DIY linear tracking arm

0 Members and 1 Guest are viewing this topic. Read 29293 times.

PDR

  • Full Member
  • Posts: 820
  • May the best man win
DIY linear tracking arm
« on: 22 Sep 2013, 10:53 pm »
Was so impressed by this thread at DIY Audio, I thought I'd give it a try.
http://www.diyaudio.com/forums/analogue-source/238027-diy-linear-tonearm.html
Its kinda like the Cantus Opus 3, but the bearings ride on top of the glass tube.

I've taken an Old TT and damped the heck out of it, built a new MDF housing.
I'll try the new arm on it and see how it preforms....if decent I'll finish it nicely.

This is what I've got done this weekend, but am out of town for the next 10 days
so that will be it for now. Head shell and counter weight is next.












PDR

  • Full Member
  • Posts: 820
  • May the best man win
Re: DIY linear tracking arm
« Reply #1 on: 7 Oct 2013, 12:14 am »
No mucho interest eh?..... :scratch:

Tough, I'm just going to keep posting..... :green:
I work out of town for 10 days then home for 4, so its going to be sporadic.

This weekend I managed to get the Turntable itself dressed up....it was a little ugly
after I skinned it out in MDF. The veneer is a cherry, stained cherry and the perimeter
is unfinished Aspen.....I like it.

The arm has a headshell now, its also Aspen. I need longer screws for the cartridge.
The one that is on right now is an old Shure M55E

The counterweight is a bit heavy so a new one is in the works....hence the 35 cents.
My wife walked up looked at the quarter and dime...mumbled something about the cheapest audio
addition shell ever see....















Bob in St. Louis

  • Volunteer
  • Posts: 13260
  • "Introverted Basement Dwelling Troll"
Re: DIY linear tracking arm
« Reply #2 on: 7 Oct 2013, 12:32 am »
ooHHHH !!!!!!!  :o
I'll be following this, fo sho!

Neat project dude. I like to build neat stuff. Don't really care much about what it is. But this is cool. Real cool.
I, for one, would love to follow your progress. I'm a vinyl noob, and a linear tracking arm ultra-noob, so please don't ask any hard questions.

Good stuff man. Rock on.
Bob

a.wayne

  • Full Member
  • Posts: 685
Re: DIY linear tracking arm
« Reply #3 on: 7 Oct 2013, 12:42 am »
Good job pdr , i like its clean look , did you post this over on DIY ..?

dlaloum

  • Full Member
  • Posts: 710
Re: DIY linear tracking arm
« Reply #4 on: 7 Oct 2013, 12:59 am »
Beautiful!

I'll keep lurking and enjoy the show...  Nice work.

Guy 13

Re: DIY linear tracking arm
« Reply #5 on: 7 Oct 2013, 01:56 am »
Hi PDR and all Audio Circle members.
I admire people like you that create beautiful things... :thumb:
Don't stop, keep,posting pictures and comments.
By the way, I am curious to know where you bought the glass tube?

Guy 13
« Last Edit: 7 Oct 2013, 10:53 am by Guy 13 »

Bob2

  • Full Member
  • Posts: 1850
  • De gustibus non est disputandum
Re: DIY linear tracking arm
« Reply #6 on: 7 Oct 2013, 10:43 am »
I'm interested... keep going!

neobop

  • Full Member
  • Posts: 3446
  • BIRD LIVES
Re: DIY linear tracking arm
« Reply #7 on: 7 Oct 2013, 11:05 am »
Cool project.  I love stuff like this. 
Thanks for posting.
neo

Nick B

  • Full Member
  • Posts: 962
Re: DIY linear tracking arm
« Reply #8 on: 7 Oct 2013, 08:08 pm »
Great job! I'm fascinated by the project and will continue to follow it   :thumb:

PDR

  • Full Member
  • Posts: 820
  • May the best man win
Re: DIY linear tracking arm
« Reply #9 on: 8 Oct 2013, 05:58 pm »

By the way, I am curious to know where you bought the glass tube?

Guy 13

I'll keep you guys posted, but my work keeps me away from home
so it will be updated every 10 days or so

Guy, believe it or not I thought it would be as easy as finding a medical
supply outlet and picking the tubes up..... :duh:
I finally found a glass blower...in Canada that means Bong builder...and he
hooked me up....in a matter of speaking.....5 bucks a length.

yeldarb

  • Jr. Member
  • Posts: 258
Re: DIY linear tracking arm
« Reply #10 on: 14 Oct 2013, 01:30 am »
would damping the glass tube internally with urethane foam be something to consider?

PDR

  • Full Member
  • Posts: 820
  • May the best man win
Re: DIY linear tracking arm
« Reply #11 on: 21 Oct 2013, 06:36 pm »
I've had this going for a few days now.

I used an old Technics headshell modified to
fit the carbon rod. Had to lessen the counter weight...
now there are 2 classy looking nuts..lol.

The wire is nothing more than earbud wire.

For fear of ruining a good cart on the first few maidens
I opted for a very old  AT 13Ea, with an old $18 needle,
I have 2 more of these needles lying around.....excellent
for ripping, grinding or tearing any record I want to destroy
with this new arm....or so I thought.

