Luxman SQ 707 (1969)
A transistorized integrated amplifier introduced in 1969, designed for entry-level audiophiles with Luxman's signature circuit engineering.
Overview
The Luxman SQ 707 is a solid-state integrated amplifier released in August 1969. It combines a preamplifier and power amplifier in one chassis, aimed at providing accessible high-fidelity performance. Designed with Luxman's "LAX" technology, it features independent left and right tone controls, a tape monitor function, and support for two sets of speakers. The unit has a minimalist yet functional layout, with an aluminum front panel finished in a hairline texture and white gold alumite dyeing, complemented by matching knobs and a heat-resistant, leather-textured hood.
Specifications
| Continuous output | 20W/20W (4 Ω) |
| Continuous output | 17W/17W (8 Ω) |
| Total harmonic distortion | 1% or less (at maximum output) |
| Frequency response | 30 Hz to 30 kHz ± 1 dB or less |
| Input Sensitivity / Impedance Phono | 2mV / 50k Ω |
| Input Sensitivity / Impedance Tuner, Aux, Tape rec | 120mV / 50k Ω |
| Signal-to-noise ratio Phono | 60 dB or more |
| Signal-to-noise ratio Tuner, Aux, Tape rec | 65 dB or higher |
| Residual noise | 2 mV or less |
| Equalizer | RIAA |
| Tone control | NF type bending point switching system |
| Damping factor | Approximately 20 (8 Ω, 1 kHz) |
| Accessory circuits | Tape monitor, Attenuator (-18dB), Headphone jack, Mode switching (stereo - mono), Speaker switching (2 systems), Tone control curve point switching |
| Semiconductors used | Transistor Silicon varistor Silicon diode 2SD94 : 4, 2SC853 : 2, 2SA545 : 2, 2SC734 : 2, 2SC694G : 2, 2SC693GU : 8, SV-03 : 2, 1S1850 : 1 |
| Power consumption | 30W (no signal), 90W (at maximum output) |
| Dimensions | Width 373 x Height 125 x Depth 227 mm |
| Weight | 4.9kg |
Design
The SQ 707 uses a quasi-complementary service system circuit in the power amplifier section and features an SEPP-OTL (Single-Ended Push-Pull, Output Transformer-Less) output stage, with no protection circuit per Luxman's unique design. The preamp section employs an NF-type equalizer and NF-type tone control using selected low-noise transistors. It includes two sets of speaker terminals and uses a Luxman-original speaker terminal design. The internal layout is rationalized without a sub-chassis. The front panel has an aluminum hairline finish with white gold alumite dyeing, and the hood is made of heat-resistant high-impact styrol with a leather-like texture.
Market
The SQ 707 was originally priced at ¥35,000, with an optional wooden case available for ¥3,500.
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