Luxman-C12-Schematic-2 电路图 维修手册.pdf

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1、Luxman C12 control amplifier &M12 power amplifier General: This pre-amplifier or control amplifier as Luxman likes to call it and power amplifier set was produced in the early 1980s. They are part of the Laboratory Standard Series just as i.e. the T12 and the L10. Special futures: The pre-amp sectio

2、n of this set, the C12 was remarkable because of several features. It employed no tone-control, it did however have a Linear Equalizer. Below is explained what it does: All the program sources available are not always perfect. Record discs, cds and tapes, as a program source, are liable to have a sl

3、ight deviation of linear nature depending on the manufacturers. For example, all recordings are equalized in accordance with RIAA standard, but its quite common to encounter variations in overall tonal balance from one recording to the other. Also, differences in listening environment and room acous

4、tics often require a subtle degree of tonal compensation that conventional tone controls cannot correct because of their wide range and overlapping characteristics. The Linear Equalizer control provides a form of tonal compensation especially intended for this sort of tendency. With the control in i

5、ts mids position, flat frequency response is achieved. Switched to the up-tilt positions, the entire response curve is rotated on a 1 kHz axis so as a linear increase treble response while simultaneously decreasing bas response. Conversely, selection of one of the down-tilt positions rotates the res

6、ponse curve in a clockwise direction, providing a gradual decrease of treble response and simultaneous increase of bass response. Degree of slope for either positive or negative settings has been carefully preset, and the overall response maintains complete linearity from 50 Hz to above10 kHz, unlik

7、e the curvature in response normally associated with ordinary tone controls. Specifically, when the control is turned to the max up-tilt position, it will decrease bass and increase treble by 2 dB at 100 Hz and 10 kHz respectively. Selection of the max down-tilt position will decrease treble and inc

8、rease bass by 2 dB at the same reference frequencies. At the center of the rotation, components which consists the Linear RadioFans.CN 收音机爱 好者资料库 Equalizer are all by-passed to realize flat frequency response. The control is inserted in the flat amp circuit and is effective on ALL program sources. I

9、t introduces no increase of harmonis distortion in any of his settings because of the inherently linear nature of this circuit. Schematic: C12 schematic diagram: RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Modifications: The DML ics employed in both units are often the cause of problems and need

10、 to be replaced by discrete parts. Of the DML-01 there seem to be 3 different versions. Of the DML-02 is only one version known. The layout of the DML-01 version 2 is below: The schematic diagram of the DML-01 version 2: The schematic diagram of the DML-01 version 1 is below: Below the schematic diagram of the DML-02: Sound: These series of High Quality audio components soon got ledgendary of their outstanding quality and excelend sound quality.