Lo-D HA-5700

Commentary

Pre-main amplifier using power MOS FET.

The power amplifier circuit is basically the same as the HMA 9500 and uses a simple 3-stage direct connection DC power circuit.

Newly developed low-noise integrated circuits are used for the equalizer amplifier and tone amplifier. The circuit configuration is a differential input 3-stage directly connected push-pull output.
The use of high-gain integrated circuits makes it possible to connect MC cartridges.

The power supply section uses two power transformers and a smoothing capacitor (1000 μ F + 1000 μ F) to provide a sufficient power supply section for large amplitude.

Equipped with a low filter, tone defeat switch, monitor switch, loudness and speaker selector switch.

Model Rating

Type	Pre-main amplifier
Effective power	50W + 50W (8 Ω, double-channel drive, 20 hz to 20 khz, Tuner in)
Total harmonic distortion factor	0.02% (20 Hz to 20 kHz, 8 Ω at Rated Output)
Output bandwidth	5 hz to 40 khz (0.05% at 25W output, 8 Ω, Tuner in)
Intermodulation distortion factor (60 hz : 7 khz = 4 : 1)	0.03% (Tuner in at 25W output)
Frequency characteristic	Phono : 20 Hz to 20 kHz ± 0.3 dB Tuner, Aux, Tape1, 2 : 10 Hz to 100 kHz + 0.5 -4.5 dB
Input Sensitivity / Impedance	Phono MM : 2.5mV/47k Ω Phono MC : 0.25mV/100 Ω Tuner, Aux, Tape1, 2 : 150mV/47k Ω
Output Level / Impedance	Rec out : 150mV/470 Ω
Phono maximum allowable input (1 kHz, 0.01%)	MM:250mV MC:25mV
Signal-to-noise ratio (IHF / A network)	Phono MM:80dB Phono MC:60dB Tuner, Aux, Tape1, 2 : 100 dB
Tone control	Bass : ± 8 dB (100 Hz) Treble : ± 8 dB (10 kHz)
Low filter	15 Hz, 6dB/oct.
Loudness (-30dB)	+3dB(10kHz) +6dB(100Hz)
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law)	140W
AC outlet	Power switch interlock : 1 system Power switch not linked : 2 systems
External dimensions	Width 435x Height 110x Depth 383 mm
Weight	10.8kg