DIY parallel tracker air arm - another one - 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 22nd December 2009, 10:54 PM   #1
diyAudio Member
 
Speedysteve7's Avatar
 
Join Date: Dec 2009
Location: Hants/Berkshire/Surrey
Default DIY parallel tracker air arm - another one

It started out as MkI as proof of concept.

Click the image to open in full size.

Click the image to open in full size.

it did work reliably but did not sound too brilliant - not surprising really.

Then I got a Terminator home and was using it and thought - naaa I could make one of those.

Here's my Terminator copy. Spent some time making this out of the right materials and it sounded as good as a borrowed Terminator arm I tried.

Here it is early on with a headshell made out of a door bolt

Click the image to open in full size.

Then some more work on a headshell from billet aluminium

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

I even put it on my PL-71 - sounded good but looks kind of wrong IMO

Click the image to open in full size.

It was a fun project but I use the PL-71 arm and mat on a modded Technics SL-1210 deck as my normal use set-up. I just love that arm and that decks locked on precision...
  Reply With Quote
Old 23rd December 2009, 12:56 PM   #2
marekst is offline marekst  Poland
diyAudio Member
 
marekst's Avatar
 
Join Date: Oct 2006
Location: Central Florida
Great work, congrats!
I always admired this kind of tonearms, but my room is so quiet I can hear silverfish fornicating in the records’ sleeves so the slightest hiss would drive me nuts.
Marek
  Reply With Quote
Old 23rd December 2009, 01:07 PM   #3
diyAudio Member
 
Holger Barske's Avatar
 
Join Date: Jan 2001
Location: Ruhrgebiet
Very nice work!
I sometimes wonder why we do not see more Ladergaard tonearms around, the concept is simple and works really well.
One thing about your headshell: It seems to be really heavy, and this will result in high effective mass. You will have to mount a really stiff cartridge.
__________________
Best regards: Holger
www.holgerbarske.com - Deutschsprachiges Paradise-Support-Forum
  Reply With Quote
Old 23rd December 2009, 02:02 PM   #4
diyAudio Member
 
Speedysteve7's Avatar
 
Join Date: Dec 2009
Location: Hants/Berkshire/Surrey
Quote:
Originally Posted by marekst View Post
Great work, congrats!
I always admired this kind of tonearms, but my room is so quiet I can hear silverfish fornicating in the recordsí sleeves so the slightest hiss would drive me nuts.
Marek
The hiss is pretty quiet. I had more problems with the fish tank air pump.
Even in the cupboard under the stairs (adjacent to the lounge) it disturbed me.

I build a 18mm thick MDF box with foam and carpet tile lining and 5 6mm drill holes for air in - that shut it up completely.
  Reply With Quote
Old 23rd December 2009, 02:06 PM   #5
diyAudio Member
 
Speedysteve7's Avatar
 
Join Date: Dec 2009
Location: Hants/Berkshire/Surrey
Quote:
Originally Posted by Holger Barske View Post
Very nice work!
I sometimes wonder why we do not see more Ladergaard tonearms around, the concept is simple and works really well.
Once set up it stayed in trim very well.

One thing about your headshell: It seems to be really heavy, and this will result in high effective mass. You will have to mount a really stiff cartridge.
it does work well - easy to see where you are in a record from the chair too!

The headshell is pretty small really.
The Terminator shell has two large screw in brass grubs to allow massing up for lower compliance carts and an extra counter weight.

I only used my arm on the AT 33 PTG which is med to high compliance and it worked fine. With the SPU Royal N I now have I would need to mass up both the headshell and counter weight and the carriage. As you can see from some of the pics I have an extra bit of ali angle on top - that improved the bass.
Something to play around with to get right.

