Rega Aura - Phono Preamplifier
The Aura MC phono stage is the culmination of years of electronics design and development.
Aura is a fully adjustable, three-stage, fully symmetrical phono preamplifier designed only to get the best performance from your MC cartridges and vinyl reproduction.
Built without compromise from a completely redesigned cabinet, Aura is specifically dedicated to MC cartridges.
No unnecessary features have been included to avoid compromising the signal path and degrading the sound quality.
Aura phono incorporates an innovative design.
If you are a vinyl enthusiast, Aura MC is the definitive choice.
The Rega Aura is a fully symmetrical three stage preamplifier. The first stage is a complementary symmetrical class A amplifier, using linearly connected, ultra-low noise, parallel FET (Field Effect Transistors) configured as a symmetrical pair input stage. The use of FET transistors ensures that there is no bias current flowing through the cartridge coil so as not to upset the delicate magnetic geometry of the cartridge.
The input circuit configuration also eliminates coupling components between the input stage FET transistors and the cartridge output, which would cause sound degradation. The ultra-low noise complementary FET transistors are carefully selected for optimum performance. This stage drives the passive high-frequency part of the RIAA equalization stage.
The second stage is a symmetrical class A differential amplifier with a common base driver stage, which is also used as an active amplifier in the low frequency part of the RIAA equalization stage. The third stage inverts the signal to provide the balanced output together with the output of the second stage; this third stage uses the same circuit topology as the second stage. The power supply is a discrete symmetrical stage using fast diodes and a low noise voltage reference. Each stage has its own dedicated power supply and LED reference current sources. To maximize headroom, the Aura has a supply voltage that is 60% higher than what you would typically find in a similar preamplifier. The highest quality polypropylene capacitors are used in the signal path. In the RIAA EQ stages the capacitors are 1% tolerance polypropylene, while audio grade capacitors are used in the rest of the circuit. Switching between Gain, Mute and Mono is done using high quality relays.
I earn
NB: Mute the unit or set the volume control to minimum before changing the gain settings. The gain setting switch selects the voltage gain of the phono amplifier. Gain I selects 69.5dB (switch out) and Gain II selects 63.5dB (switch in), giving an input sensitivity of 67µV and 131µV respectively for an output level of 200mV unbalanced and 400mV balanced. The balanced output is actually 6dB louder than the unbalanced output. It is recommended to start with the lower gain setting II and, if necessary, increase to I to suit lower gain cartridges. As the balanced output is actually 6dB louder, it may be advisable to select the gain setting II when using it; this also depends very much on the sensitivity of the amplifier connected.
Capacity
There are five different input capacitance settings: 1000pF, 2000pF, 3200pF, 4300pF and 5700pF. Select the required capacitance as specified by the manufacturer in the cartridge specification. You may want to experiment with different loading conditions as sometimes changing the capacitance will produce a different sonic performance to suit your personal taste; this is true even if the manufacturer does not specify a load capacitance. To match some legacy pre-amplifiers, select 5700pF. The 1000pF setting is optimised for the Rega MC range.
Load settings
There are five different input load settings: 50 Ω, 100 Ω, 150 Ω, 300 Ω and 400 Ω. Select the required load to match the manufacturer’s specifications for the cartridge. You may want to try different load conditions, as sometimes changing the load will give a different sonic performance that is more to your personal taste. To match some legacy pre-amplifiers, select 400 Ω. The 100 Ω setting is optimised for the Rega MC range.
Mute
Allows you to mute the signal when changing gain settings, between tracks, or when changing discs.
Mono
This function allows you to play mono recordings through a stereo head.
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