LUXMAN SQ507X

Commentary

Pre-main amplifier corresponding to the high power model of SQ505X.

The main amplifier section uses ± 2 power supply and all stages are directly connected without capacitor. The complimentary service stage uses pure output method combining PNP and NPN type power transistors to eliminate crossover distortion.
The previous stage consists of a two stage differential amplifier circuit to ensure stable operation.

The equalizer stage of the preamp section uses a new 3-stage direct connection circuit composed of PNP-NPN-PNP type transistors with high power utilization, and an emitter follower circuit is provided behind this stage to keep the input impedance of the Aux terminal high.
To reduce noise, we use ultra-low-noise transistors for all stages of the preamplifier section, and we use tantalum type and Mylar type coupling capacitors with low leakage current to reduce shock noise during switching.

The input impedance of the Phono1 terminal can be switched in three stages.
There is also a level set at the Aux connector.

Equipped with a low booster, high / low filter, and attenuator to increase the low frequency range.

The tone control is equipped with a curve point switch.

Model Rating

Type	Solid-state integrated amplifier
Main Amplifier Section
Continuous output	50W + 50W (8 Ω, both channels operating) 60W/60W (8 Ω, single-channel operation)
Total harmonic distortion factor	0.04% or Less (8 Ω, 50W)
Cross modulation distortion factor	0.04% or Less (8 Ω, 50W, 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	580 mv (8 Ω, 50W)
Input impedance	50k Ω
Damping factor	40 (8 Ω) 80 (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 : 90 mV or more (adjustable) Aux2, 3 : 80 mv
Input impedance	Phono1 : 30k Ω, 50k Ω, 100k Ω Phono2 : 50k Ω Aux1 : 50k Ω Aux2, 3 : 200k 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 : 33 Diode : 2 pcs Varistor : 4 pcs
Power consumption	200W (8 Ω simultaneous load at maximum output)
External dimensions	Width 450x Height 160x Depth 268 mm
Weight	11kg