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Old 23rd July 2003, 07:40 PM   #11
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Hi,

Great job, Christian.

Cheers,
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Old 23rd July 2003, 07:53 PM   #12
grataku is offline grataku  United States
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Astounding! It makes me want to go back to vinyl!

I'll be saving that up for my middle life crysis.
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Old 24th July 2003, 06:16 PM   #13
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Default Very stylish!

Congrats, Chishu!
Good example of straightforward engineering on the remarkable aesthetic background! Some technical questions: how the brass weights are connected to the platter? How much weight is added? Have you evaluate the sonic contribution of each element (added weight and new string) apart? What is polyamide string?
Thanks,
Michael
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Old 25th July 2003, 06:40 AM   #14
krishu is offline krishu  Europe
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Hi Michael

on the lower side of the platter there is a groove (1cm wide and 1cm deep), where I put in some pvc "dowels" which I made by myself. The position was set with the help of a CAD stencil. The brass weights have a threaded hole and are srewed into the dowels. each brass weight is exactly 303 grms, there are six of them added now. They are cnc machined.
The Improvement was quite huge. The music was less nervous and plays at ease now.

The polyamide string is "invisible sewing yarn" and was about $2/200mtrs. The string is less elastic than the rubber belt i used before, it has less grip, too. This causes that less motor vibration is transferred to the platter. The improvements were not as dramaticla as the above mentioned, but by testing speed with my strobe light the speed accuracy was much better. This is sonically noticable when long high notes are played like piano, bright female voice or so. I tested it with 1kHz test tone, too and the improvement was clearly audible. The rubber belt tended to oscillate.

The Platine Verdier as well as Amazon Tuntables use a similar string.

See also thread "Lets make a DIY audio TT", there is something said about (vcr) tape belt, if I recall correctly.

Hope this helps

Cheers
Christian.
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Old 25th July 2003, 08:45 PM   #15
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Default Nothing beats pure mass

Hi Christian,
Thank you for your description, threaded connection supposed the best for mechanical coupling. Just my thought: why don't you try to add six more brass weights?- seems you have enough space. I red once an article about monstrous french TT "Satie"- they claimed 40 kg platter sounds better than 30 kg one - nothing beats pure mass!
Another point: your feet cones are pierced directly to the wooden platform - I'd prefer more predictable contact with the brass discs in between. I did it for my TT sitting on the marble plate - works good to me.
Regards,
Michael
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Old 25th July 2003, 09:00 PM   #16
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Hi,

Quote:
I red once an article about monstrous french TT "Satie"- they claimed 40 kg platter sounds better than 30 kg one - nothing beats pure mass!
The platter on mine weighs in at 40 Kgs. The lot tips the scales at 55 Kgs.

Cheers,
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Old 10th December 2003, 06:56 AM   #17
krishu is offline krishu  Europe
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Hello to everybody;

meanwhile I changed something on my DIY TT, mainly the platter and its weights;

I saw the links to the pictures in my first posts are broken, so here is the brass weights platter again:

Click the image to open in full size.

I replaced those brass weights by a really heavy and nicely machined aluminium platter. I milled an inner platter for that and put the aluminium platter underneath the acrylic one. In the same time I polished the acrylic platter.

Click the image to open in full size.

Click the image to open in full size.

The belt now is an invisible polyamide string (way better than that rubber belt), the motor is still a pll-regulated DC type.

More detailed information can be found on my website.

A new tonearm will be finished around christmas (a schroeder clone), I'll be back here to report.

Cheers
Christian.
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Old 11th February 2004, 09:33 PM   #18
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Very beautifull , all you need now is this.
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Old 12th February 2004, 07:05 AM   #19
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Hi,

JerryT,

Can you remind me who made this record puck?

I've seen it before but can't seem to put my finger on it...

TIA.

Cheers,
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Old 12th February 2004, 07:12 AM   #20
Werner is offline Werner  Europe
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Thorens?
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