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Comparison chart of U-Turn vs Pro-Ject tonearm geometries

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: 03/29/17
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