Pioneer M-73
¥ 75,000 (around 1980)
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 |