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The Rega Cursa 3 Amplifier is a high performance audio pre-amplifier
using the Improved "type 3" Rega Alpha-Encoder control
system comprising of high quality loss-less relays, and a digitally
controlled analog switched resistor network volume control. The
Cursa 3 is housed in the Rega custom-built extruded aluminum case.
Rega has further improved the technical & sonic performance
by using a dual FET differential input stage within the discrete
Op-Amp circuit.Evox Polypropylene capacitors have been used in the
signal path. The flexibility has been further improved by adding
a second Tape input.
The Cursa 3 is a fully remote controlled pre amplifier with full
flexibility within the range. There are three phono input plug in
card options; of Moving Magnet, Moving Coil & standard Line
level.
There are two Power amplifier outputs, which can be set to any one
of the three different output levels. This enables the Cursa to
drive most types of power amplifiers with a sensitivity of 0.2V
to 1.7V (please note the 1.7V output level requires an input sensitivity
of 0.3V).
Volume control
The Rega Cursa 3 amplifier volume control utilizes a digitally controlled
analog switched resistor network; with a high performance discrete
FET input circuit being used as the amplifier.
The volume level is controlled via a microprocessor, which in turn
takes its information from the volume digital encoder on the front
panel or remote control handset.
The volume control has a resolution of 1dB per step, giving a total
range of 80 steps over the available gain or volume range of 80dB.
There is a calibrated LED display comprising of 20 LED's, which
indicates the gain level or relative position of the volume control;
this is calibrated in 4dB steps, across the total gain or volume
range. The left and right channels are matched and balanced within
0.2dB, ensuring a centrally placed soundstage no matter what the
volume position or which gain level has been set.
The stepped resistive networks of the volume control are placed
in the feedback and input circuits of the FET input discrete line
amplifier, thereby optimizing the gain of the line amplifier for
the best signal to noise ratio. Also, the stepped resistive network
provides the amplifier input with constant input impedance, providing
the source component (CD, tuner, tape etc) with a constant impedance
load and eliminating the possible changes in sound quality with
different volume control positions
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