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In Reply to: RE: That spec seems odd, no doubt. posted by tketcham on March 28, 2017 at 19:21:36
Hi, Alan,Here's a comparison chart and graph of the differences between the U-Turn Orbit tonearm and the Pro-Ject Debut tonearm. The Pro-Ject 8.6 tonearm has an effective length of 218.5mm (8.6") and typical of Pro-Ject tonearms, is designed with the Lofgren A alignment geometry in mind. I don't know which alignment geometry U-Turn uses for the Orbit tonearm so I included the three most common alignment geometries, Lofgren A (Orbit A), Lofgren B (Orbit B) and Stevenson (Orbit S) for comparison to the Debut tonearm.
Chart and graph from VinylEngine.com's "Tonearm Alignment Calculator Pro".
As you can see, the difference in effective length (pivot-to-spindle + overhang) is only about 7mm (0.3 in), which makes the 7.61" mounting distance that U-Turn quoted you as being quite reasonable.
Regards,
Tom
Edits: 03/29/17Follow Ups:
U-Turn updated their tonearm design late last year. From U-Turn's website:
"We have increased the effective length of the tonearm to allow for the use of Stevenson, Lofgren A (Baerwald) or Lofgren B geometries. Our original tonearm was only compatible with Stevenson. Each type of geometry has its benefits. For example, Lofgren B has the lowest average distortion across the entirety of the record, while Stevenson is best for reducing distortion on the inside of the record. With the new tonearm, we are now using Lofgren A as the default alignment for all Orbits (this is something that you can easily adjust if you prefer an alternative geometry)."
Hope this helps.
Hi, Jon,
Good information. Thanks for the update and link. Haven't heard back from Alan G. so we can probably assume that everything worked out fine.
Regards,
Tom
Thanks for all of the input. I have received a message from U-Turn and according to them the spindle to pivot on the new arm is 193mm with the effective length at 213mm. Does this seem consistent with the measurements you posted up thread? Sorry for all of the newbie questions!
Alan
Hi, Alan,
Here's what you get with the new alignment provided by U-Turn:
The overhang is about 2mm longer than typical 9" tonearms but as long as the headshell accommodates the needed stylus/cartridge overhang and offset angle it appears that U-Turn's revised geometry makes sense.
Enjoy the new turntable and let us know how it sounds.
Regards,
Tom
Thanks for all of the input. I have received a message from U-Turn and according to them the spindle to pivot on the new arm is 193mm with the effective length at 213mm. Does this seem consistent with the measurements you posted up thread? Sorry for all of the newbie questions!
Alan
Wow! Thanks for all of your work. This should really come in handy. I was just hoping there was an arc protractor available for the Orbit. With the latest arm they ship it with the Baerwald geometry. Thanks again!!
I recommend the "TemplateGen" alignment calculator and arc protractor from Conrad Hoffman. The .zip file download is available at the link below. His alignment protractor has been successfully used on a wide range of tonearm/cartridge combinations and there's all kinds of support, including a dedicated discussion thread at VinylEngine.com . It's the one I use for the two Pro-Ject tonearms I own.Tom
PS: If you decide to use Hoffman's TemplateGen protractor, be sure to read the "README.txt" notes. It's full of helpful advice on using the program and protractor.
Edits: 03/29/17 03/29/17
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