Solid State DC
Preamplifier
A new realtime
processed DC preamplifier for audio purists!
Pure DC
Configuration
The reason why we at
Lux decided to adopt a DC configuration is to eliminate only harmonic
distortion that appears in the form of a written specification but also phase
or transient distortion that cannot be rated by specification but still has a
vital influence on tonal quality. As a matter of course, to ensure faithful
amplification of music signals of random nature, the input stages of an amp are
of great importance, and Dc amplification is featured in all stages including
equalizer and flat amp.
In the equalizer
stage, our exclusive DML-IC's (where the 1st stage FET differential amp and its
supporting cascode, current mirror and constant current circuits are
effectively put into a block) are combined with a constant current cascode
circuit and output circuit of class "A" SEPP operation. Similarly, in
the flat amp section, the same DML-IC's are arranged with an output circuit of
constant current emitter-follower.
Removal of DC Drift
To eliminate the DC
drift - an inherent draw-back to Dc amp, our DML-IC is ideal in that it is
perfectly shielded from external ambient fluctuation, and truly unconditional
stability is ensured.
Improvement of
Various Characteristics:
Thorough study was
undertaken to improve various characteristics. Carefully arranged layout of
chassis eliminates most of the shielded wires at the shortest distance. Such basic circuits as
equalizer and flat amp are arranged in a single piece of large circuit board,
and perfectly separate wiring is rendered between right and left channels. All
of these structures contribute much to the total dependability of the DC
amplifier ensuring superb frequency response and S/N ratio not to mention of
unparalleled low channel separation.
New Type Volume
Control
A new type of volume
control of high precision is provided that offers not only continuous variation
of volume level but virtually no gang-error between the right and left
channels. Also meticulous care is paid to the selection of all components used,
such as resistors, variable resistors and capacitors.
Twin T Filter
Such noises as are
triggered by warps of disc, resonance of tonearm etc. Are out of the audible
range below 10 Hz but these cause a harmful intermodulation distortion by
activating the cones of loudspeakers. To remove such harmful ultra low
frequency noises, a twin T filter is provided which is composed of capacitors
and resistors without active components. With this filter, only ultra low
frequencies of 5 -10 Hz are effectively removed without influence on the
audible frequency range.
Lux's exclusive
Linear Equalizer is featured to allow accurate compensation of frequency
response on disc and prerecorded tape. An audio attenuator permits pre-setting
rom -15 dB to -40 dB. Also, all the necessary functions of a pre amp are
provided such as dual tape monitor, tape dubbing circuits and recording output
switch, etc.
Specifications
Output Voltage: (distortion no more than 0,005%)
Pre out : typical
1V, max. 18V
Rec out : typical
150 mV, max. 18V
Output
Impedance:
Pre out : 100 ohms
Rec out : 100 ohms
Total Harmonic
Distortion:
Phono, rec out 2V,
20-20 kHz : no more than 0,005%
Tuner, Aux, Monitor,
Pre out 2V, 20-20 kHz : nomore than 0,005%
Rated I. M.
Phono, Rec out 2V,
60Hz:7khz=4:1 : no more than 0,002%
Tuner, Aux,
Monitor,Pre out 2V, 60Hz:7kHz=4:1 : no more than 0,002%
Frequency
Response:
20 Hz - 20,000 Hz
(within ±0,2 dB) (phono -1/2)
1 Hz - 200,000 Hz
(within -0,5 dB) (tuner, aux-1/2, monitor-1/2)
Input Sensitivity
(pre. Out 1V):
Phono 1/2 : 2,3 mV
Tuner, Aux1/2,
Monitor 1/2 : 150 mV
Input Impedance:
Phono 1 : 30 k -50 k
-100 k ohms (variable)
Phono 2 : 50 k ohms
Tuner, Aux 1/2 : 50
k ohms
Monitor 1/2 : 60 k
ohms
Signal-to-Noise
Ratio:
Phono 1/2 : better
than 96 dB
Tuner, Aux 1/2,
Monitor 1/2 : better than 100 dB
Input Equivalent
Noise:
Phono 1/2 : no more
than -135 dB/V
Tuner, Aux 1/2 : no
more than -117 dB/V
Monitor 1/2 : no
more than -116,5 dB/V
Phono Overload
Voltage: no less than 300 mV (1 khz,
RMS)
Channel
Separation:
Phono 1/2 (1kHz) :
better than 85 dB
Tuner, Aux 1/2,
Monitor 1/2 (1kHz) : better than 95 db
Additional
Features: Linear Equalizer, Subsonic
Filter, Input Impedance Adjuster, Tape Monitor, tape Dubbing, Rec. Off Switch,
Audio Attenuator (with prestet position)
Power
Consumption: 15 W
Dimensions (W x H x
D): 438 x 78 x 363 mm (17-1/4" x
3-1/16" x 14-5/16")
Weight: 6,5 kg (14,3 lbs) net