Mark Levinson 20.5 Mark Levinson 20.5 Mono Power Amplifiers Boxed

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Mark Levinson 20.5 Mono Power Amplifiers Boxed

Mark Levinson 20.5

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Última actualización 4.06.2026

Descripción Descripción original Inglés, Otras traducciones de idiomas son traducciones y pueden contener errores. Inglés Alemán Español Turco Very good cosmetically and full working order.

Monaural power amplifier developed with improved sound quality based on No20L.

The main change from No20L to No20.5L is the improvement of the circuit and circuit elements from the input stage to the voltage amplification stage.

Also, taking advantage of the unique modular construction, it is realized by redesigning a single plug-in PC board (card module).

The power supply section is equipped with two large-capacity toroidal transformers of 600 VA and has a completely ± independent configuration. The electrolytic capacitor is connected in parallel with a high-quality polyethylene type with extremely low noise and excellent impedance characteristics. Moreover, a large-capacity and high-speed regulator circuit is adopted to control all stages of the power amplifier including the output stage.

AP-4 circuit board is used for input stage and amplification stage.

The voltage amplification stage consists of a 2-stage differential AC amplifier, the first stage consists of a differential circuit with NPN transistor, and the FET is cascode-connected. The second differential amplifier consists of an active broad based current mirror push-pull operation, the voltage amplification stage consists of a 3-stage Darlington configuration, the driver stage consists of triple push-pull, and the output stage consists of an 8-stage para-push-pull configuration.

As the power transistor, several candidates selected from all over the world were subjected to characteristic tests again, and the remaining ones were put on for a long time hearing test, and only one bipolar transistor was picked up.

The protection circuit is designed to eliminate relays, which can cause sound quality degradation, and to turn off the power in the event of an accident.

In addition to the highly reliable CAMAC terminal, the XLR (Canon) terminal is also available for balanced input.

In addition, the INVERTING terminal is mounted, and it is possible to bridge two units.

Type Monaural power amplifier

Circuit Complimentary service push-pull circuit by pure class A operation at all stages

Rated output 400W (2 Ω)

200W (4 Ω)

100W (8 Ω, 20 Hz to 20 kHz, THD0.1% or less)

Input impedance 50k Ω

Pwer 100 VAC, 50Hz/60Hz

Power consumption Approx. 500W

External dimensions Width 483x Height 210x Depth 560 mm

Weight 33kg

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Lugar de envío
Norfolk NR35 - United Kingdom

Países de envío
el mundo entero

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