Improving on perfection

The Ortofon MC A95, a world-class moving coil cartridge was launched to commemorate the 95th anniversary of Ortofon’s technical leadership in the audio industry.

STYLUS RAKE ANGLE (SRA)

With a complex stylus shape like the Replicant 100, there must be special attention paid to positioning the diamond in the groove. The Stylus Rake Angle (SRA - see figure) is very important to the performance of the Replicant 100 stylus, and the long contact surface (the sharp edge) of the diamond should be almost perpendicular to the record surface when viewed from the side. The angle between the record surface and the cantilever is close to 23 degrees when the SRA is 90 degrees. A perfect starting point is to set the tonearm parallel to the record surface and to use the recommended tracking force. The contact surface will be close to perpendicular to the record surface with this setting. The SRA can now gradually and carefully be changed be adjusting VTF and, if necessary, the tonearm height. The target should be an SRA around 92 degrees, determined by the listening experience. In other words, the point of the stylus should point slightly toward the tonearm base.

Azimuth

In order to attain maximum channel separation, it may be possible to adjust the azimuth. Should the cartridge not be perfectly perpendicular to the record’s surface, the tonearm or headshell may require to be tilted a few degrees.

Correct azimuth is established by observing the reflected image of the 2 parallel cartridge front lines. The cartridge’s front lines must form a straight line with the reflected lines. A flat mirror may also be used to facilitate this process.

Mounting

There are 4 sets of screws included for mounting the cartridge to your tonearm. It is of great importance to choose the correct length of screws when mounting the cartridge. Using too long screws may stop the screws inside the cartridge resulting in insufficient mounting in the headshell. The choice of screw length depends on the thickness of the headshell and a maximum of 2.5 mm free screw length under the headshell. Mount the cartridge loosely to the headshell during this procedure.

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The Ortofon MC A95 Technical data

Output voltage at 1000 Hz, 5cm/sec. - 0.2 mV
Channel balance at 1 kHz  -  < 0.5 dB
Channel separation at 1 kHz  -  > 25 dB
Channel separation at 15 kHz  -  > 22 dB
Frequency range at - 3dB  -  10 Hz - 50 kHz
Frequency response  -  20 Hz-20 kHz +2 dB/- 1 dB
Tracking ability at 315Hz at recommended tracking force  -  90 µm
Compliance, dynamic, lateral  -  13 µm/mN
Stylus type  -  Special polished Nude Ortofon Replicant 100 on Boron Cantilever
Stylus tip radius  -  r/R 5/100 µm

Tracking force range  -  2.0-2.5 g (20-25 mN)
Tracking force, recommended  -  2.3 g (23 mN)
Tracking angle  -  23°
Internal impedance, DC resistance  -  7 Ohm
Recommended load impedance  -   > 10 Ohm
Coil wire material  -  Aucurum
Cartridge body material  -  SLM Titanium
Cartridge colour  -  Silver
Cartridge weight  -  6 gram