Layered plinth for SP-10 - diyAudio
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Old 3rd September 2007, 05:07 PM   #1
jlsem is offline jlsem  United States
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Default Layered plinth for SP-10

Here is a picture of a layered plinth I made for a friend of mine. It is made up of random layers of Baltic birch plywood, solid basswood, and aluminum. It is covered with 1/8" wenge veneer.

John
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Old 3rd September 2007, 05:24 PM   #2
jlsem is offline jlsem  United States
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I sorry, for some reason the photo won't load. I'll try again later.

John
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Old 31st October 2007, 04:34 AM   #3
jlsem is offline jlsem  United States
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Default One more once

O.K., the pictures of the plinth I built for my friend Albert Porter are now up on this website:

http://www.soundfountain.com/amb/sp10plinth.html

It can also be seen here:

http://cgim.audiogon.com/i/vs/i/f/1193606055.jpg

A very interesting project with a surprisingly good result.

John
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Old 1st November 2007, 08:08 AM   #4
JCLNV is offline JCLNV  Canada
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Very nice work.
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Old 2nd November 2007, 04:04 AM   #5
jlsem is offline jlsem  United States
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Thanks! The salient feature of that plinth is the grey cast iron block which is coupled by a brass rod to the bottom bearing of the motor and acts as vibration sink. The result was an amazingly quiet turntable - actually more quiet and with blacker backgrounds than the Walker Proscineum. Not at all what we expected.

John
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Old 2nd November 2007, 08:28 AM   #6
AuroraB is offline AuroraB  Norway
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Quote:
Originally posted by jlsem
Thanks! The salient feature of that plinth is the grey cast iron block which is coupled by a brass rod to the bottom bearing of the motor and acts as vibration sink.

John
Would you elaborate somemore on this one??
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Old 2nd November 2007, 01:23 PM   #7
jlsem is offline jlsem  United States
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Any electric motor produces some noise, and a direct drive turntable motor is coupled directly to the platter and is not isolated from the rest of the 'table. The moving coil cartridges used have outputs on the order of 200-600 microvolts, so noise is obviously an issue. The grey cast iron block has a very high specific damping factor (highest among commonly available materials) and the brass rod makes a convenient transfer path for noise and vibration to the iron block, where they magically disappear. This base is admittingly a brute-force solution to the problem, but it worked very well.

John
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Old 2nd November 2007, 01:29 PM   #8
AuroraB is offline AuroraB  Norway
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DUH! Of course, direct drive!
I guess my brain wasn't awake yet, this morning....
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Old 2nd November 2007, 01:35 PM   #9
jlsem is offline jlsem  United States
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I kind of had a feeling that you hadn't realized that this was a direct drive application.
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Old 2nd November 2007, 07:13 PM   #10
Cobra2 is offline Cobra2  Norway
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Quote:
Originally posted by jlsem
Any electric motor produces some noise, and a direct drive turntable motor is coupled directly to the platter and is not isolated from the rest of the 'table. The moving coil cartridges used have outputs on the order of 200-600 microvolts, so noise is obviously an issue. The grey cast iron block has a very high specific damping factor (highest among commonly available materials) and the brass rod makes a convenient transfer path for noise and vibration to the iron block, where they magically disappear. This base is admittingly a brute-force solution to the problem, but it worked very well.

John
What noise? What problem?
"What HiFi" + other reviewers did measurements of niose/rumble++, and found it better than most high-end belt-drives (of it's time)...

Arne K
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