LUXMAN SQ505X

Commentary

A pre-main amplifier developed by examining the latest theory and method.

The main amplifier uses a 2-power supply system and all stages are directly connected without capacitor. The complimentary service stage uses a pure output system composed of PNP type power transistors to eliminate crossover distortion.
The first stage consists of two differential amplifier circuits.

The equalizer stage of the pre-amplifier section uses a 3-stage direct-coupled circuit, and employs a PNP-NPN-PNP transistor configuration with an advantageous power utilization factor. In addition, as a noise countermeasure, an excellent silicon transistor with ultra-low noise (2SA493) is mainly used throughout all stages of the pre-amplifier section.
In addition, tantalum type and Mylar type with low leakage current are used for the coupling capacitor between stages to suppress unpleasant shock noise when switching the switch.

A friction type double volume is used for the tone control. When turned normally, both the left and right are linked, but it can be adjusted separately.
The bending point frequency can be adjusted by 3 points for both high and low frequencies.

It is equipped with a low booster, low / high filter, and attenuator to enhance the low range.

Various controls and balance volumes are equipped with a Klix/Klukš top.

Model Rating

Type	Solid-state integrated amplifier
Main Amplifier Section
Continuous output	30W + 30W (8 Ω, both channels operating) 35W/35W (8 Ω, single-channel operation)
Total harmonic distortion factor	0.04% or Less (8 Ω, 30W)
Cross modulation distortion factor	0.04% or Less (8 Ω, 30W, 70 : 7 khz = 4 : 1)
Output bandwidth	5 Hz to 50 kHz -3dB (0.04%)
Frequency characteristic	10 Hz to 60 kHz (within -1dB)
Input sensitivity	430 mv (8 Ω, 30W)
Input impedance	50k Ω
Damping factor	30 (8 Ω) 60 (16 Ω)
Residual noise	1 mV or less
Preamplifier Section
Frequency characteristic	10 Hz to 50 kHz -3dB (Aux1)
Total harmonic distortion factor	0.05% or Less (1 kHz, 1 V, Aux1)
Input sensitivity	Phono1, 2 : 2 mV Aux1, 2, 3 : 80 mV
Input impedance	Phono1 : 30k Ω, 50k Ω, 100k Ω Phono2 : 50k Ω Aux1, 2, 3 : 30k Ω
Signal-to-noise ratio	Phono1, 2 : 63 dB or more Aux1, 2, 3 : 80 dB or more
Maximum Allowable Input (1 kHz)	Phono:300mV
Tone control	LUX System NF Type with Bending Point Switching Low Bend Point : Defeat, 150 Hz, 300 Hz, 600 Hz High Frequency Curve Point : Defeat, 6 kHz, 3 kHz, 1.5 kHz
Residual noise	25 μ V or less
Crosstalk (1 kHz)	Phono : -60dB or less Aux : -65dB or less
Filter	Low-cut : 70 Hz (-6dB/oct.) High Cut : 6 kHz (-6dB/oct.)
Low booster	100Hz(6dB/oct)
<General>
Attachment	Attenuator (-18dB) Speaker switch (2 systems) Premain isolation switch Tape monitor (2 systems) Recording output terminal (2 systems)
Semiconductor used	Transistor : 31 Diode : 2 pcs Varistor : 4 pcs
Power consumption	130W (8 Ω simultaneous load at maximum output)
External dimensions	Width 450x Height 160x Depth 268 mm
Weight	10.5kg