new LP12 top plate production

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johnandchris
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Hi Folks. This may be in the wrong area so Mods please feel free to move it.

I own an LP12 Sondek which i think is a wonderful piece of equipment. When developed by linn (or Ariston) it brought high qualitly turntables to the masses.

It was not without its problems however. The subchassis was pressed steel and the curved top plate (linn say pre bent to provide good anchorage but i suspect it has the curve as it came off a roll) was stainless steel and flexible. Both of these are design flaws and cause inconsistencies in set up.

I wont go into the subchassis here as there are already alternatives on the market including a new machined one from Linn, The KEEL.

The LP12, as a suspended turntable, relies on accurate setup to allow the suspension to work. With the curved top plate, it is nearly impossible to get the springs to hang perpendicular to the top plate. Indeed LINN developed a special tool for bending the springs, although how accurate this is in real life i have my doubts. Anyway, bending the bolts is a fix not a cure and can cause the top plate to bend slightly.

I have an engineering background and as i am also curious, i have looked into the top plate engineering. There is a company called Tiger Paw who make the KHAN top plate, a lovely looking piece of engineering with an eye watering introductory price of £800!!. It is a CNC machined piece of aluminium with some lovely "resonance reducing rings" on top.

It is supposed to be a great improvement on the standard subchassis as it is absolutely flat and the mounting holes for the bolts are machined in so they stand at a perfect 90 degree angle. Its engineering in this department is sound and makes sense, however i believe (my personal opinion) that although it is well made, it is over engineered. I dont subscribe to the resonance reduction claims etc, and i think a more simple option would offer all the benefits at a considerable cost reduction.

I have spoken at length with a CNC machining company and i am currently in the development process for a simple top plate using tried and tested manufacturing processes to ensure a stable, flat and simply constructed high quality top plate. Preliminary investigations indicate that the cost of one of my top plates, machined and anodised would come in, to the consumer, at about £375 to £400, so less than half the price of the KHAN.

I am having a prototype made up and will report back on the finished product, however what i am looking for is an initial indication (rough) of who may be interested. I am not looking for a definite yes or no, but opinions would be gratefully received to give me a ball park figure that i can discuss with the CNC company. I have already had a number of expressions of interest from other sources.

I have been making low cost, high quality interconnects and tonearm cables for many years and have sold hundred all over the world. I know that i have only just joined this forum, however i have been a member of other forums for years (including Audiosmile), have contributed to discussions and had a lot of help with hi-fi matters from various knowledgeable people there. As this is a dedicated LP12 item i feel that this is the best place to ascertain interest.
Feel free to leave any constructive comments (negative or positive) regarding what i am planning to do. If you wish to PM me also feel free.

Thanks in advance for your time.

John   

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33lp
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RE: new LP12 top plate production

I have no knowledge of the LP12 (being of the solid rather than "bouncy" turntable school) but I wondered if you had checked out Inspire HiFi who are offering a number of mods to Linn and other TTs as well as their own new products. They may have similar ideas to yourself.

VicJayL
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RE: new LP12 top plate production

When a manufacturer makes a highly successful product for nearly forty years, constantly updates it with retro-fitable up-grades and allows purchasers a wide range of options at various price points, why anyone would want to buy third party modifications is beyond me. I wouldn't dream of turning mine into a hybrid. Perhaps I'm missing something. 

Vic.

33lp
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RE: new LP12 top plate production

Well Vic I suppose some see it as a business opportunity. Some outfits seem to exist offering all sorts of hifi exotica I would never consider, particularly cables, but I don't want open that can of worms which popped its head out briefly in another forum topic. Apart from a bit of maintenance one of my turntables is still in regular use, un-modded, after about 42 years.

VicJayL
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RE: new LP12 top plate production

33lp wrote:

  Apart from a bit of maintenance one of my turntables is still in regular use, un-modded, after about 42 years.

Yes, it speaks for itself, doesn't it?  Very satisfying to own and use such a product. 

Vic.

c hris johnson
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RE: new LP12 top plate production

I'm still using a Garrard 401 and SME Series II arm that is now more than 50 years old, and it has never given me any trouble.  Only the cartridge (now Denon SL304) has been replaced. 

I have made copies on to CD of a number of my LPs and some of them sound (to me) better than the CD transfers made by the companies.  They ought to have better equipment (not to mention the master tapes).  Strange.

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33lp
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RE: new LP12 top plate production

Well Chris, I note the Editor/Publisher of the only HiFi Magazine I take regularly, HiFi World (because of their enthusiasm for valves & vinyl) uses a Garrard 401 (mine's a Goldring-Lenco).

I suspect your own transfers are better because you are probably not using any computerized noise reduction techniques in an attempt to "improve" the LPs although that shouldn't apply to master tape transfers but of course it's always possible the master tapes are not properly equalized to their original settings. Then of course different tape machines are employed although I believe some such as Mercury used refurbished original valve powered recorders identical with those used for making the original recordings for making CD transfers but they're probably a minority.