Kronos AV
Kronos AV
The idea behind OCTAVE is a passion for music combined with ingenious electronic attitude and an absolute commitment to perfection. The technically innovative, perfectly manufactured, completely safe and user-friendly amplifiers that offer elegant aesthetics while allowing the beauty of the music and its authentic sound to come alive in living rooms.
What distinguishes OCTAVE? The conviction that true musicality in high fidelity can only be realized with tubes? Surely. But that‘s not the sole factor. The secret of our success lies in the OCTAVE hybrid technology. By that, we mean the optimal synthesis of traditional tube technology and innovative semiconductor circuitry. Tubes ensure the remarkable sound performance of our amplifiers, while our innovative transistor circuits play an important part in enabling the tubes to completely maximize their audiophile potential. 

Octave HP 300 SE Pre Amplifier
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  • Regular price £6,445.00
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Octave HP 300 SE Pre Amplifier

The HP 300 SE is a enhanced version of the HP 300 MKII. The HP 300 SE does not replace the HP 300 MKII, this model extends our range of Preamps. The HP 300 SE offers more flexibility in the connections and sonic benefits due to some improvements in the Power Supply and the Output stage of the Line Amplifier. The HP 300 SE has two independent XLR Inputs, three RCA Inputs, one Monitor Output, two RCA Outputs and one XLR Output. The Gain is switchable in three steps, this allow to set the optimum Gain and regulation Ratio depending on the efficiency of the Loudspeaker. The new designed Line Amp has a extremely high Signal to Noise Ratio. Noise is not only a characteristic of the tubes, a significant contribution is coming from the mains, respectively the Power supply design of a Preamp. The Power supply of the HP 300 SE consists of the external transformer with optimized isolation characteristic, and the precise ultra low noise Voltage regulators of the main unit. Both systems are match to each and help reducing the Noise of the Lime Amplifier effectively. The Balanced Output is realized with a highly symmetrical Output Transformer. The Transformer offers the possibility to connect or disconnect the Ground connection to the Power Amplifier. The feature helps to reduce disturbing mains induced currents that usually flow in the Ground of the Signal connection. Both Outputs offer very low Output Resistances. Connecting cables up to 5 - 10 meter is without negative influence. A helpful feature in modern Hifi combinations is the Home Theatre Bypass Function. The HP 300 SE offers this feature, with the additional possibility to select the Bypass Input from a RCA Input to a XLR Input. The Monitor Output is buffered and can be used to drive an external headphone Amp, the Analog Input of a Computer or similar. Phono MC is available optional.

Technical Data

Gain high 25 dB = 18,5
Gain med 19 dB = 8,8
Gain low 12 dB = 4
Frequency Response Gain high 10 Hz - 200 kHz - 1,5 dB
Total Harmonic Distortion Gain high 0.03%
S / N Ratio : Gain high - 92 dB
S / N Ratio Gain low -108 dB
Left/Right Crosstalk 90 dB 1 kHz
Input to Input Crosstalk 100 dB 1 kHz
Input Impedance 100 kOhm
Output Impedance 50 Ohm cinch; 150 Ohm XLR
Channel Balance 0.5 dB - 70 dB
Connections Inputs : 3 x Cinch, 2 x XLR, 1 x Phono Option Outputs : 2 x Cinch, 1 x XLR, 1 x Monitor
Features HT Bypass, Sym. Inputs and Outputs, Monitor Out

RIAA-Equalization Accuracy 0,3 dB 15 Hz - 20 kHz
Corner Frequency Subsonic Filter 20 Hz / - 3 dB
Input Impedance 40 - 1000 Ohm
Input Sensitivity 0.1 mV / 0.5 mV
Gain low 58 dB
Gain high 67 dB
Signal-to-Noise Ratio (weighted) - 75 dB
Power Consumption 35 W
Weight with Power Supply 12 kg
Standard Accessories Power cord, IR-Remote Control
Dimensions W x H x D = 438 x 77 x 410 mm
Dimensions Power Supply W x H x D = 110 x 80 x 250 mm

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.

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