Audio Database


HITACHI/Lo-D IA-1000 85,000yen( at the 1972 time?)
105,000yen (around the 1974 time)

Integrated amplifier which adopted the constant current drive system.

By forming the driver stage of a main amplifier into a constant current drive (high-impedance drive), crossover distortion and the distortion at the time of a small input are eliminated thoroughly.

While attaining the linear drive excellent in not daring to adopt a direct coupling system but adopting the constant current drive system which was excellent in the low distorted property, the electronic protection network was carried and the safe circuit design has been performed.

The silicon transistor for Hi-Fi selected carefully is adopted.

High gain and a low noise type hybrid IC (FA-6001T) were adopted as the equalizer part, and the uniform property without variation was acquired, and the large dynamic range is taken.

The BAX type tone circuitry of a switchpoint switching type is adopted as a tone control.

It is possible to carry the center channel output-terminal and to develop into a center Woofer scheme.

The amplifier only for a mic is built in and mixing with other special-NetWare-program sources is possible.

It is possible to carry the pre-main separation termination and to operate a preamplifier and a main amplifier separately.

The amplifier only for VU meter is built in the preamplifier part. An output checking and balance check are possible by switching of a meter range.

The head amplifier for MC type cartridges is built in.


Rating of a mode
Form Integrated amplifier
Circuit system Semi- complimentary SEPP
Driver stage constant current drive
<Main-amplifier part>
Consecutive output 55W/55W (8ohms)
Dynamic output (IHF) 140W (8ohms)
THD (THD) 0.1% or less (at the time of an Output power)
Cross modulation distortion 0.3% or less (at the time of an Output power)
Frequency characteristic 20Hz-50kHz±1dB
Output bandwidth 10Hz-100kHz±1dB
SN ratio 100dB
Dumping factor 50 (8 ohms, 1kHz)
Input sensitivity/impedance 900mV/50kohm
<Preamplifier part>
Output 900mV, MAX4V
Output load impedance 180ohms
Input sensitivity/impedance Phono1 man-month: 2mV / 50kohm
Phono1 MC: 0.25mV/200 ohms
Aux1, 2, Tape monitor, Tuner:140mV/100kohm
Mic: 2mV/35kohm
Output voltage Rec out:140mV
Din out:40mV
Center channel: 2.5V (in both ch(es) input)
SN ratio Phono1 MM:65dB
Phono1 MC:60dB
Aux1, 2, Tuner: 85dB
Tone control Bass: ±12dB (100Hz)
Treble: ±12dB (10kHz)
Filter Low:-8dB(50Hz)
The semiconductor used Transistor: 36 pieces
IC: Two pieces
Diode: 18 pieces
Supply voltage AC100V, 50Hz/60Hz
Dimensions The width 446x height 137x depth of 330mm
Weight 12.6kg