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Rega AETHOS Stereo Amplifier

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Voted "Best Stereo Amplifier Over £2500" - What HiFi  2020

Key Features:

- 125 W RMS both channels are driven into the rated load of 8 Ω
156 W RMS both channels driven into 6 Ω - 
- Strictly Analogue -
- No Dedicated Phonostage -
- No DAC -
- Dedicated Headphone Output - 

Rega AETHOS Stereo Amplifier (In-Depth)

The brand new, highly anticipated, Rega Aethos Stereo Amplifier. With a brand new custom design case, it makes the Aethos look very slick, to us there are some similarities coming from the Rega Osiris but there's absolutely nothing wrong with that as we loved the design of that too. Packing a punch with four 160W 16 Amp output transistors per channel which deliver 156 Watts per channel into 6Ω. The Aethos is a dual-mono design using a custom wound toroidal transformer and regulated supplies for the sensitive amplification and driver stages. When it comes to the pre-amplifier part of the Aethos, it uses class-A, discrete circuity throughout the amp. When Rega started putting the Aethos into production, they built it with one intention in mind, to deliver music as faithfully as possible. There's no doubt in our mind that Rega has built this to the highest standard they possibly could to ensure the listener years upon years of musical excellence.

Rega's Design Innovation

All of Rega's time, effort and money have gone into perfecting the circuity and construction into the Aethos, utilising the highest specification of components throughout. As part of the unique design, Rega has included some useful features such as the switchable direct input and preamplifier output, to enable the new Aethos amplifier to be used in a wide array of custom systems. The headphone socket has been integrated such that the speaker switching is performed by the output mute relay to not obstruct the signal path and completely deteriorate the sound quality given out. This sort of subtle engineering has been embedded around the Aethos in other departments, credit, where it's due, to get an amplifier sounding this good for the price range its set in, is truly remarkable. It's been a long, anticipated wait, but we can safely say it's been worth it.

As stated before, Rega has taken some design concepts from the multi-award-winning and hugely successful Elex-R and Elicit-R and rocketed the performance to another level of excellence and beyond with a 125watt dual-mono design with features such as a fully discrete FET based line amplifier, polypropylene capacitors throughout the signal path, k-Power reservoir capacitors, power amplifier regulated supply and a high current output stage comprising of four 160w Sanken output transistors per channel. I feel like Rega has set the Aethos is a very sweet spot for the market, it will definitely give other manufacturers a run for their money. If you loved the sound and warmth from the other amplifiers Rega have produced, i.e the Elicit, you will feel right at home, but obviously you will be gaining huge sound benefits from upgrading.

The Volume Control and Line Amplifier Technology 

The Aethos uses a high performance combined feedback and passive volume control plus line amplifier, this sort of technology was originally developed for the Rega Elex-R, as you would expect, as time goes on improvements and tweaks have been made, in this case, improvements have been made to the volume control and line amplifier stages in the Aethos with the use of discrete FET input operational amplifiers using the Linear Systems LSK389 FET and the highly spoken about RK23 (known as the 'Blue Velvet') potentiometer As well as keeping tracking irregularities to a minimum, this method also reduces noise and input overload as the control will only ‘use’ the required gain to amplify the signal. This form of volume control is normally only found in professional broadcast environments where accurate low noise control of levels is required.

The Power Amplifier Technology 

Let's get into the real power of this, the power amplifier used in the Aethos is an improved higher power version of the power amplifier that is found in the Elicit-R and Elex-R. The output amplifier used in the Aethos was originated after heavy amounts of extensive research by Rega's very intelligent engineers with the intention to develop a low source impedance emitter follower Class-A driver stage. The technical and sonic improvement gained by the use of low impedance driver is well known, in this case, it features high standing currents in the driver stage when using standard transistor configurations. Due to the nature of the Rega power amplifier circuit we are able to run two complete output stages in parallel, this includes the output transistors, bias network and pre diver transistor this is instead of paralleling just the output transistors as normally found. This ensures the 125-watt output is achieved with complete ease.

Instructions for the Aethos can be found on the following link Aethos Instructions

Who is Rega?

Rega is a specialist hifi manufacturer based in Essex, UK and is renowned for developing and constructing some of the most highly regarded turntables (as well as cartridges and tonearms), electronics and loudspeakers available on the hifi market today. Rega was founded in 1973, and have honed their craft over many years of being a leading brand in every category they put a product to. 


Power outputs at rated 230/115 V supply voltage:

125 W RMS both channels are driven into the rated load of 8 Ω
156 W RMS both channels driven into 6 Ω

Note: Continued high-level use into 6 Ω may cause the case to exceed 40 °C above the ambient temperature and activate the thermal shutdown.

 Headphone output: No-load 12.5 V
32 Ω 2.7 V
54 Ω 4 V
300 Ω 9 V
Source impedance 109 Ω
 Record output: Record output level (with rated input levels) 219 mV
Record output impedance 560 Ω
Pre-amp output:  Pre-amp output level (with rated input levels) 840 mV
Pre-amp output impedance 100 Ω
 Input sensitivities for rated output level: Input 1-5 and record input sensitivity 224 mV @ 17 kΩ
Maximum input level 11.5 V (record output amplifier overload point)
Direct input sensitivity 840 mV @ 50 kΩ
Power amplifier gain 31.6 dB
 Frequency response @ 100 W into 8 Ω: Line input 1-5 and record 10 Hz (-0.8 dB point) to 30 kHz (-0.5 dB point)
Direct input 10 Hz (-0.8 dB point) to 50 kHz (-0.5 dB point)
THD+Noise @ 100 W into 8 Ω:  Direct input (Power amplifier only) Typically 0.007% @ 1kHz (measurement bandwidth 22 Hz to 30 kHz)
Line input   Typically 0.007% @ 1kHz (measurement bandwidth 22Hz to 30KHz)
Power consumption  Maximum output: 415 W @ 230 V / 220 V / 115 V / 100 V into the rated load of 124 W RMS into 8 Ω
Fuse ratings   T3.15 AL 250 V - 230 V/ 50 Hz and 220 V / 60 Hz
T6.3 AL 250 V - 115 V / 60 Hz and 100 V 50/60 Hz
Dimensions  W 433 mm x H 95 mm x D 360 mm (including speaker terminals)
Weight  17.5 kg

Providing your item is in stock, the order is usually dispatched within 24 hours. Postage and packing is completely free for orders over £100*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.


Orders are sent via our couriers' DPD on a next-day-delivery service and usually, take between 1 and 3 days. 


Please use this link to find more detailed delivery information.


*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however, delivery to these locations will incur a charge and can only be sent via a 2-day service.