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Kronos AV
Kronos AV

Restek Extract Mono Power Amplifier (Each)
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  • Regular price £2,399.00
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High musicality, excellent ergonomics and timeless modern design

The increased quality of modern program sources also increases the demands on hi-fi amplifiers. A top-class mono power amplifier like the RESTEK EXTRACT not only meets these requirements in measurable peak data, but even more so in its tonal characteristics. The handling of your music system should be as easy as possible with an ordinary light switch. And the device should also meet the highest aesthetic criteria. We have therefore consistently relegated all control elements that are not required every day from the front to the back.

The advantages of mono amplifiers

A mono power amplifier is the ideal case for the spatial distribution of power amplifiers for stereophonic or multi-channel playback. The powerless output signal of the preamplifier is routed into the immediate vicinity of the loudspeakers using symmetrical or asymmetrical connection cables. Only then is the signal amplified with the power amplifier and adapted to the impedance conditions of the loudspeakers. In this way, the supply cables to the speakers can be kept extremely short and the electrical and sound losses can be kept as small as possible. This is particularly important if the impedances of the speakers used fall below a value of approx. 4 ohms.

Crosstalk between the two stereo channels is also completely ruled out due to the spatial separation of the two output stages. This factor should not be underestimated, especially with power output stages!

Some comments on the technology of the RESTEK EXTRACT mono power amplifiers

The circuitry within the power amplifier is divided into four areas:

  • The amplifier stages, i.e. voltage amplifiers (driver stage) and current amplifiers (output stage)
  • Operating and protection electronics to control and manage all functions.
  • Instrument and status displays to inform the user.
  • Power supply for the power supply of the entire device.

The amplifier stages must be designed for sufficient output power, which can mobilize sufficient power reserves at any time even under extreme load conditions. This ensures that the power amplifier is eliminated as a source of possible distortion even during large dynamic peaks. The tonal and metrological quality of the power amplifier is therefore consistently good within the designed performance range.

The output stage works according to the parallel symmetrical principle and has a cascade connection in the input stage which controls eight end transistors via the driver stage. As a result, the RESTEK EXTRACT power amplifier is able to drive loudspeakers up to a minimum impedance of 2 ohms without any problems. It can deliver more than 400 watts.

Optimal ergonomics and timeless modern design

The controls were relegated to the back of the device except for the on / off switch, which also has the advantage that the signal paths in the device can be kept short and thus the susceptibility to interference can be kept low.

In order not to leave the user in the dark about the current status of the power amplifier, the EXTRACT has an informative display field. The large VU meter, whose backlight can be switched off, is particularly striking. This instrument informs the user at any time of the current output voltage. In order to give an indication of the power output, we have scaled the scale for an 8-ohm speaker.

The four LED displays on the front show the operating or operating status of the power amplifier. The standby power supply supplies the switch-on electronics with low internal energy consumption as soon as the device is connected to the mains.

The design of the EXTRACT mono power amplifier fits perfectly with the other devices of the high-quality RESTEK E series .

Features of the EXTRACT power amplifier from the E series

  • Mirror-symmetrical circuit construction
  • Central performance indicator
  • Symmetrical and asymmetrical inputs
  • Overtemperature and offset monitoring
  • Can be switched on remotely via the preamplifier
  • Cold light lighting
  • German manufacturing
  • Sinus power: 180 watts at 8 ohms; 300 watts at 4 ohms
  • Music output: 200 watts at 8 ohms; 350 watts at 4 ohms
  • Frequency response: 5 Hz… 150 kHz at -3dB
  • THD: <0.007%
  • S / N ratio:> 110 dbA
  • Rise time: <2 usec
  • Slew Rate:> 40 V / usec
  • Damping factor:> 250 (8 ohms 1 kHz)
  • Input sensitivity: 2 V rms
  • Input impedance: 47 kOhm asymmetrical, 10 kOhm symmetrical
  • Dimensions (WxHxD): 240 x 155 x 395 mm
  • Weight: approx. 14 kg
  • Housing versions: black
  • Front finishes:
    highly polished acrylic glass, black aluminum, champagne or matt silvery brushed, chrome-plated brass and special designs on request

We are still delivering orders as normal. When your order ships you will still receive tracking details. For UK shipments, Our couriers have procedures in place to ensure deliveries are arriving as quickly & safely as possible. Drivers can now sign for your parcels, however will notify you that they have arrived, in order to ensure you receive your parcel. Signing for the parcel has now been stopped temporally for hygiene reasons. Drivers are also working with customer instructions, so you can ask them to leave the parcel in a safe place (doorstep etc...) if you prefer not to come into direct contact with the driver.

There has been no changes to deliveries with Brexit. All deliveries to the UK mainland, Northern Ireland and the Republic of Ireland are operating as normal. No VAT or charges are applicable. 

Express Deliveries

Express Delivery is FREE on all orders over £50. Express Delivery offers delivery in 24-72 hours from time of purchase. We use premium couriers for this service, mainly DPD & Royal Mail. DPD will offer you a one hour window for delivery to make sure someone is at home, or you can reschedule the delivery if no one is around. 

Standard Deliveries

Here at Kronos AV, we have vast experience with e-commerce sales. Making sure that your parcel arrives undamaged is a huge priority for us. That’s why at Kronos AV, we only use premium couriers for all our orders. All our parcels are shipped with DPD or Royal Mail and are always sent Signed For to make sure it gets to the right person. 

If for any reason your parcel does arrived damaged, please get in touch, and we will be happy to get everything resolved for you. We are always on hand to help!


Delivery is FREE on all orders over £50. In order to offer FREE delivery to UK customers, we use several premium couriers to ensure your delivery arrives safe.

Most large orders (over 2kg) ship using DPD or DHL courier and smaller orders (under 2kg) by Royal Mail signed for services.

The most appropriate courier will be chosen for the items ordered to ensure the quickest possible delivery.

We can offer very generous trade in offers across the majority of our product range. 

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If you have any question, please feel free to call us on 03435236169 or email