The first album I tried was a crappy one.....I have lots of these.
To my amazement it worked right from the get go....the arm
slid down the length of the glass tube....wasnt really listening
to what was coming out, was way more interested in how
everything was working......it worked fine. Another crappy album
and I was all done with tinkering, leveling, lining up the arm properly.

Now I choose a good album. One I knew was in perfect shape, one
I knew inside and out.....Brothers in arms.
I've listened to this album on my Raysonic 128 CD player dozen of times,
its one that I audition my system to my friends with.
I'd listen to it on my Rega 3, with an AT 440MLa just before replacing it
on the stand with the Linear Tracker.

Wow, then I said Wow again.
This arm with that old AT13 on it was just slaying
my Rega (RB300).....

So, like I said, I've been listening for a few days.
I'm going to take the assembly that holds the tube
and levels it off. I'm going to design a better one,
now that I know what it can sound like, it deserves
better.....I just didnt expect this kinda quality, so
I didnt put the effort in that I should of.....but I will now.

Dont know if anyone else is considering this build.
If you are, go for it, you wont be disappointed.








SteveFord

  • Volunteer
  • Posts: 6436
  • The poodle bites, the poodle chews it.
Re: DIY linear tracking arm
« Reply #12 on: 21 Oct 2013, 11:01 pm »
I guess the Rega goes up for sale?

PDR

  • Full Member
  • Posts: 820
  • May the best man win
Re: DIY linear tracking arm
« Reply #13 on: 21 Oct 2013, 11:17 pm »
No....I'm a hoarder, always have been, always will be.... :thumb:

Probably will go into the future living room system. I have a nice amp sitting here
from A guy in Texas named James, he rebuilt it, an old Magnavox from 1953
I need to build a pair of X-Statiks to pair with the amp and Rega.

My wife was just saying the other day how bare the living room looked with
no stereo gear in there...... :wink:.....or take out the garbage, it was one
or the other......

Grbluen

  • Jr. Member
  • Posts: 236
Re: DIY linear tracking arm
« Reply #14 on: 22 Oct 2013, 09:03 am »
Awesome job! Maybe one day I'll give it a try. I know it's a bit off topic, but I'm a big fan of the AT-13ea.
I think it's an underrated cart.

PDR

  • Full Member
  • Posts: 820
  • May the best man win
Re: DIY linear tracking arm
« Reply #15 on: 5 Nov 2013, 06:51 pm »
I made a quick video of the TT and tonearm in my
room with my GR Super Vs.
I've spun over 100 LPs and it works very well.....sweet.
I'm not much of a country music fan, but I do like Dolly, Linda and Emmy....

http://www.youtube.com/watch?v=4sVJ435Apl8&feature=youtube_gdata

BobM

Re: DIY linear tracking arm
« Reply #16 on: 5 Nov 2013, 07:36 pm »
I was hoping to see how you cue up the arm. Is it basically always in the "down" position when it is hanging there or is there some mechanism to lift it to a stand or to hold it up off the record surface, or something?

The whole shebang looks really nice. You should be proud of this work.

PDR

  • Full Member
  • Posts: 820
  • May the best man win
Re: DIY linear tracking arm
« Reply #17 on: 5 Nov 2013, 07:48 pm »
Thanks, I DIY everything in there cept the amp and CD player.
I'm getting older and seem to tinker more than I ever have.

The arm is cued up and down by a brass rod, sent through the
wood base with a bend for a lever, its simple and works very well

The hardest movement is to get the arm back to the start position.
I'm going to have to attach a small handle to guide the arm back.









PDR

  • Full Member
  • Posts: 820
  • May the best man win
Re: DIY linear tracking arm
« Reply #18 on: 7 Jan 2014, 03:22 am »
Well, since the last post on this thread I've made a few changes.
I came up with a design change that reduced the weight of the tone arm quite a bit.
The total weight now is just a tad over 20 grams....this is with the cartridge and counter weight attached.
Absolutely no tracking...skipping...problems and its worked out so well I've modded a Rega P3
to accept one of these tonearms, to see what the difference is from the direct drive DIY table.

What I did was to lay two glass tubes side by side and eliminate one of the sets of bearings.
The 2 bearings now ride the rail created between the two tubes. I still have the 4 points of contact
on the glass with the bearings.....like the Cantus or Clearaudio, I'm just riding on top instead of inside the glass tube.

I have a few hundred hours on this tonearm now and wow, it just blows me away everytime I que a record.

Heres a pic and a video of the double tube on the DD table



Video:
http://www.youtube.com/watch?v=cMxef-m5PTI&feature=youtube_gdata

Heres a few pics of the new tone arm set up on the Rega. An improved design easier to level the tubes
with set screws. No wood all acrylic on this one.






tull skull

  • Full Member
  • Posts: 308
  • I can't send hare in search of anything!
Re: DIY linear tracking arm
« Reply #19 on: 7 Jan 2014, 04:04 am »
your solution for removing a set of the bearings is really clever. You have done a really good job. Hope you will be able to compare and comment if you think the reduced weight made an improvement. How did you go about making sure the two tubes are parallel?

Also how did you attach the headshell to the rod and did you incorporate any adjustment control for perpendicularity or other facets of alignment?