MØRCH DP 8 Dipivot Armtube Tonearm

DP-8

While playing a record, the tonearm must be able to move both horizontally and vertically – horizontally as the cartridge moves towards the center of the record, and vertically to allow for imperfections (warps and bumps) in the record.

At very low frequencies the modulation in the record is only horizontal. If the tonearm can move too freely horizontally the low frequency motion of the stylus will be transferred to the cartridge itself, while the cantilever of the cartridge almost does not move, and thus only a weak signal is induced.

To have excellent audio reproduction at these low frequencies, the horizontal movement of the tonearm must be restricted – but to ensure perfect tracking this must be achieved without a similar restriction of the vertical movement. This “anisotropic” principle – different characteristics for different directions of movement – is the essence of the MØRCH DP-8.

The DP-8 has a flywheel shaped central body and two weights on the sides to stabilize the movement of the tonearm horizontally. Thus, as the cartridge moves towards the center of the record, it can only follow the average location of the groove. It cannot follow the modulation, which is all transferred to the cantilever. This means that all the recorded bass, even the very low end of the range, is reproduced with full amplitude and dynamics.

Model DP-8 has a unique combination of bearings: For the horizontal mode of motion a silicone damped high precision ball-bearing assembly increases the stability provided by the large housing and sideweights. For the vertical mode of motion two precision sapphire bearings are incorporated. (The vertical mode of motion also may be damped. However, it is highly recommended not to do this for model DP-8.)

Model DP-8 has an integrated device for adjusting the VTA while playing. Markings for "getting back" to a special setting is provided.

The feature with different weights of armtubes to optimize the tonearm for any cartridge is maintained. Thus warps will not influence the tracking force, and there will be no vertical deflection of the cantilever.

In model DP-8 the azimuth adjustment for perfect channel separation is accomplished at the pivot of one of the sapphire bearings.

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Standard finish: CHROME.
For GOLD or BLACK finishes, and for extra STANDARD or PRECISION 12", contact us

MØRCH - Finest craftsmanship

MØRCH tonearms are an example of high technical standards and attractive design. In the Hi-Fi world, the MØRCH brand was known as a turntable manufacturer in the 1960s and 1970s. This experience led the brand to experiment with every type of tonearm, achieving the ideal compromise between turntable and tonearm. By adhering to the fundamental requirements for correct design, such as material selection, a new approach to mass distribution, and the elimination of resonances, MØRCH has designed an exceptional tonearm. This research culminated in the invention of a new tonearm concept, now patented.

Specifications

Construction

• Type: Radial arm with interchangeable arm tubes.

Bearing Principle

• DP-6 and DP-8: Dual bearing
• UP-4: Unipivot

Effective Mass of Complete Tonearm with Arm Tube

• Light (green): 4 g
• Medium (red): 6 g
• Heavy (yellow): 8 g
• Extra Heavy (blue): 14 g
• Note: All arm tubes can be used with all models.

Fundamental Resonance (depending on arm tube)

• 8 – 16 Hz (Not applicable for the horizontal mode of motion on DP-8)

Tracking Force (using calibrated scale)

• 0 – 3 g

Bias Compensation

• Watch spring with string – adjustable while playing.

Azimuth

• Adjustable for correct channel separation.

Cueing Mechanism

• Piston in U-pipe, damped with silicone fluid.

Distance Between Pivot and Center of Turntable Platter

• 212 mm (8 5/16″) or 294.1 mm (11 9/16″)

Diameter of Hole for Mounting Arm Base

• 20 mm (13/16″)

Rear Overhang from Pivot

• 70 mm (2 3/4″)

Effective Length

• 230 mm (9 1/16″)

Offset Angle

• 24 degrees

Lateral Tracking Error

• 0 degrees at 66 mm and 120.9 mm from the center of the record.

Pivot Point

• Level with the record surface.

Bearing Friction

• Less than 0.04 mN in all directions.

Balancing

• Four (4) different balancing weights.

Internal Wiring

• 19 strands of ultra pure silver insulated with Teflon.
• Capacitance per Channel: 28 pF for both models.

Tonearm Cord

• Balanced, with extremely purified copper strands heavily silver coated. Halogen-free insulation.
• Moerch Tonearm Connector: Cardas RCA connectors.
• Capacitance per Channel: 100 pF.

Terminals

• All terminals throughout the arm are gold plated.

Bearing Concept

• DP-6 and DP-8: One internally damped, precision ball-bearing assembly for the horizontal plane of motion. Two pivoted sapphire bearings for the vertical mode of motion, which can also be damped and adjusted to different levels of damping.
• UP-4: Hardened steel pivot resting on a concave sapphire, damped for all motions with silicone fluid.

Finish

• DP-6 and DP-8: 24 carat GOLD or CHROME.
• UP-4: CHROME, or GOLD by special order.