Last edited by Speedysteve7; 23rd December 2009 at 02:11 PM.
  Reply With Quote
Old 24th December 2009, 10:53 AM   #6
diyAudio Member
 
Join Date: Aug 2002
Location: israel
Default Air hiss

"...slightest hiss would drive me nuts"

Audible pump noise and air hiss is the only one part of the problem (more or less manageable). Do a simple test with your air tracker:
1. Lower the cart on static (non-rotating) record,
2. Turn the pump off.
3. Crank your pre-amp all the way up (let's ignore electronic hum and buzz).
4. Swith on the pump.
What do you hear?
The air flow couples considerable noise source straight to the arm slider, degrading weak signal, even if the hiss itself is non-audible.
This is one of the major drawbacks of Ladegaard design.
  Reply With Quote
Old 24th December 2009, 04:31 PM   #7
Geosto is offline Geosto  Netherlands
diyAudio Member
 
Join Date: Jan 2009
Hi Speedsteve7,

That is a very nice Terminator style tonearm.
Can you post some pics from your air supply?
I have Build myself a Terminator style arm bud i still have trouble make the air supply quiet.
Now it is in a room next to my listening room.
Here you can see mine creation Newbie DIY tonearm question

Regards George
  Reply With Quote
Old 27th December 2009, 12:22 PM   #8
diyAudio Member
 
Speedysteve7's Avatar
 
Join Date: Dec 2009
Location: Hants/Berkshire/Surrey
Quote:
Originally Posted by Geosto View Post
Hi Speedsteve7,

That is a very nice Terminator style tonearm.
Can you post some pics from your air supply?
I have Build myself a Terminator style arm bud i still have trouble make the air supply quiet.
Now it is in a room next to my listening room.
Here you can see mine creation Newbie DIY tonearm question

Regards George
Hi,
Been away a few days - These are pics taken from the cupboard under the stairs. I forgot I even put the box on Foculpod feet but an felt or wadding would do.

Click the image to open in full size.
Click the image to open in full size.

The box is jsut 18mm MDF lined with 10 or 15mm sheet foam and then that is lined with carpet tiles cut to fit (carpet side facing inwards).

The pump is here

Click the image to open in full size.

How poeple with fish tanks would put up with something like this in their living room (or any other room) is beyond me - says Quiet operation on the box - yeah right!

Anyway the box completely shuts it up - you strain to here it in the confined space of the cupboard - no way it would disturb the music or between tracks if I mounted it behind the hifi.

Forgot to say George; that is a very nicely made arm. I'd have to do some polishing to catch up there.
Mine is made of B&Q (hardware store) building brackets - no nice solid riser like yours.
You have mounted it very far forward. On my SL-1210 I have a Rega arm board adapter. On the Pioneer it is farther forward and sounds better for it.
The shorter the wand the better I think.

I used a carbon fibre Kite spar/rod for the wand.

I have not considered putting the SPU Royal N on my air arm yet - would need to mass up the headshell and the counterweight too (easy enough). The carriage - just add ali angle strips till it sounds best. I would make another arm board (trust 1/2" ply) I think to get the wand shorter too.

Have days spare now - might try it all and see how it sounds.

Last edited by Speedysteve7; 27th December 2009 at 12:36 PM. Reason: Added compliment on George's work and future project.
  Reply With Quote
Old 28th December 2009, 07:22 PM   #9
Geosto is offline Geosto  Netherlands
diyAudio Member
 
Join Date: Jan 2009
Hi Speedysteve7,

Thanks for the pic's.
I think i would make a box to.
The noise in the room were the pump is located is now is not pleasant.

I use a carbon fiber wand also bud the head shell comes from an old AKAI turntable.
If you are making a new wand you may try this to.
Because of the weight from the tonearm wires the pressure on the tip of the needle was not stable.
I did solve that by drilling a hole behind the hinge.
Click the image to open in full size.

Regards George
  Reply With Quote
Old 28th December 2009, 07:36 PM   #10
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Regarding air noise
It helps to have a small "buffer" airbox, filled with light acoustic material, like a muffler on a car
Also gives a more smooth airflow
One major problem is to get all connections 100% airtight, not to loose pressure
  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
DIY Air bearing tangent tone arm neil_kaye Analogue Source 160 12th October 2013 04:20 AM
YAABA - yet another air bearing arm woodturner-fran Analogue Source 1 10th March 2009 12:24 AM
Ladegaard Arm Air Requirements ? valveitude Analogue Source 10 1st February 2007 09:06 AM
MG-1 AIR BEARING Tangential Arm audio-kraut Analogue Source 7 24th November 2004 08:55 PM
Shielding for diy arm wiring when DIY arm itselve cannot not provide it? hybris Analogue Source 12 31st October 2003 12:20 PM


New To Site? Need Help?

All times are GMT. The time now is 05:53 AM.


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