Audio Database

The

MARK LEVINSON No28L 780,000yen(1991 release)
850,000yen(man-month phone card equipment, 1991 release)
850,000yen(MC phone card equipment, 1991 release)

Description
 
Control amplifier which adopted the simple front face which eliminated only the necessary minimum functionality.

No28L consists of a main-unit part (No28L) and a power-source part (PLS-228L).

Paying attention to the problem of a tone-quality failure which arises by a musical processing process, the original technology of DIDO (Differential in Differential out) is adopted in order to put a period to years of task. With this scheme that carries out the signal processing of all with a balanced type from an input to an output, common mode noise and a distorted descendant are suppressed as much as possible.
Moreover, in order to employ a DIDO technology efficiently, the balanced type input/output strong against an exogenous noise is carried.

The newly developed Attenuator by an optical reading scheme is carried, and the hi-reliability influenced by neither a mechanical friction nor the temperature change is secured, enabling a precision operation of less than 0.1dB.

The technology of No26L which is a high-end model is inherited to each part, and the path of a music signal is made into the shortest,The independent source which consisted of same high-grade parts as what uses the switchpoint electric contact point during an input/output for the original matrix highly precise relay control suppressed to a maximum of two places and power-source part PLS-226of No26L L is adopted.

There were man-month phone card loading model and MC phone card loading model other than a standard model.

Internal
The

Rating of a mode
Form Control amplifier
Gain Phone amplifier man month: 38dB, 44dB
Phone amplifier MC: 58dB, 64dB
Line amplifier Unbalanced: 0dB, 6dB, 12dB, 18dB
Line amplifier Balanced: 6dB, 12dB, 18dB, 24dB
Input impedance man-month: 47kohm (a modification is possible)
MC: 825ohms (a modification is possible)
Line amplifier: 15kohm
Output load impedance 10ohms
Power source AC100V, 50Hz/60Hz
Dimensions Main unit: Width 444.5x height 78.5x depth of 276.5mm
Power source: Width 217.1x height 78.5x depth of 333.4mm
Weight Main unit: 6.5kg
Power source: 6.0kg