MARK LEVINSON No23L
¥ 1,300,000 (released in April 1987)
¥ 1,040,000 (around 1990)
Commentary
A stereo power amplifier that condenses the performance of the monaural power amplifier No20L.
A high-pass filter and anti-buzz circuit are used in the left and right independent power supply sections to prevent high-frequency noise and asymmetric current contained in the AC line. The transformer is equipped with a 1200 VA rated toroidal transformer independently on the left and right.
Class AB operation is adopted for the output stage. It operates in Class A at the normal output level, and the distortion is reduced by shifting to Class B at large output.
A large-capacity filter condenser and a power transistor are directly connected to the output stage using a oxygen-free copper bus bar, and a triple bypass with a high-quality condenser is used to make the power source more pure.
A two stage differential cascode circuit and a stabilized power supply are used for the voltage amplifier and driver stage.
Balance input is also supported.
Bridge connection is possible, and it can also be used as a monaural amplifier.
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Model Rating
| Type | Stereo power amplifier |
| Configuration | Dual monaural configuration |
| Rated output | 700W + 700W (2 Ω) 400W + 400W (4 Ω) 200W + 200W (8 Ω) 1,400W (4 Ω, bridge connected) 800W (8 Ω, bridge connected) |
| Peak power | 3,025W (20 Hz, 0.5 sec) |
| Frequency characteristic | 4 Hz to 140 kHz -3dB |
| Input impedance | 50k Ω |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 225W (idle) 1200W (8 Ω, at rated output) |
| External dimensions | Width 483x Height 210x Depth 450 mm |
| Weight | 40kg |