Author Topic: DIY Linear tracking tonearm  (Read 3042 times)

Offline rgpit

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DIY Linear tracking tonearm
« on: November 15, 2013, 08:38:30 AM »
Primary System: Pioneer PLX-1000 with Nagaoka MP-150, Sony XDR-F1HD, Tascam CD200 transport, Squeezebox Touch, Benchmark DAC2 HGC, Prima Luna Dialog Two, Analog Research Velluto, Harbeth Compact 7ES-3, Elac 10" subs, Alesis Masterlink ML9600 master disc recorder

Offline Slim-Shaddy

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Re: DIY Linear tracking tonearm
« Reply #1 on: November 15, 2013, 09:16:06 AM »
Wow! Very impressive.
I am confident that an SL-1200 is capable of outperforming turntables of much higher expense with minor modification.

Offline Sir Thrift-a-Lot

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Re: DIY Linear tracking tonearm
« Reply #2 on: November 15, 2013, 10:51:16 AM »
Cool.

SunnyDaze

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Re: DIY Linear tracking tonearm
« Reply #3 on: November 15, 2013, 11:37:48 AM »
Huh. This is really neat.

Offline Reverend

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Re: DIY Linear tracking tonearm
« Reply #4 on: November 15, 2013, 01:25:10 PM »
I dig the DIY arms.   ;D

I played around with this but with an air pump so the arm would be frictionless.  Instead of using ball bearings for the arm assembly to ride on, air is pumped into the cylinder that has hundreds of tiny holes.  The arm is attached to a sleeve that slides over the tube, the air pressure providing enough power for the arm assembly to float on the slide cylinder.

Offline treos33

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Re: DIY Linear tracking tonearm
« Reply #5 on: November 15, 2013, 02:12:57 PM »
Awesome work.

Rev's idea sounds more like an air hockey table than a turntable.
Desk:
ObjectiveDAC, Technics SL-1500 w/ Grado Black Cart -> NAD 1000 pre -> Emotiva Airmotiv 4
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Creek 4330R -> DefTech StudioMonitor 450
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Onkyo TX-NR809, Rotel RB-981 -> Boston Acoustics VR-40, VR-12 Center, Soundware surrounds, Velodyne VRP-1200

Offline Jim Pittsburgh

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Re: DIY Linear tracking tonearm
« Reply #6 on: November 15, 2013, 07:01:43 PM »
very cool ....  wondering how its possible to get it to track so well across the whole surface... no anti skate etc.... gotta think this one through lol
Clearaudio Performance SEP/Talisman V2 gold,PL XP-15, Onkyo Integra DSP 8.3, Marantz SR6005, KEF Reference 5, KEF Reference 4C,KEF Q900, , Q800, HSU VFT-15H,Emptek DSA250,Krell S1500 #2 Marantz SR6007,  McIntosh1501, KEF Q600, Sunfire NHTsuper1s, Technics 1200 MkII/ Shure V15 xMR, dbx DX5 ,Jolida JD

Offline Jim Pittsburgh

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Re: DIY Linear tracking tonearm
« Reply #7 on: November 16, 2013, 12:10:52 PM »
been ruminating on that glass rod tone arm for a day now.... more to go... a mystery how the stylus being the only contact point moves  the whole assembly / mass.... without any type of anti skate compensation... seems like a lot of pressure on the stylus from the outside of the grooves...  and even though it may be frictionless (not) it is still mass.... which has to be moved on a continuous basis ...  runinating .... lol   and yet it sounds "good"  per the article. 
Clearaudio Performance SEP/Talisman V2 gold,PL XP-15, Onkyo Integra DSP 8.3, Marantz SR6005, KEF Reference 5, KEF Reference 4C,KEF Q900, , Q800, HSU VFT-15H,Emptek DSA250,Krell S1500 #2 Marantz SR6007,  McIntosh1501, KEF Q600, Sunfire NHTsuper1s, Technics 1200 MkII/ Shure V15 xMR, dbx DX5 ,Jolida JD

Offline papabearjew

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Re: DIY Linear tracking tonearm
« Reply #8 on: November 16, 2013, 02:40:10 PM »
The way it's designed unless something is going on that I don't see it's not anti-skating it needs but the opposite. There will be tremendous side force on the outside surface of the stylus. This will certainly accelerate the wear on the outside of the stylus and even more so on the outside grooves of the record. Anti-skate compensates for the natural inward forces applied to a conventional swivel tonearm that would cause wear to the inner surface of the stylus and inner grooves of the record. This inner force becomes more pronounced toward the center of the record. Thus people frequently complain about inner track distortion with swivel type tonearms. I did experience some of this distortion, though minor, with my Thorens TD-160 but none with my linear tracking ReVox tt.  Actually I don't see how this tonearm would work at all.

Offline Jim Pittsburgh

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Re: DIY Linear tracking tonearm
« Reply #9 on: November 16, 2013, 04:09:00 PM »
much better said than I could... it's what I meant, just not what I typed lol   The ClearAudio Performance SEP table I have floats the tonearm in a magnetic field, and compensates with a bit more VTF and anti skate towards the center of the record. .. and it actually works. lol But it makes it much more than interesting setting the VTF lol because it also increases VTF when moved upward meaning that the trusty old Shure scale is too high/ tall ... as are most low cost digital scales....  the game is to get the scale mesurement surface the same height as the stylus when in than album groove.
Clearaudio Performance SEP/Talisman V2 gold,PL XP-15, Onkyo Integra DSP 8.3, Marantz SR6005, KEF Reference 5, KEF Reference 4C,KEF Q900, , Q800, HSU VFT-15H,Emptek DSA250,Krell S1500 #2 Marantz SR6007,  McIntosh1501, KEF Q600, Sunfire NHTsuper1s, Technics 1200 MkII/ Shure V15 xMR, dbx DX5 ,Jolida JD