Lo-D HA-310
¥ 35,800 (released in 1975)
Commentary
A pre-main amplifier that utilizes semiconductor technology to maintain high performance while reducing costs.
All stages of the power amplifier are directly connected pure complimentary service emitter-grounded inverted Darlington circuit configuration.
The Phono input can be switched between Low and High.
Equipped with electronic protection circuit.
Equipped with a microphone mixing circuit, a loudness switch and a tape monitor switch.
Model Rating
| Type | Pre-main amplifier | ||||||
| Power Amplifier Unit | |||||||
| Circuit system | Inverted Darlington pure complimentary service OCL | ||||||
| Effective power |
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| Dynamic Power (IHF) | 100W (8 Ω) | ||||||
| Total harmonic distortion factor | 0.8% (at effective output) 0.06% (1 kHz at 1/2 effective output) |
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| Intermodulation distortion factor (70 hz : 7 khz = 4 : 1) | 0.15% at 15W output 0.1% (at 1W output) |
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| Output Bandwidth (IHF) | 10 Hz to 45 kHz | ||||||
| Output terminal | A, B : 4 Ω ~ 16 Ω A + B : 8 Ω ~ 16 Ω Headphone terminal : 4 Ω ~ 16 Ω |
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| Damping factor | 40 or More (1 kHz, 8 Ω) | ||||||
| Preamplifier Section | |||||||
| Circuit system | Equalizer amplifier : 2-stage direct connection 2 power source drive type Control Amplifier : CR Type |
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| Input Sensitivity / Impedance | Phono low : 2mV/57k Ω Phono High : 5mV/57k Ω Tuner, Aux : 200mV/40k Ω Mic : 7mV/8k Ω |
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| Phono maximum allowable input | Phono low : 120 mV (RMS, 1 kHz) Phono High : 280 mv (RMS, 1 khz) |
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| Output Level / Impedance | Tape rec (pin) : 190mV/1k Ω Tape rec (din) : 40mV/75k Ω |
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| Frequency characteristic | Phono (RIAA deviation) : 30 Hz to 15 kHz ± 1 dB | ||||||
| Tone control | Bass : ± 8 dB (100 Hz) Treble : + 7.5 dB ~ -9dB at 10 kHz |
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| Loudness control (Volume -30dB) | + 7 dB (100 Hz), + 4 dB (10 kHz) | ||||||
| S/N (IHF, A-Network, input short) | Phono low:75dB Phono high:80dB |
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| <General> | |||||||
| Semiconductor used | Transistor : 28 Diode : 21 |
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| Power supply voltage | 100 VAC, 50Hz/60Hz | ||||||
| AC outlet | Power switch interlock : 1 system Power switch not linked : 1 system |
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| Rated power consumption (Electrical Appliance and Material Control Law) | 73W | ||||||
| External dimensions | Width 390x Height 126.5x Depth 327 mm | ||||||
| Weight | 6.8kg | ||||||