Audio Database


This tube type line control amplifier was developed to support SACD and DVD audio with the proposition of "reproducing digital source in rich and dense".

The power supply section uses a strict CR filter to completely eliminate hum and noise contamination.
In addition, in order to become an ideal power supply, the most suitable configuration is realized by positively adopting semiconductors.

In order to further improve the S/N ratio of the power supply circuit and amplifier circuit, only a part of the printed circuit board is used, and manual wiring is used so that the signal flows smoothly into the vacuum tube.

The flat amplifier circuit (line amplifier) is a 2-stage NF system driven with low impedance.
The output stage employs an SRPP (Shunt-Regulated Push-Pull) circuit with excellent output characteristics, high input impedance, low output impedance, and excellent low-distortion characteristics, thereby realizing stable operation over a wide band and low distortion factor.

Selected tubes of 12AX7 (ECC83) for the first stage and 12stage and 12AU7 (ECC82) for the second stage.

We use carefully selected parts such as polypropylene capacitors made in the United States, copper wires with a purity of 99.9999% (6-9 level) and Berden's wiring materials.
We also use parts that have been carefully selected through long-term listening and endurance tests, such as a detent volume, metal coating resistance, and high-quality low-noise carbon resistance.

A chassis with high rigidity is used to suppress unnecessary vibration.

There was an optional premium volume version.

Model Rating
Type Tube line control amplifier
Output voltage 2 v (Rated), 15 v (Maximum)
Output impedance 300 Ω
Total harmonic distortion factor 0.01% or less
Frequency characteristic 5 Hz to 100 kHz ± 1 dB
Input sensitivity 110 mv (Output 1 v)
Signal-to-noise ratio (IHF-A corrected) Up to 90 dB
Vacuum tube used 12AX7/ECC83x1
External dimensions Width 430x Height 90x Depth 325 mm
Weight Approx. 8 kg