ALPINE/LUXMAN LV-105u
¥ 129,000 (released in October 1986)
Commentary
This pre-main amplifier has been improved while taking over the concept of the LV 105.
Like the LV 105, it is a hybrid configuration of a vacuum tube and MOS-FET. An FET is used for the first stage, a 3-pole tube is used for the pre-driver stage, which requires high voltage resistance and linearity, and MOS-FET is used for the last stage.
By using a voltage-controlled amplifier circuit for all stages, current distortion is eliminated and high purity power is achieved.
The S. T. A. R. circuit is used to supply power directly to each stage without sharing the feed line and ground line for each stage of amplification. In addition, the LV 105 u also uses the S. T. A. R. circuit for the signal path. The ground line for the signal system, which is generally treated as a shared part, is independent up to each amplification reference point of the amplifier stage.
As a result, the S/N of the auditory sense is improved and sound quality is improved.
The built-in CD straight-through function bypasses part of the circuit and sends the CD signal to the power amplifier at the shortest distance, thereby preventing sound quality degradation due to the routing of switches and wires.
Equipped with two AV terminals, one of which can be switched between front and rear.
It has a built-in video buffer amplifier that can reliably send up to 6 mhz video signals to a monitor or VCR.
The power supply section is equipped with a powerful large transformer with a core 50% thicker than usual to improve sound quality.
The signal processing jacks allow you to connect graphics equalizers and surround processors.
An MC/MM high-gain equalizer amplifier using a low-noise FET is mounted.
Equipped with a mode switch capable of switching between stereo and mono.
It is equipped with functions such as loudness.
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Model Rating
| Type | Pre-main amplifier |
| Rated output | 105W + 105W (6 Ω, 20 Hz to 20 kHz) 80W + 80W (8 Ω, 20 Hz to 20 kHz) |
| Harmonic distortion factor | 0.008% (6 Ω, 1 kHz) |
| Input sensitivity | Phono MM:2.0mV Phono MC : 150 μ V CD, Tuner, Line : 150 mv |
| Input impedance | Phono MM : 47k Ω Phono MC : 100 Ω CD, Tuner, Line : 47k Ω |
| Signal-to-noise ratio (IHF) | Phono MM:90dB Phono MC:70dB CD, Tuner, Line : 110 dB |
| Frequency characteristic | Phono MM/MC : 20 Hz to 20 kHz ± 0.3 dB CD, Tuner, Line : 1 hz to 200 khz -3dB AV1 / 2 : 10 Hz to 6 MHz -3dB |
| AV input terminal | Route 3 |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 185W |
| External dimensions | Width 438x Height 148x Depth 353 mm |
| Weight | 11.5kg |