Audio Database


LUXMAN SQ-38Signature 350,000yen(October, 1995 release)

Tube pre-main stereo amplifier produced commercially in commemoration of the 70th anniversary of foundation.
The title of 38 of the long-term seller covering all the past 7 model is inherited.

The Williamson circuitry is adopted as a power amplifier part.
The inversion signal was formed by little PK splitting of the tone-quality failure, output-tube EL34 (6CA7) was operated by the push pull, and total NFB is limited to a few.
Output-tube EL34 has selected carefully and adopted the thing of Golden Dragon specially produced with the line. Furthermore, "12AU7" is used for the first rank. It is the orthodox element and circuitry of using "2B H7" for the driver stage.

OY type of the tradition which determined the validation of the Lux as a transformer manufacture is adopted as the output transformer which has great influence on a tone quality.
Orient core material is used, it unites with a specification based on a splitting volume original with OY, and the new design is performed. In addition to the outstanding tone quality with little phase rotation, this has gained low-pass and the gentle response extended to the full audio frequency band.
Moreover, leakage flux is completely eliminated because the main unit of a transformer gives filling by fixed material on a severe shielding and also dedicates it to iron cases.

The custom-made volume control which has improved distortion in the Puri part and aimed at the improvement in a tone quality on Hearing impression is carried.
As for the tone control circuit, 12 AU of thermionic tubes consist of 7. The more natural correction by making upper register and a bass region become independent is possible in this circuitry.

A prejudice is put into practice also among a basic part, and the compound electrolytic capacitor, the highly precise mold resistor, and the circuit board which were newly improved are filled with consideration of a tone quality, such as using the double-sided type made from glass epoxy.

The source selection can change a line input and a tapes input/output independently.
Moreover, if 3 head deck is used, the simultaneous monitor at the time of a sound recording can also be performed with a monitor switchpoint.
Furthermore, it is also possible to jump over a monitor switchpoint and a balance volume and to send the signal of the source in the purer status with a line straight switchpoint.

In order to correspond to compact disk, DAT, etc., four line inputs are carried.
Moreover, the highly precise phone equalizer is also built in.

While certainly fixing the thermionic tube, in order to eliminate the influence of an oscillation from the outside, moderate weight was given to the chassis and the rigid high structure is completed.
Furthermore, a high-density material is used for a side panel, and consideration is made by the measure against a vibration suppression, such as constituting from a material in which the oscillation modes differ.
Moreover, the knob of volume control or a multiple contact switch is what combined blast finish and a hairline manipulation.

AC inlet is adopted as a power cable.
Moreover, a polar mandatory can also be performed now by adoption of a line phase sensor.

Upper Rear
Thermionic-tube OY

Rating of a mode
Form Tube pre-main stereo amplifier
Input sensitivity/impedance Line1:150mV/47kohm
compact-disk: 150mV/47kohm
Phono man month: 2.5mV/47kohm
Tape Monitor: 150mV/47kohm
Effective output 30W+30W (6ohms)
THD 0.5% (6 ohms, 1 kH/NFB6dB)
Frequency characteristic 20Hz - 20000Hz, and +0 -0.5 dB
Tone control ±15dB (the maximum variation)
Attachment Line straight switchpoint
Monitor switch
REC OUT switchpoint
Tone control (Bass/Treble)
AC inlet
Phone equalizer (man month)
Supply voltage AC100V, 50Hz/60Hz
Power consumption 190W (based on a convention of Electrical Appliance and Material Control Law)
Dimension Width 430x height 209x depth of 387mm
Weight 22.0kg