Luxman M-2000
(1976 - 1980)

SOLID STATE BASIC POWER AMPLIFIER
To complete our series of prestigious power amplifiers, LUX's continuous and dedicated R&D has now yielded the new M-2000 employing the basic design concept of the super-powered M-6000.

A 2-stage differential input OCL pure complementary circuit is arranged in the main amp section with parallel push-pull configuration at the output stage. An emitter-follower circuit composed of 2 transistors (one for constant current) is placed between Class A operational pre-driver stage and Class B operational output stage which electronically isolates both stages. This not only protects the pre-driver stage from possible influence of impedance fluctuation triggered by load conditions but also ameliorates load condition at the treble range of the pre-driver characteristics throughout the entire audible range with slight phase compensation.

Moreover, to improve tonal quality, meticulous care is paid even to the physically invisible sphere such as selection of componentry, etc. An independent power supply is provided for both left and right channels with 2 each electrolytic capacitors. The driver stage is operated by constant current for stable performance. Perfect measure is taken against surge current at the time of turning on the power switch.

DC potential sensing circuit is provided for protection of loudspeakers, while over current limiting sensor is for protection of the amplifier. At the input circuit we use a precision detent potentiometer of 1dB increment, and an emitter-follower is provided to ensure optimum operation of this amplifier regardless of input condition."