:12:43 GMT 12
Out of interest, is there a single part of the LP-12 that hasn't been superceded by an upgrade? The power cord? (I discovered that to be an easy upgrade.) Oh, and the SS top plate?
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Post by michaelw on Jun 6, 2020 16:59:16 GMT 12
we talking factory or third party upgrades ?
ex-factory the top plate has gotten thinner and has gained a small corner stud to help it fit properly and minimise rattles, no more bending the top plate just so !
funk and khan have offered carbon fibre and aluminium top plate replacements.
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Post by cartridgeguyonline on Jun 7, 2020 17:50:48 GMT 12
I dont think we can blame the Linn marketing machine for 3rd party upgrades Michael !
There have been a fair heap of factory ones over the years though, all expensive, all only to be fitted by a Linn dealer etc. Both reasons why I sold mine in the mid 70's.
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Post by michaelw on Jun 8, 2020 10:52:42 GMT 12
no blame, just determining Owen's terms of reference when he asked about the top plate. i've not heard a new linn, i lost interest in belt drives when i went jdm
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Post by cartridgeguyonline on Jun 8, 2020 12:26:53 GMT 12
Not heard a new Linn either, JDM ?
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Post by Citroen on Jun 8, 2020 13:01:22 GMT 12
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Post by cartridgeguyonline on Jun 8, 2020 16:44:40 GMT 12
Jap Disc Machine ? Just does music ?
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Post by michaelw on Jun 8, 2020 16:52:27 GMT 12
all the above plus
Japanese Direct drive Monster
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Post by cartridgeguyonline on Jun 8, 2020 17:10:43 GMT 12
Arent they all ?
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Pundit
Post by peter0c on Aug 26, 2020 17:10:19 GMT 12
I came across this advice for setting up a Linn. www.cymbiosis.com/wp-content/uploads/2015/11/Setting-up-your-LP12-Volume-III-PDF.pdf I was interested to read that the author recommends getting a set of 6 or so springs, grade them for stiffness and put the strongest near the arm where the weight is the greatest. Apparently (shock horror) the production run of the normally supplied springs are sufficiently variable to allow one to do this. Just where you get an additional 3 (unless supplied through a Linn upgrade) apart from robbing a Thorens TD160 or AR is not clear. Still, it confirms my theory as above!
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