Rega AOS Moving Coil Phono Stage

Pure Analogue Architecture

The Rega AOS is a uncompromising, two-stage "all-analogue" pre-amplifier, entirely free from digital control circuitry. By eliminating unnecessary components that could degrade the signal path, Rega engineers have achieved a remarkably low noise floor and class-leading transparency. The precision-machined aluminium chassis acts as a total shield, protecting the delicate internal circuitry from stray RFI (Radio Frequency Interference).

Innovations in Stability

A standout feature of the AOS is its self-adjusting servo control. This innovative circuit automatically compensates for variations in ambient or operating temperature, ensuring that the phono stage maintains its optimum performance and sonic character from the moment you drop the needle until the end of your listening session.

High-Performance Input Stage

The AOS utilises parallel-connected, ultra-low-noise Field Effect Transistors (FETs) configured as a compound pair. By using FETs, Rega ensures that no bias current flows back into the cartridge coil. This protects the delicate magnetic geometry of your Moving Coil cartridge, allowing it to track and perform exactly as intended.

The Two-Stage Design

First Stage: Symmetrical Class A

• The first stage is a symmetrical, complementary Class A amplifier featuring Linear Systems ultra-low-noise FETs.
• Direct Signal Path: The input configuration eliminates the need for coupling components between the cartridge and the input stage, removing potential barriers to sound quality.
• Matched Precision: Every FET is carefully graded and matched to guarantee optimum performance. This stage is responsible for driving the passive high-frequency portion of the RIAA equalisation.

Second Stage: Differential Class A

The second stage utilises a symmetrical, Class A differential amplifier with a common base driver stage.

• Active RIAA Equalisation: This stage acts as the active amplifier for the low-frequency portion of the RIAA equalisation curve.
• Scale & Composure: This dual-stage approach ensures world-class accuracy across the entire frequency spectrum, delivering the "scale and grip" Rega is famous for.

Customisable Loading & Control

To ensure a perfect match with any high-quality Moving Coil cartridge, the AOS provides extensive rear-panel adjustability:

• Resistive Loading: Selectable from 70 Ω to 400 Ω.
• Capacitive Loading: Selectable from 1000 pF to 4300 pF.
• Gain Sensitivity: A 6 dB gain adjustment switch on the back panel allows you to match the output to the rest of your system.
• Smart Power: An Automatic Standby feature puts the unit to sleep during inactivity. For those who prefer the unit to remain "always on," this can be easily deactivated via rear-panel dip switches.

We endeavour to despatch same day for orders placed up to 1pm on available stock items (items with stock message "Usually dispatched within 24 hours"). Please remember to check with us first for a physical stock check if next day delivery is important to you. Any items with stock message "Usually dispatched within 72 hours" are items that we do not hold in stock but order in from the importer or manufacturer as soon as a customer order is received. Occasionally these may be delayed beyond 72 hours due to importer/manufacturer stock levels but we will inform you as soon as we can if this is the case.

UK Orders

We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge. Non Mainland locations - Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer and are not Free of Charge. Smaller items are delivered using Royal Mail 24 or special delivery. Larger items are delivered using a courier service such as DPD or UPS.

International Orders

Due to the nature of our products and brand restrictions we are only able to send certain items internationally. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Hifisound or by the courier with a request for any further information required. Customs duties can apply for shipments to any countries outside of the UK depending on where the product you have bought is made. Customers are responsible for all taxes and duties incurred when the items enter their country.

Collect in Store or Home Install

At the request of the manufacturer some items cannot be supplied by mail order but you can click and buy them and then elect to collect them from our store or arrange a home install (if applicable). Applicable items clearly state that they are Collect in store or home install. Once ordered you will receive a message prompting you to contact us by phone or email to arrange for us to deliver and install or to reserve and collect from our store at your convenience, you will also be advised of the delivery time / stock availability as not all Home install / collect in store items are held in stock.