Technics SL-1200 overhang, offset, and null radii.
Technics prints 230 mm effective length and 15 mm overhang for the SL-1200G, the SL-1200GR and SL-1210GR, the SL-1200MK7, and the SL-1500C. Effective length is pivot-to-spindle plus overhang, so the mounting distance on this page is 230 minus 15, which is 215 mm. The table then solves Baerwald, Lofgren B, and Stevenson for that distance. It does not reprint the factory alignment as if it were Baerwald.
Published mounting distance: 215 mm.
Technics does not print the phrase pivot-to-spindle. It prints effective length and overhang. This page uses 215 mm because 230 minus 15 is 215.
Factory alignment published by Technics for these models: 15 mm overhang and 22 degrees offset. That pair is the factory setup, not the Baerwald column.
- Pivot to spindle
- 215.0 mm
- Effective length
- 230.0 mm
- Factory overhang
- 15.0 mm
- Factory offset
- 22.00 deg
Baerwald, Lofgren B, and Stevenson.
The studio clamps this distance to 150 mm through 400 mm. Null radii stay on the IEC groove. Overhang, offset, and effective length follow the distance.
| Curve | Overhang | Offset | Inner null | Outer null | Effective length |
|---|---|---|---|---|---|
| Baerwald (IEC) | 17.82 mm | 23.66 deg | 66.00 mm | 120.89 mm | 232.82 mm |
| Lofgren B | 18.19 mm | 23.55 deg | 70.16 mm | 116.19 mm | 233.19 mm |
| Stevenson | 15.89 mm | 22.64 deg | 60.33 mm | 117.42 mm | 230.89 mm |
Sources
- Technics SL-1200G specifications (effective length 230 mm, overhang 15 mm, offset 22 degrees)
- Technics SL-1200GR specifications (effective length 230 mm, overhang 15 mm, offset 22 degrees)
- Technics SL-1200MK7 specifications (effective length 230 mm, overhang 15 mm, offset 22 degrees)
- Technics SL-1500C specifications (same 230 mm effective length and 15 mm overhang)
Questions about this arm
Why does this page use 215 mm when Technics prints 230 mm and 15 mm?
Technics publishes an effective length of 230 mm and an overhang of 15 mm for the SL-1200G, the SL-1200GR and SL-1210GR, the SL-1200MK7, and the SL-1500C. Effective length is the pivot-to-spindle distance plus overhang. 230 minus 15 is 215 mm. The StrobeHz iOS geometry preset uses that same 215 mm. Older SL-1200 generations are not listed here unless you confirm their own sheet prints the same pair; the field below will recompute if you enter a different published distance.
Why is the Baerwald overhang not 15 mm?
15 mm and 22 degrees are the Technics factory alignment for this arm. Baerwald, Lofgren B, and Stevenson are different targets on the same 215 mm mounting distance. The table is those three curves. It does not rename the factory 15 mm as Baerwald.
Will the null radii move if I type a different pivot distance?
No. Null radii come from the IEC 60098 inner groove at 60.325 mm and the outer groove at 146.05 mm, which are the radii StrobeHz uses. With those radii the table reads 66.00 mm and 120.89 mm for Baerwald, 70.16 mm and 116.19 mm for Lofgren B, and 60.33 mm and 117.42 mm for Stevenson. Overhang, effective length, and offset angle are the quantities that move when the pivot distance changes.