LUXMAN SQ202
¥ 141,000 (released in July 1970)
Commentary
The top-of-the-line model of Luxman Pre Main Amplifier at that time.
The main amplifier section has an emitter-follower circuit at the first stage to make the input sensitivity variable.
The circuit configuration is a semi-differential SEPP system using a complimentary service amplifier circuit. All stages are directly connected by using two power supply circuits and eliminating the coupling capacitors at the outputs stage.
A 3-stage direct-coupled NF type circuit is used for the equalizer circuit. In particular, high voltage transistors are used to increase the maximum allowable input voltage to approximately 30 V.
This equalizer circuit has separate Phono1 and Phono2. The input signals are directly connected to each other, and the type of input is switched on the output side. As a result, there is almost no shock noise when switching functions, external noise is reduced, and the S / N ratio is improved.
The output of the equalizer circuit is sent to the next stage via a selector switch and volume balancer.
This amplifier stage consists of two different circuits. Normally it passes through an 18 dB gain amplifier stage, but when the attenuator is operated, it is switched to an emitter-follower circuit without amplification.
The output of this stage is directly connected to the input stage of the main amplifier section if the tone control circuit and filter circuit which follow are turned off.
The tone control circuit uses the NF type of Lux-system, and the bending point can be switched between 3 points for high and 3 points for low.
The filter circuit is an NF type of -12dB per octave, and there are two high and low frequencies.
This circuit is also equipped with four circuits for each frequency, and a signal is sent to each circuit as required. High sound quality is achieved by switching the entire circuit instead of switching the CR element.
The protection circuit uses a current limiting method and operates while the performance continues.
Equipped with a VU meter.
When the selector switch is set to the PRE position, this meter can be used for the output of the preamplifier section. 0 vu is 1 v. When the output of the main amplifier section is monitored, set it to the position of Main0dB or Main-14dB.
The microphone's head amplifier is also independent and can be mixed with other signals. The volume of the microphone is also variable and the degree of mixing can be controlled.
The front panel is equipped with a recording output terminal (tape-out) and a monitor terminal (tape-in).
The preamp section and main amplifier section can be independent.
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Model Rating
| Type | Pre-main amplifier | ||||||
| Main Amplifier Section | |||||||
| Effective power | 70W + 70W (8 Ω, both channel operation) 80W/80W (8 Ω, single-channel operation) 100W/100W (4 Ω, single-channel operation) |
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| Total harmonic distortion factor | 0.1% or Less (8 Ω, 1 kHz) 0.15% or Less (4 Ω, 1 kHz) |
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| Cross modulation distortion factor | 0.2% or Less (8 Ω, 60 hz : 7 khz = 4 : 1) | ||||||
| Output bandwidth | 5 hz to 50 khz -3dB | ||||||
| Frequency characteristic | 10 Hz to 60 kHz -1dB | ||||||
| Input sensitivity | With 700 mv (8 Ω, 50W) Level Adjustment | ||||||
| Input impedance | About 100k Ω | ||||||
| Crosstalk | 66dB | ||||||
| Residual noise | About 1 mv | ||||||
| Damping factor | 35 (8 Ω) 70 (16 Ω) |
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| Attachment | Output indicating meter Main / remote speaker switching Headphone jack AC power supply voltage selector connector AC outlet |
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| Preamplifier Section | |||||||
| Standard output voltage | Pre out:700mV Tape out:110mV |
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| Maximum output voltage | Approx. 5 v | ||||||
| Output impedance | Pre out : Approx. 100 Ω Tape out : approximately 100 Ω |
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| Frequency characteristic | 20 Hz to 70 kHz - within 1 dB | ||||||
| Total harmonic distortion factor | 0.05% or Less (Aux1, 1 khz) | ||||||
| Input sensitivity (Pre out : 700 mV Main output : 50W, 8 Ω) |
Phono1/2:2mV Aux1/3:110mV Aux2 : 110 mV (with level adjustment) Mic mix:2.5mV Tape in:500mV |
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| Input impedance | Phono1 : 50k Ω Phono2 : 30k Ω / 50k Ω / 100k Ω switching type Aux1/2/3 : 100k Ω Mic mix : 50k Ω |
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| Allowable input voltage | Phono1/2:180mV Aux1/3:5V Aux2 : 5 V or more |
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| SN ratio (Pre out : 700 mv) |
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| Input equivalent noise voltage (Pre out:700mV) |
Phono1/2:-120dB/V Aux1/2/3:-110dB/V Mic (Aux1 and mix) : -118dB/V |
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| Residual noise | About 50 μ V | ||||||
| Crosstalk | Phono:66dB Aux:71dB |
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| Tone control | LUX System NF Type with Bending Point Switching High frequency : 1.5 kHz, 3 kHz, 6 kHz, Defeat Low : 600 Hz, 300 Hz, 150 Hz, Defeat |
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| High-cut filter | 5kHz/9kHz, -12dB/oct. 30Hz/80Hz, -12dB/oct. |
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| Loudness (volume -18dB) | + 8.5 dB (50 Hz), + 7.5 dB (10 kHz) | ||||||
| Attenuator | -18dB | ||||||
| Attachment | Tape monitor switch and terminal Mode selector switch Input impedance switching (Phono2) Input level set (Aux2) DIN standard tape connector My Kujac and Level Set |
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| <Others> | |||||||
| Semiconductor used |
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| Power supply voltage | 100 VAC (Standard), 117V/220V/240V | ||||||
| Power consumption | 270W (8 Ω, both channel operation, maximum output) | ||||||
| External dimensions | Width 480x Height 165x Depth 280 mm | ||||||
| Weight | 12.5kg | ||||||
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