Audio Database


Lo-D HA-310
35,800yen (1975 release)

The Integrated Amplifier which aimed at the cost cut taking advantage of the semiconductor technology maintaining the high level performance.

The power amplifier part has whole page hardwired-connection pure complimentary grounded-emitter inverted darlington circuit composition.

A change using of Low and High is possible for a Phono input.

The electronic formula protection network is carried.

The mic mixing circuitry, the loudness switchpoint, and the tapes monitor switchpoint are carried.

Rating of a mode
Form Integrated Amplifier
<Power amplifier part>
Circuit system 1 step of differential whole page hardwired-connection grounded-emitter inverted Darlington pure complimentary OCL
Effective output
40Hz - 20kHz, both ch(es) drive : 35W+35W (8ohms)
1kHz, both ch(es) drive : 45W+45W (4ohms)
37W+37W (8ohms)
1kHz, one-side-channel drive : 52W/52W (4ohms)
42W/42W (8ohms)
Dynamic power (IHF) 100W (8ohms)
THD 0.8% (at the time of an effective output)
0.06% (at the time of 1 / 2 effective output 1kHz)
Cross modulation distortion (70Hz:7kHz=4:1) 0.15% (at the time of 15W output)
0.1% (at the time of 1W output)
Output bandwidth (IHF) 10Hz - 45kHz
Output-terminal A, B:4ohms - 16ohms
A+B: 8ohm-16ohm
Headphone jack: 4ohms - 16ohms
Dumping factor 40 (1kHz, 8ohms) or more
<Preamplifier part>
Circuit system Equalizer amplifier: Two-step hardwired-connection 2 power-source drive type
Control amplifier: CR form
Input sensitivity/impedance Phono low: 2mV/57kohm
Phono High: 5mV/57kohm
Tuner, Aux:200mV/40kohm
Mic: 7mV/8kohm
Phono maximum permissible input Phono low: 120mV (RMS, 1kHz)
Phono High: 280mV (RMS, 1kHz)
An Output voltage/impedance Tape rec(pin): 190mV/1kohm
Tape rec(din): 40mV/75kohm
Frequency characteristic Phono(RIAA deflection): 30Hz-15kHz±1dB
Tone control Bass: ±8dB (100Hz)
Treble: +7.5dB--9dB (10kHz)
Loudness control (Volume-30dB) + 7dB (100Hz), +4dB (10kHz)
S/N (IHF, A network, input short-circuit) Phono low:75dB
Phono high:80dB
The semiconductor used Transistor: 28 pieces
Diode: 21 pieces
Supply voltage AC100V, 50Hz/60Hz
AC outlet Power-switch interlock: One line
Power-switch un-interlocking.: One line
Power dissipation (Electrical Appliance and Material Control Law) 73W
Dimensions Width 390x height 126.5x depth of 327mm
Weight 6.8kg