Reed 5T

Reed 5T technically is a tangentially tracking pivoted tonearm. It’s working principle is based on Thales’ theorem (if the center of a triangle’s circumcircle lies on the triangle then the triangle is right, and the center of its circumcircle lies on its hypotenuse) and the rule, that given three non-collinear points, it is possible to draw only one circle that has finite radius and passes through all three. (Fig. 1)

 

Figure 1

 

• P1, O1, P3 – Thales’ semicircle,
• Angles P1-A1-P3, P1-A2-P3, P1-A3-P3 are 90 degrees each,
• Segments A1B1 = A2B2= A3B3 represent length of a tonearm,
• B – Tonearm vertical axis,
• P2 represents a center of circle, drawn through three points – B1,B2 and B3 (tonearm rotation axis),
• P3 – Linear Sensor Array,
• BP3 – Laser beam.

Arm tube suspension system is similar to one used in Reed 2G tonearm, and the tonearm’s turning part is based on low noise thrust-sleeve bearing. For angular rotation of tonearm we designed and built limited rotation sectional torque motor. Tonearm’s position is controlled by laser and linear sensor array.

Reed 5T has user-replaceable arm tube – feature, which allows to change tonearm’s effective mass yourself. Tonearm also has VTA and azimuth adjustments.

Reed 5T has following advantages if compared with pivot tonearms:

• Smaller moment of inertia,
• No need for anti-skating mechanism,
• Max tracking error is +/- 5 Minute of Angle (MOA). (Figure 2). Pivot tonearms usually have max tracking errors up to 1.5 deg.

 

Figure 2

Reed 5T’s advantages compared to other tangential tonearms:

• Few times smaller moment of inertia,
• No need for complicated additional devices (air compressor),
• Compact and sleek design.
• Effective mass in both vertical and horizontal directions is similar

 

SPECIFICATIONS

Mounting distance	251 mm (platter diam.max.= 330 mm)
Tracking error	+/- 5 Minute of Angle (MOA)
Effective mass	8-16 g, depending on armwand material (replaceable armwand)
Height adjustment	compatible with 28÷48 mm height platters
VTA adjustment	precision +/- 0.2 mm
Azimuth adjustment	+/- 8 deg
Downforce range	10÷30 mN (cartridge mass 5.5 g – 19.5 g,(4.0 g – 25,0 g))
Traction	Limited rotation sectional torque linear motor
Voltage	direct 12 V, using battery power source Reed Source 12V

 

SAMPLES OF FINISH

Seashell white                                                                            Gold matte

Black

 

ARMWAND WOOD SAMPLES

Wenge                                                                                             Macassar Ebony

Cocobolo                                                                                           Teak light

 

Teak dark

 

Approximate effective mass of Reed tonearm in grams. Armwand’s effective mass can be adapted to customer’s needs in a range of 8-18 grams.

Armwand Cocobolo 12-18 Makassar ebony 10-14 Wenge 10-14 Teak (dark, light) 8-14