Ladegaard tonearm - the real DIY winner - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th December 2002, 09:19 PM   #1
diyAudio Member
 
Join Date: Aug 2002
Location: israel
Default Ladegaard tonearm - the real DIY winner

Hi guys!
Being an engineer mysef, I never thought such a piece of precise engineering like tonearm may be succesfully build "on the kitchen table". Yet the brilliant design of Poul Ladegaard has really changed my mind. I hope my experience of building air bearing tangential tonearm may be useful for someone want to improve his analog front end without spending alot of funds.
Original Ladegaard design is well described by Roscoe Primrose in his site. My modification points mainly are:
1. VTA on-flight adjustment mechanism: Dennesen-style linkage, using small ball bearings, aluminium profiles filled with lead casting into it and then glued with epoxy. This is the most time/money consuming part, but not a must for the less sensitive to VTA cartriges, like Shure V15.
2. Light wooden arm. The reasons are: 1)low pressure air bearing is not perfectly stiff and therefore should not be loaded by the high arm mass, and 2) light arm can handle non-concentric LP better. There are two versions: 3mm pine beams/1.5 mm plywood framework and pine/balsa wood, even lighter. Aquarium pump drives them easily. There was no significant sonical difference between them, but the lighter arm can really dance on very non-concentric vinyl (3-4 mm) with no audible effect. The light arm dictates high compliance cartrige: Shure V15 was the obvious choise.
3. Wide base vertical bearing (took from the old cardan tonearm). Wider base makes the whole bearing stiffer.
4. Separate 3-points adjustable base for the arm and platter. Precise overhang and 3-D angle adjustment is essential, both for the tonearm and platter.
Overall, I'm happy with this arm: Shure V15 does really sing without annoying arm resonances, driving me mad with the Project 6.9 (pretty audible through headphones). I can live with this set up even using mediocre electronic - integrated NAD 304 and enjoy my beloved classic records (much more demanding than jazz and rock). Currently I use the Project 6.9 platter - homebrewed platter will be the next step. Planning to get EAR phono stage - I feel this arm will do its best with the appropriate platter and amplifying.
Comments, questions are wellcomed.
Attached Images
File Type: jpg my arm.jpg (47.9 KB, 10214 views)
  Reply With Quote
Old 26th December 2002, 09:22 PM   #2
diyAudio Member
 
Join Date: Aug 2002
Location: israel
Default Ladegaard tonearm

One more picture
Attached Images
File Type: jpg arm-framework.jpg (53.7 KB, 10116 views)
  Reply With Quote
Old 26th December 2002, 09:38 PM   #3
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default CONGRATS

Hi,

Marvelous piece of engineering!

Have you applied a bit of breaking fluid to the bearings?


Cheers,
__________________
Frank
  Reply With Quote
Old 27th December 2002, 02:13 AM   #4
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Default Very impressed

I keep hearing good things about this arm, but I looked at it and thought, nah, something like that really can't work well can it? I'm finally convinced to give it a go., when the current round of projects are finished next year. I just bought another SAEC, so that makes, 3TTs and 6 arms.

I really love that bridge armtube, and have wanted to try something similar, ever since I saw <a href="http://www.audioadvancements.com/tonearms/goldengate.gif">this.</a>

Can't wait to hear non-audiophile reactions to it: turntables, tubes, horns, and a very Rube Goldberg looking tonearm.

Your pix have been saved on my HDD for future reference.
  Reply With Quote
Old 30th December 2002, 08:46 PM   #5
diyAudio Member
 
Join Date: Feb 2002
Ladegaard Tonearm: Best Project In DIY Audio.

(Is everyone as bored of hearing me say it as I am of saying it?)



Nice job, livemusic, looks like a cool implementation. I like your VTA setup very much, I had been thinking along those lines myself. Note that coarse VTA can be set with stacks of shims (even coins) under the air bearing if need be, but your way is much nicer.

