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RE: Mounting Distance For U-Turn Orbit With "9 Arm

Posted by John Elison (A) on March 28, 2017 at 19:59:57

In Reply to: RE: Mounting Distance For U-Turn Orbit With "9 Arm posted by AGolski on March 28, 2017 at 18:49:37:

The U-Turn tonearm is probably shorter than 9-inches. In other words, 9-inches is just a general length designation. All tonearms in-between 8.4" and 9.5" are called 9-inch tonearms. For example, my SME V is called a 9-inch tonearm but its effective length is actually 233.15-mm or 9.179-inches. Rega tonearms are also called 9-inch tonearms but have effective length of 9.33-inches. Therefore, perhaps the U-Turn tonearm has effective length of 8.4-inches, which would make it reasonable to have a mounting distance of 7.61-inches.

If you want to understand U-Turn Orbit tonearm geometry, you need to ask them for at least three independent alignment parameters such as effective length, mounting distance and offset angle. Or, ask them to provide mounting distance along with both alignment null-points. As long as you have any three independent alignment parameters, you can figure out all the other parameters using the tonearm geometry equations provided below:

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Edits: 04/15/17

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