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| 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.
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.JPG) |
| 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
Phono2:5mV/50kohm
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
Phono2:70dB
Aux1, 2, Tuner: 85dB
Mic:70dB |
| Tone control |
Bass: ±12dB (100Hz)
Treble: ±12dB
(10kHz) |
| Filter |
Low:-8dB(50Hz)
High:-10dB(10kHz)
|
| <Others> |
| 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 |
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