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Old 12th November 2016, 09:27 AM   #1031
walterwalter is offline walterwalter  Ukraine
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Default Linear arms and photoelectric cartridges

The sound of most analog systems aren't that noticeable when you play the first track of the record. They usually sound decent. It is always the last track that tracking error rears its ugly head and becomes most audibly noticeable. Sometimes the distortion is painfully intolerable to me.[/QUOTE]

Directdriver, in your opinion, is it a result of angular error, or maybe of slower linear speed on last tracks of LP? In last case, linear arm will not bring much of sound improvement.
As for starting a new topic, I haven't decided yet, if dedicate it to photoelectric carts only, or maybe to much wider theme of old promising designs in analog audio, those not manufactured on large scale.

Last edited by walterwalter; 12th November 2016 at 09:30 AM.
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Old 12th November 2016, 06:02 PM   #1032
directdriver is offline directdriver  United States
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I meant to say tracking distortion or whatever audible distortion is more noticeable on the inner grooves and this topic has been discussed in other threads and posts here and elsewhere.

Here's an example of the kind of distortion that grates on my nerves, particularly at the chorus at 3:41. Maybe that's in the pressing. I don't know. That kind of distortion depresses me when you consider the expense in putting up an analog system like that.
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Old 21st December 2016, 07:54 PM   #1033
directdriver is offline directdriver  United States
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Default KLAudio

Some interesting pictures on this curious Klaudio tonearm found from another forum.

You should also check out this video and this video.


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Old 30th January 2017, 05:25 AM   #1034
super10018 is offline super10018  United States
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I saw someone posted these photos on Facebook. The latest arm 5T from Reed Audio.
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Old 30th January 2017, 08:19 AM   #1035
Subaru is offline Subaru  South Africa
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So ... I got lucky this XMAS .... a good audio friend gifted me a transfi arm with tomahawk wand as well...

It was a learning curve trying to set it up .... but once I had it going it was clearly very different...

So my beloved Alphason HR100s and 12" Jelco 750LB went to good homes..


I just have a few questions for those in the know ...
can one use the Feickert adjust plus on these tangential arms as well ... ? I had good success with the Jelco using the adjust +...

Also , and please correct me if perhaps I 'm wrong here... I suspect that this arm gives do much more detail that find if my older records are really sounding more like they look ... and I have a lot of those....
the thing I noticed is that I was enjoying the ZYX R100 so much( perhaps cause it's big do analytical....) that I struggled to choose between it and my DV XX2 MK 2... and I suspect cause the DV was giving a bit too much details ( which included the age imperfections on a lot of my favourite LP's)..... anyway I have not finished setting up the DV to my liking as yet.... hence the adjust + question ... but already this is a winner over the other arms I had...( even Graham phantom B44 did not survive the Alphason ...)...
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Old 30th January 2017, 02:32 PM   #1036
sikisa is offline sikisa
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My headshell angle 90
https://drive.google.com/file/d/0BxE...ew?usp=sharing

https://drive.google.com/file/d/0BxE...ew?usp=sharing

https://drive.google.com/file/d/0BxE...ew?usp=sharing

Last edited by sikisa; 30th January 2017 at 02:43 PM.
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Old 30th January 2017, 04:47 PM   #1037
Subaru is offline Subaru  South Africa
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Default Angling for 90 - tangential pivot tonearms

Oh ... some initial cellphone pics .. Click the image to open in full size.



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Last edited by Subaru; 30th January 2017 at 04:49 PM.
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Old 30th January 2017, 10:52 PM   #1038
directdriver is offline directdriver  United States
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Default Birch rebirth

Quote:
Originally Posted by super10018 View Post
I saw someone posted these photos on Facebook. The latest arm 5T from Reed Audio.
Thanks Jim for alerting me to this creation!

It appears to me this is a motorized servo version of the Birch geometry. The original Birch was a passive tonearm, similar to the Schroeder LT but the Reed 5T is active using the laser above the pivot arm pointing back to the sensor and locus of the Thales geometry. Instead of the assembly travelling the record playing surface in a straight line of 4", the motorized part rotates only couple inches. Very clever. As the arm travels closer to the spindle the motorized part rotates towards the spindle as well which is virtually extending the length of the arm from the locus to the stylus tip.

A forum member, Esperado, from before had designed something like this decades ago but the sensor was placed at the spindle area. While this thread is mostly about the passive genre, I am glad someone is taking on a non-parallel tracking approach!

Ergonomically, it appears to be easy to use too, as the pivot arm is detachable for easy cartridge swap. I would prefer the base to be more compact so it's more compatible with turntables with smaller footprint. But for servo tonearm, I would happily take this over the over-engineered Derenville tonearm.

This type of project was suggested theoretically by me and others by making a motorized armpod or island for traditional pivot tonearms. Here, the Reed design team materialized it. Bravo!

Some more pictures from another site.
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Reed geometry
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Birch geometry
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Old 31st January 2017, 03:07 AM   #1039
super10018 is offline super10018  United States
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It seems to me that it is not very difficult to implement an active Birch geometry tangential pivot arm. 1. To use a small stepper motor at point P. 2. To use a motor speed controller or use an Arduino controller. 3. To add a stop sensor. 4. To build a pivot arm and place it on the moving circular plate. 5. To use a strong magnet at point B to guide the arm wand.

Last edited by super10018; 31st January 2017 at 03:21 AM.
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Old 31st January 2017, 04:50 AM   #1040
directdriver is offline directdriver  United States
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Quote:
Originally Posted by super10018 View Post
It seems to me that it is not very difficult to implement an active Birch geometry tangential pivot arm. 1. To use a small stepper motor at point P. 2. To use a motor speed controller or use an Arduino controller. 3. To add a stop sensor. 4. To build a pivot arm and place it on the moving circular plate. 5. To use a strong magnet at point B to guide the arm wand.
All valid points, except #5 because the sensor is already at point B, there's no need for further guiding mechanism or magnet. Member Dough Tuthill (aka "dtut") did use magnet in post #765 for his DIY arm because it was a passive arm. He also used heimjoint as guiding mechanism in post #758.

I'm just curious how the Reed 5T arm deals with eccentric records. I assume it's similar to Rabco/Goldmund going only one direction to the spindle and not over correcting it. The servo arm on the Pioneer PL-L1000 can slide both directions which is not a good idea.
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