-j
  Reply With Quote
Old 2nd January 2003, 10:26 PM   #6
diyAudio Member
 
Join Date: Jan 2003
Location: Phoenix AZ
Default Where can I get out?! :)

Nice! Thats the best looking DIY tonearm I've ever seen. What is it made of and how did you build it? As you can read from my other post I'm building my own turntable using the Teres motor and bearing. Wonder what it would take to make this tonearm

*Analog fans may be blind
but digital fans are deaf*
  Reply With Quote
Old 3rd January 2003, 09:37 PM   #7
diyAudio Member
 
Join Date: Aug 2002
Location: israel
Re: StylinLP
Materials used: 3X3 mm red pine beams and 1.5 mm aviation plywood (1 mm also seems enough) for the first arm and the same beams + 1mm balsa wood veneer for the second one. Parts are glued together with yellow carpenter glue. 5-6 layers of polyurethane laquer are applyed in the end. The main design goal is high torsion stiffness at minimum weight. For the balsa arm it is achieved by glueng the inner partitions (placed like framework) to the 2 mm brass tube, going through the arm in the middle of it and also used to lead the wires. BHW, balsa has good gamping properties. The headshell is simple plate of 1 mm brass, glued to the structure beams with epoxy. Anodised aluminium angles used for the lateral elements are bolted and glued together with epoxy. Brass counterweight CG is laying in the the same horizontal plane with the record and vertical pivot axle, and placed as close to the pivot as possible, to minimize vertical effective mass.
Hope this superficial description will help. If you are interested in CAD drawings, e-mail me. BTW, I also intent to use Teres bearing and motor for the further project development.
Cheers,
Michael
  Reply With Quote
Old 6th January 2003, 09:11 AM   #8
peterr is offline peterr  Netherlands
diyAudio Member
 
peterr's Avatar
 
Join Date: Apr 2002
Location: Amsterdam
fantastic looking arm!
I have lingering plans to build a Ladegaard myself someday.
I was wondering though about the need for the armtube to be light, Jeremy Epstein uses (used?) a Denon DL103 with it so I guess his will be rather heavier than yours. What makes you think this is not a good idea?
__________________
Keep an open mind. It helps.
Peter
  Reply With Quote
Old 6th January 2003, 07:35 PM   #9
diyAudio Member
 
Join Date: Aug 2002
Location: israel
Quote:
Originally posted by peterr
fantastic looking arm!
I have lingering plans to build a Ladegaard myself someday.
I was wondering though about the need for the armtube to be light, Jeremy Epstein uses (used?) a Denon DL103 with it so I guess his will be rather heavier than yours. What makes you think this is not a good idea?
Mostly excentric records tracking problem. I noticed the volume level floating with my rather excentric test record, playing lateral modulations track. This was less audible with lighter arm. It seems to me also the lighter arm does match the Shure V15 better.
I intend to measure the actual effective mass for both arms. Would be interesting to learn if the natural resonance frequency is within recommended band.
Cheers
Michael
  Reply With Quote
Old 9th January 2003, 07:47 AM   #10
peterr is offline peterr  Netherlands
diyAudio Member
 
peterr's Avatar
 
Join Date: Apr 2002
Location: Amsterdam
Clicking through the posts I found myself admiring your arm again
A few more questions came up:
What kind of wire did you use?
Is the lower part of the airbearing just loosely resting on the VTA adjustment-screw or is it solidly fixed in some way?
Would it be possible to have some more pictures of the backside and the glider construction?


just curious.
__________________
Keep an open mind. It helps.
Peter
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Linear tracking tonearm vs. Pivoting tonearm Don Nebel Analogue Source 1 4th November 2007 10:49 PM
Airbearing tonearm design (not Ladegaard) koyaanisqatsi Analogue Source 9 27th October 2006 06:51 PM
And The Winner Is............................. Audiofanatic Digital Source 30 25th June 2006 06:24 AM
Ladegaard peterr Analogue Source 57 20th April 2005 02:26 PM


New To Site? Need Help?

All times are GMT. The time now is 02:10 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2