Audio Database
No28L
Commentary

A control amplifier that uses a simple front face that eliminates only the minimum necessary functions.

The No28L consists of the main body (No28L) and power supply (PLS-228L).

Focusing on the problem of sound quality degradation that occurs during music processing, we have adopted a unique technology called DIDO (Differential in Differential out) to put an end to the long-standing problem. This method of balanced signal processing from input to output reduces common-mode noise and distortion as much as possible.
To make full use of DIDO technology, it is equipped with balanced input / output that is resistant to external noise.

Equipped with a newly developed attenuator using an optical readout method, it ensures high reliability without being affected by mechanical friction or temperature change while enabling precision operation within 0.1 dB.

The technology of the high-end model No26L has been passed on to each part. It uses a unique matrix high-precision relay control that minimizes the path of the music signal and limits the switch contact between input and output to a maximum of two places. It also uses an independent power supply composed of the same high-grade parts used for the power supply PLS-226L of the No26L.

In addition to the standard model, there were models with MM phono card and models with MC phono card.

Model Rating
Type Control amplifier
Gain Phono amplifier MM : 38 dB, 44 dB
Phono amplifier MC : 58 dB, 64 dB
Line Amp Unbalanced : 0 db, 6 db, 12 db, 18 db
Line Amp Balanced : 6 db, 12 db, 18 db, 24 db
Input impedance MM : 47k Ω (Changeable)
MC : 825 Ω (changeable)
Line amplifier : 15k Ω
Output impedance 10 Ω
Pwer 100 VAC, 50Hz/60Hz
External dimensions Body : Width 444.5x Height 78.5x Depth 276.5 mm
Power Supply : 217.1 mm W x 78.5 mm H x 333.4 mm D
Weight Body : 6.5 kg
Power supply : 6.0 kg