Audio Database


Lo-D HA-630
69,800yen(1976 release)

The Integrated Amplifier which adopted the Distributed information-processing Network Architecture harmony (E class drive).

The Distributed information-processing Network Architecture harmony (E class drive) scheme was adopted as the power amplifier part, and efficient high power-ization is realized.
Moreover, a current mirror circuitry is adopted as a Class-A drive circuitry, and the push pull drive of the power stage is performed in it.
The high voltage of ±67V and 4 power-source schemes of ±31.5V were adopted as the power source, the high-speed power-source change was performed to the moment level of a music special NetWare program, the improvement in the dynamic margin to the dynamic range of a music special NetWare program was measured, and high promotion of efficiency is attained.
Moreover, high-speed switching elements, such as high resisting pressure and a high-speed switching diode developed especially for the Distributed information-processing Network Architecture harmony scheme, and a high-speed switching diode for large currents, are used.

The three-step hardwired-connection stream composition which uses a PNP transistor for a first rank differential is adopted as the Puri part equalizer stage.

The tone control part was excellent in the gain, and combined IC HA-1456 with high stability, and NF form circuitry, and has obtained the low distortion.
Moreover, if the tone-defeat switchpoint is also carried, the tone switchpoint for adjusting a tone quality is switched and it is made a defeet, regardless of the location of a tone control, the flat frequency characteristic will be acquired in an instant.

32 contact Attenuator type is adopted as volume control, and the exact level control is made possible.

Since the three-step change gain selector is carried, according to the efficiency of a loudspeaker, 0dB -15dB-30dB and Attenuator type volume control are possible.

The Subsonic Filter, the high filter, and the loudness control are carried.

The electronic formula protection network is built in.

The wood case of the photograph was sold as an option option.

Rating of a mode
Form Integrated Amplifier
<Power amplifier part>
Circuit system 2 steps of differentials whole page hardwired-connection 4 power-source quantity
efficiency pure complimentary OCL
(Distributed information-processing Network Architecture harmony scheme)
Effective output 60W+60W (8 ohms, 20Hz - 20kHz, both ch(es) drive)
85W+85W (8 ohms, 1kHz, both ch(es) drive)
110W/110W (ohms [ 8 ],kHz [ 1 ], one-side-channel drive)
Dynamic power (IHF) 320W (8ohms)
THD 0.3% (at the time of an effective output 1kHz, 8ohms)
Cross modulation distortion (70Hz:7kHz=4:1) 0.05% (at the time of 1 / 2 effective output)
Output bandwidth (IHF) 10Hz - 50kHz
Output-terminal A, B:4ohms - 16ohms
A+B: 8ohm-16ohm
Headphone jack: 4ohms - 16ohms
Dumping factor 30 (1kHz, 8ohms) or more
<Preamplifier part>
Circuit system Equalizer amplifier: Differential three-step hardwired connection per step
Control amplifier: NF form
Input sensitivity/impedance Phono1, 2:2.3mV/50kohm
Tuner, Aux, Tape PB1, 2:100mV/50kohm
Phono maximum permissible input Phono1, 2:230mV (RMS, 1kHz)
An Output voltage/impedance Tape rec(pin): 100mV/1kohm
Tape rec(din): 40mV/80kohm
Frequency characteristic Phono(RIAA deflection): 30Hz-15kHz±0.5dB
Tone control Bass: ±10dB (100Hz)
Treble: ±10dB (10kHz)
Filter Low: 25Hz, 12dB / oct
High: 8kHz, 6dB / oct
Loudness control (Volume-30dB) + 8dB (100Hz), +4.5dB (10kHz)
S/N (IHF, A network) Phono:75dB
Tuner, Aux, Tape PB: 90dB
Gain selector 0, -15, -30dB
The semiconductor used Transistor: 44 pieces
Diode: 43 pieces
IC: One piece
Supply voltage AC100V, 50Hz/60Hz
AC outlet Power-switch interlock: One line
Power-switch un-interlocking.: Two lines
Power dissipation
(Electrical Appliance and Material Control Law)
Dimensions Main unit: Width 435x height 144x depth of 353mm
At the time of a wood case using: Width 467x height 179x depth of 400mm
Weight 11kg
Option Wood case LA-200 (6,500yen)