Technics Baerwald protractor - Technics SL1210 mk5 - Problems?

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Jools45
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Technics Baerwald protractor - Technics SL1210 mk5 - Problems?

Post by Jools45 » 11 Aug 2019 17:07

Has anyone else had problems using the Technics Baerwald protractor (downloaded from this site) ?

The turntables I am setting up are Technics SL1210 MK5 (I have 2 of them). I am also using the original Technics hesdshells.

I have downloaded the Technics protractor twice. Both times I have measured the horizontal and vertical calibration lines to make sure my print-out was 100% accurate and to scale.
Try as I might, I just can't get the stylus tip to reach the inner cross?
Once the arm is in its inner most position (up against the stop) the stylus tip is still a good 5mm away from the cross (inner reference point).
I wondered if my tonearm was slightly bent so I tried again on my second turntable, with exactly the same results?
Then I wondered if I was doing something wrong, so I tried with an Ortofon Concorde. I figured the the none adjustable factory configuration of the Concorde must be set up correctly. However it's just the same? (when the arm is moved to its more inner position the stylish tip is still around 5mm away from the inner X.

I find if I use my overhang guage with the cartridge square in the headshell and the stylus pointing to the 'v' groove on the end of the gauge, this method is just about in perfect sync with the Stevenson protractor (also downloaded from here).

I have no problem using the overhang guage or the Stevenson system, however I presumed the 'dedicated' Technics protractor would be the way to go for more accurate results?

Jools

JaS
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Re: Technics Baerwald protractor - Technics SL1210 mk5 - Problems?

Post by JaS » 11 Aug 2019 18:06

The stylus doesn't need to reach the inner cross C. You just need to adjust the overhang so that the stylus follows the arc, then adjust the angle of the cartridge in the headshell so that the cartridge is square with the grid lines when the stylus is placed at the center of the grid.

FWIW being a Baerwald design it uses different alignment to a Technics overhang gauge, requiring more overhang for slightly lower peak distortion. In practice either should give good results.

Jools45
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Re: Technics Baerwald protractor - Technics SL1210 mk5 - Problems?

Post by Jools45 » 11 Aug 2019 19:53

Thank you so much for your reply.
It really had me stumped why I couldn't get to the inner reference point.
I think I'll stick to the manufacturer settings using the overhang gauge (which is the same as the Stevenson protractor). To be honest my main priority is minimal record wear (as apposed to limiting distortion)... My ears aren't as keen as they use to be)..

chiz
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Re: Technics Baerwald protractor - Technics SL1210 mk5 - Problems?

Post by chiz » 14 Aug 2019 13:08

Jools45 wrote:
11 Aug 2019 19:53
I think I'll stick to the manufacturer settings using the overhang gauge (which is the same as the Stevenson protractor).
The manufacturer’s settings are not exactly the same as Stevenson when calculated with conventional inner / outer radius.

If you want an arc protractor that replicates the Technics spec you can download one here:
http://www.jkwynn.co.uk/Pics/Technics%2 ... ractor.pdf

Or you can create a custom arc protractor using the Conrad Hoffman tool and these settings:
http://www.conradhoffman.com/TemplateGen.zip
CH_Technics.JPG
(47.35 KiB) Downloaded 39 times
Comparison here:
https://www.vinylengine.com/tonearm_ali ... =calculate

Jools45
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Re: Technics Baerwald protractor - Technics SL1210 mk5 - Problems?

Post by Jools45 » 14 Aug 2019 16:11

chiz wrote:
14 Aug 2019 13:08
Jools45 wrote:
11 Aug 2019 19:53
I think I'll stick to the manufacturer settings using the overhang gauge (which is the same as the Stevenson protractor).
The manufacturer’s settings are not exactly the same as Stevenson when calculated with conventional inner / outer radius.

If you want an arc protractor that replicates the Technics spec you can download one here:
http://www.jkwynn.co.uk/Pics/Technics%2 ... ractor.pdf

Or you can create a custom arc protractor using the Conrad Hoffman tool and these settings:
http://www.conradhoffman.com/TemplateGen.zip
CH_Technics.JPG

Comparison here:
https://www.vinylengine.com/tonearm_ali ... =calculate
Thanks so much for all the info Chiz,
This will come in very useful, and it's very much appreciated.
I'll print the protractors when I'm on my computer.
All the best
Jools

chiz
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Re: Technics Baerwald protractor - Technics SL1210 mk5 - Problems?

Post by chiz » 14 Aug 2019 18:28

You're welcome Jools, happy I could help.

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