Luxman SQ38FD Stereo putkivahvistin

Erittäin hyvässä kunnossa laatuvahvistin. Japanilainen versio 100V.

Laadukas muuntaja mukaan. Huolto tehty tammikuussa 2024.

Commentary

This is a bulb-type pre-main amplifier that is the fourth generation of the SQ38 series.

50CA10 is used for the output tube, and OY15 type is used for the output transformer.

The main amplifier section is based on a Mulard type circuit. In order to make the best use of the features of this circuit, the distortion characteristics in the high-frequency range are improved by improving the details. Furthermore, by inserting a phase correction circuit, the instability of the amplifier caused by the attenuation of the load in the high-frequency range where the impedance of the speaker increases is eliminated.

The 2-stage NF-type equalizer and LUX NF-type tone control are used in the preamplifier section.

The left and right sides of the tone control are independent, and the bending point can be switched by two points for both low and high frequencies.

Equipped with a high filter or low filter.

Equipped with the input level setting function of the main amplifier section.

There are two speaker outputs.

Since the output impedance of the speakers can be selected for each system, the optimum load can be selected even when speakers with different impedances are connected.

Model Rating

Type Tube type pre-main amplifier

Continuous effective output 30W + 30W (4 , 8 , 16 )

Total harmonic distortion factor 0.7% or less (at maximum output)

Frequency characteristic 20 Hz to 20 kHz -1dB

Input sensitivity Phono1/2:2.2mV

Aux1/2/3:200mV

Monitor:200mV

Input impedance Phono1/2 : 50k

Aux1/2/3 : 200k

Monitor:200mV

Signal-to-noise ratio Phono : 60 dB or more

Aux : 70 dB or more

Monitor : 70 dB or higher

Equalizer RIAA (deviation within ± 0.5 dB)

Crosstalk Channel to channel : 57 dB or more

Between aux and phono : 55 dB or more

65 dB or more between Aux and Aux

Damping factor Approximately 15 (1 kHz)

Residual noise 1 mV or less

Recording output 200mV/2k

Pre-part output 1V/1k

Tone control LUX System NF Type with Bending Point Frequency Switching

High-frequency curve point : 3 kHz, 6 kHz

Low-range bending point : 300 Hz, 150 Hz

Possible to be defeated

High-cut filter 5 kHz, 9 kHz

Low-cut filter 100 Hz, 50 Hz

Attachment MAIN section input level set

Tape monitor switch and terminal

DIN standard tape connector

Used vacuum tubes, etc.

Vacuum tube :

Diode : 50CA10x4 Pieces

6DT8/6AQ8x2 pieces

6267x2 Pieces

12AX7x4 Pieces

DS16Ax4 pcs

4 DS16Cxs

Pwer 100 VAC, 50Hz/60Hz

Power consumption 250W at maximum output

External dimensions Width 476x Height 190x Depth 335 mm

Weight 18kg