Audio Database

Image of the M-73
Commentary

Stereo power amplifier with 2 power transformers.

A ± 2 power supply, a 2-stage differential amplifier current mirror circuit, and a final stage parallel push-pull pure complimentary service circuit are used.

The power supply section employs a two power transformer to enhance dynamic characteristics, eliminating mutual interference between channels.
In addition, a 12,000 μ Fx4 condenser can be used to reproduce high-amplitude low-frequency continuous sound with sufficient margin.

Equipped with a large peak power meter with a logarithmic compression circuit that can directly read the output.

It uses a protective circuit composed of highly reliable power relays and quick response electronic circuits to protect speakers and transistors from accidents.

Equipped with two speaker output jacks, A + B playback is also possible.

A panel design that can be mounted on an EIA-standard rack.

Model Rating
Type Stereo power amplifier
Circuit system 2-stage all-stage direct-coupled parallel PP pure complimentary service OCL circuit
Effective output (both channels driven, 20 Hz to 20 kHz) 85W + 85W (8 Ω)
Harmonic distortion factor (20 Hz to 20 kHz at effective output) 0.05%
Intermodulation distortion factor (50 hz : 7 khz = 4 : 1) 0.05%
Output Bandwidth (IHF, double-channel drive, 8 ω) 5 Hz to 45 kHz (Distortion Factor 0.05%)
Frequency response (at 1W output) 5 Hz to 100 kHz + 0 -1dB
Input terminal Input : 1V/50k Ω
Output terminal A / B : 4 Ω ~ 16 Ω
A + B : 8 Ω ~ 16 Ω
Headphone : 4 Ω ~ 16 Ω
Damping factor (20 Hz to 20 kHz, 8 Ω) 30
Signal-to-noise ratio (IHF, A-network, short circuit) 115dB
Power supply voltage 100 VAC, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 210W
Maximum Power Consumption 650W
External dimensions Width 480x Height 142x Depth 390 mm
Weight 15.2kg
EIA standard rack mounting unit 3U