HITACHI/Lo-D IA-1000
¥ 85,000 (around 1972?)
¥ 105,000 (around 1974)
Commentary
Integrated amplifier with constant current drive system.
The driver stage of the main amplifier is driven by constant current (high-impedance drive) to completely eliminate crossover distortion and distortion caused by Oire force.
By adopting a constant-current drive system with excellent low-distortion characteristics instead of a direct-coupled system, an excellent linear drive is achieved. In addition, an electronic protection circuit is mounted to provide a safe circuit design.
Uses carefully selected silicon transistors for Hi-Fi.
The equalizer uses a high-gain, low-noise hybrid IC (FA-6001T) to achieve uniform characteristics and a wide dynamic range.
The tone control uses a switch-over type BAX tone circuit.
Equipped with center channel output terminal, it can be developed into center woofer system.
Built-in amplifier for microphone allows mixing with other program sources.
Built-in pre-main isolation terminal allows the pre-amplifier and main amplifier to operate separately.
The preamp section has a built-in amplifier for VU meter. Power check and balance check can be performed by changing the meter range.
Built-in head amplifier for MC type cartridge.
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Model Rating
| Type | Integrated amplifier |
| Circuit system | Quasi complimentary service SEPP Driver stage constant current drive |
| Main Amplifier Section | |
| Continuous output | 55W/55W (8 Ω) |
| Dynamic Output (IHF) | 140W (8 Ω) |
| Total Harmonic Distortion Factor (THD) | 0.1% or Less (at Rated Output) |
| Cross modulation distortion factor | 0.3% or Less (at Rated Output) |
| Frequency characteristic | 20 Hz to 50 kHz ± 1 dB |
| Output bandwidth | 10 Hz to 100 kHz ± 1 dB |
| Signal-to-noise ratio | 100dB |
| Damping factor | 50 (8 Ω, 1 kHz) |
| Input Sensitivity / Impedance | 900mV/50k Ω |
| Preamplifier Section | |
| Output | 900 mv, MAX4V |
| Output impedance | 180 Ω |
| Input Sensitivity / Impedance | Phono1 mm : 2mV/50k Ω Phono1 MC : 0.25mV/200 Ω Phono2 : 5mV/50k Ω Aux1, 2, Tape monitor, Tuner : 140mV/100k Ω Mic : 2mV/35k Ω |
| Output level | Rec out:140mV Din out:40mV Center Channel : 2.5 V (at both channel inputs) |
| Signal-to-noise ratio | Phono1 MM:65dB Phono1 MC:60dB Phono2:70dB Aux1, 2, Tuner : 85 dB Mic:70dB |
| Tone control | Bass : ± 12 dB (100 Hz) Treble : ± 12 dB (10 kHz) |
| Filter | Low:-8dB(50Hz) High:-10dB(10kHz) |
| <Others> | |
| Semiconductor used | Transistor : 36 IC : 2 Diode : 18 pcs |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| External dimensions | Width 446x Height 137x Depth 330 mm |
| Weight | 12.6kg |