Aura Reference Moving Coil Preamplifier
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威達影音頻道 (Radar Audio YouTube Channel) |
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HiFi音響 (HiFi Review) Vol.432 2022年6月號 |
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HiFi 音響 (HiFi Review) No.393 |
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胆機世界 (The Tube World) Nov 2018 |
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發燒音響 (Audiophile) Nov 2018 |
Introduction and Design Innovation
The Rega Aura is a three stage, all symmetrical pre-amplifier. The first stage is a symmetrical, complementary class A amplifier, using parallel connected Linear Systems ultra-low noise FET (Field Effect Transistor) transistors configured as a symmetrical compound pair input stage. The use of FET transistors ensures there is no bias current flowing in the cartridge coil so as not to upset the delicate magnetic geometry of the cartridge. The input circuit configuration also alleviates the use of any coupling components between the cartridge output and the input stage FET transistors, which would degrade the sound. The complementary ultra-low noise FET transistors are carefully graded and matched for optimum performance. This stage drives the passive high frequency part of the RIAA equalisation stage.
The second stage is a symmetrical, class A, differential amplifier with a common base driver stage; this is also used as the active amplifier in the low frequency part of the RIAA equalisation stage. The third stage inverts the signal to provide the balanced output along with the output of the second stage; the third stage uses the same circuit topology as used in the second stage. The power supply is a symmetrical, discrete tracking power supply using fast diodes and a low noise voltage reference. Each stage has its own localised power supply and LED referenced current generators. To maximise headroom, the Aura has a power supply voltage, which is 60% higher than normally found in such a pre-amplifier. Very high quality, polypropylene capacitors have been used in the signal path. 1% tolerance polypropylene capacitors are used in the RIAA EQ stages and audio grade capacitors are used in the rest of the circuit. Gain, Mute and Mono switching is implemented using high quality relays.
Gain
Please note: mute or turn the volume control to minimum when changing the gain setting. The gain setting switch selects the voltage gain of the phono amplifier. Gain I selects 69.5 dB (switch out) and Gain II selects 63.5 dB (switch in); this will provide an input sensitivity of 67 μV and 131 μV respectively for an output level of 200 mV unbalanced and 400 mV balanced. The balanced output is effectively 6 dB higher than the unbalanced output. It is advisable to start with the lower gain setting II and if necessary, increase the gain level to I if more level is required for lower output cartridges. Because the balanced output is effectively 6 dB higher, it could be advisable to select gain II setting when using the balanced output; this will also depend greatly on the sensitivity of the connected amplifier.
Capacitance
There are five different input capacitance settings of 1000 pF, 2000 pF, 3200 pF, 4300 pF & 5700 pF. Select the required capacitance to match to that specified by the manufacturer in the cartridge specifications. It is permissible to try different loading conditions as sometimes changing the capacitance gives a different sonic performance more suited to your personal taste; this also applies if there is no loading capacitance specified by the manufacturer. To match some ‘legacy’ pre-amplifiers, select 5700 pF. The 1000 pF setting is optimised for the Rega range of MC cartridges.
Load Settings
There are five different input load settings of 50 Ω, 100 Ω, 150 Ω, 300 Ω & 400 Ω. Select the required load to match to that specified by the manufacturer in the cartridge specifications. It is permissible to try different loading conditions as sometimes changing the load gives a different sonic performance more suited to your personal taste. To match some ‘legacy’ pre-amplifiers, select 400 Ω. The 100 Ω setting is optimised for the Rega range of MC cartridges.
Specifications:
Input Sensitivity for 200 mV on Unbalanced Output- 67 μV - 69.5 dB Gain Setting I
- 131 μV - 63.5 dB Gain Setting II
Gain Input to Unbalanced Output:
- 63.5 dB
- 69.5 dB
Input Load:
- 50, 100, 150, 300 & 400 Ω
Capacitive Load:
- 1000, 2000, 3200, 4300, 5700 pF
Input Overload @ 1 kHz:
- 9.6 mV - 63.5 dB Gain Setting
- 4.9 mV - 69.5 dB Gain Setting
Rated Output Level:
- Unbalanced 200 mV
- Balanced 400 mVUnbalanced 14.5 V RMS
- Balanced 29 V RMS
- Balanced Output Connections
- Balanced XLR connectors pin2 positive and pin3 negative.
- The positive pin2 connection on the balanced output is the same connection as the unbalanced output.
Output Resistance:
- Unbalanced 100 Ω
- Balanced 200 Ω
Absolute Minimum Output Load Resistance (for a –3 dB roll off @ 20 Hz):
- 500 Ω Unbalanced, 1000 Ω Unbalanced
- RIAA Accuracy (Better Than): 0.2 dB 100 Hz to 50 kHz
- Frequency Response: 13.5 Hz (–3 dB) to 100 kHz (–0.2 dB)
THD:
- Typically 0.03 % @ 1 V 20 Hz 20 kHz (Bandwidth 100 Hz to 22 kHz)
Output Noise Level (Unbalanced Output, A-Weighted and 15 Ω Input Load)
- 77 dB V (69.5 dB Gain Setting I)
- 82 dB V (63.5 dB Gain Setting II)
Weight:
- 13Kg
Dimensions (H x W x D):
- 435mm x 350mm x 88mm