Marantz SM700
¥ 690,000 (released in 1981)
Commentary
This stereo power amplifier was developed to realize the ideal amplifier called "straight wire with gain".
All stages including the output stage using 12 metal can power transistors per channel are complete push-pull configuration complete DC amplifier realized the unique Low-TIM design, and the purity of high power is enhanced with a straight signal path that eliminates all capacitors and switching contacts from input to output.
Two types of speaker terminals are installed, one is direct and the other is sub 1 and sub 2.
With the direct terminal, the emitter and output terminal of the power transistor are directly connected, and high-purity power can be delivered.
The protector that protects the speakers from DC components uses an SCR crowbar circuit with no output contacts to achieve reliable operation without degrading sound quality.
The power supply section uses a 800 VA large-capacity transformer and a custom capacitor, making it completely independent of L and R.
The peak power meter uses a high-precision logarithmic compression indication type that can directly read the output of 8 Ω load.
2-stage switching of recovery time is possible.
The heat radiation system adopts a high-efficiency type with a unique finger decipeter and a two speed clean fan.
All wiring is made of high-purity oxygen-free copper wires, a high-capacity power cord for polarity display, and a chassis structure that eliminates magnetic strain.
Model Rating
Type | Stereo power amplifier |
Rated output | 450W + 450W (4 Ω) 265W + 265W (8 Ω) |
Total harmonic distortion factor | 0.01% or less |
Frequency characteristic | DC ~ 100 kHz + 0 -1dB |
Input Sensitivity / Input Impedance | 1.5V/70k Ω |
Damping factor | 300 or More (8 Ω) |
Signal-to-noise ratio (IHF-A) | 123dB |
Power consumption (Electrical Appliance and Material Control Law) | 580W |
External dimensions | Width 483x Height 182x Depth 522 mm |
Weight | 48kg |