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| Lo-D HMA-8300 |
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| 140,000yen(1976 release) |
Stereo power amplifier which adopted the Distributed
information-processing Network Architecture harmony (E class drive) scheme.
The Distributed information-processing Network Architecture harmony
scheme is a circuit system which realized the Oide power-ization of amplifier
efficiently through the musical analysis of a level distribution, at the peek of
a music signal, the Oide power and usual work as Koide power, and an operation
equivalent to the Oide power amplifier is carried out effectually.
This has
realized the weight saving of amplifier, expansion of an area of safe operation,
low-pricing, and low-distortion-ization.
the Distributed
information-processing Network Architecture harmony scheme is adopted as a power
part, it consists of a low voltage power source and each ±2 power source (a
total of four power sources) of the high voltage power supply, and this has
realized Oide power.
A current mirror circuitry is adopted as a Class-A
driver circuitry, and the power stage drive is performed.
The meter which can carry out the Direct reading of the peaking capacity
level in the value of power is carried.
The Subsonic Filter which eliminates the harmful oscillation besides the
audio frequency band generated from the curvature of a record etc. is carried.
This filter can carry out "on-off" if needed.
The transformer adopted as the power-source part has adopted the thing
of about 9kg heavy weight class, and two low 18,000 micro F(63V)±2 power-source
dual chemical capacitors of a grounding impedance, and two 10,000-micro F (125V)
four capacitors are adopted as Kem Cong for power sources.
The
loudspeaker relay newly designed with the formation of large power is an object
for the large power sources of the rated current (AC15A) and surge current
(AC60A), and has become a thing in which a direct-current shutdown is also
possible.
Furthermore, a contact structure is a silver contact, takes a
large contact surface product, is holding down to less than 25mohm, and is
reducing the tone-quality failure. Moreover, since the structure of blowing out
a magnetism with the magnet which contains the arc discharge between contacts
which poses a problem at the time of the Oide power shutdown accompanying the
formation of large power is used, even if it uses it for a long period of time,
the failure of contact resistance etc. has decreased.
The carrying
handle currently used with the photograph was sold as an option option.
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| Form |
Stereo power amplifier |
| Circuit system |
Two-step differential-amplification whole page hardwired-connection 4 power-source
quantity
efficiency pure complimentary OCL
(Distributed information-processing Network Architecture harmony scheme)
|
Effective output
(Both ch(es) drive, THD
0.1%) |
200W+200W (4 ohms, 20Hz - 20kHz)
200W+200W (8 ohms, 20Hz - 20kHz)
220W+220W (8 ohms, 1kHz)
|
THD
(20Hz - 20kHz) |
0.1% or less (at the time of an effective
output)
0.005% or less (at the time of 100W output)
0.03% or less (at
the time of 1W output) |
| Output bandwidth (IHF) |
5Hz - 30kHz (8ohms) |
| Frequency characteristic |
5Hz-80kHz+0 -1 dB |
| Input sensitivity/impedance |
1V/50kohm |
| Load impedance |
4ohm-16ohm |
| Dumping factor (8ohms) |
50 (20Hz - 20kHz)
100(1kHz)
|
| Channel separation |
80dB (1kHz, 8ohms) |
| S/N (IHF, A network) |
110dB |
| The semiconductor used |
Transistor: 40 pieces
Diode: 47 pieces
IC: Two pieces |
| Supply voltage |
AC100V, 50Hz/60Hz |
| Power dissipation |
210W |
| Dimensions |
Width 435x height 182x depth of 395mm
|
| Weight |
24kg |
| Option |
Carrying handle TA-1 (5,000yen) |
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