LUXKIT A809
¥ 20,000 (around 1980)
Commentary
A800 series MC head amplifier kit.
DC amplifier configuration is used.
A duo-beta circuit is used for the head amplifier circuit, and high sound quality is achieved by combining an appropriate NFB for the middle and high sound range and a DC servo for tightening the low frequency range.
The A809 also has a duo-beta circuit equalizer, which can be directly connected to a volumetric power amplifier.
It can also be used as a microphone amplifier.
In this case, it is necessary to raise the input impedance by remodeling, and the gate resistance of the first stage FET should be changed from 100 Ω to 47k Ω.
However, in this case, oscillation may occur depending on the wiring, and noise may be slightly deteriorated.
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Model Rating
| Type | MC head amplifier kit |
| Head Amplifier Section | |
| Amplification factor | 20 dB (30 dB with wiring change) |
| Total harmonic distortion factor | 0.005% (20 Hz to 20 kHz, 1 V Output) |
| Frequency characteristic | 5 Hz to 500 kHz -0.5 dB |
| Input reduced noise | -145dBV (IHF-A, input short) |
| Input impedance | 10 Ω, 50 Ω, 100 Ω |
| Equalizer Section | |
| Rated output | 150mV |
| Input sensitivity | 2mV |
| Total harmonic distortion factor | 0.005% (20 Hz to 20 kHz, 2 V Output) |
| Frequency characteristic | 20 Hz to 20 kHz ± 0.5 dB |
| Signal-to-noise ratio | 75 dB (IHF-A, input short) |
| Input impedance | 50k Ω |
| Channel separation | 70dB |
| <General> | |
| External dimensions | Width 290x Height 76x Depth 142 mm |
| Weight | 1.8kg |
