Input impedance - >  50 K Ohms
Output impedance - < 0.2 Ohms Volume on -15 dB  < 40 Ohms Volume on 0 dB
Frequency Response - 10 Hz - 100 kHz +0.1 /-0.1 dB  10 Hz - 200 kHz +1.5/ -0.2 dB
Dynamic range - > 150 dB  Volume at -15 dB
Input level for 0 dB (on modulometer) - Low: 1.0 V rms Volume at 0 dB  High: 2.0 V rms Volume at 0 dB  Studio: 10 V rms Volume at 0 dB
Harmonic Distorsion - See graphics FFT THD+N
(THD + N) - @ 1 kHz, 1 V out, no load on the output
Crosstalk - > -130 dB 1V rms 1 kHz  > -110 dB 1V rms 20 kHz
Tubes - 2 x E88CC New Old Stock  Selected and tested by Nagra
Dimensions - 438 x 396 x 121 mm / 17.3 x 15.6 x 4.8 inches
Weight - 30 kg / 66 lbs preamp and power supply

MER INFORMATION HÄR

Pure Emotion

The Nagra R&D Department, served by ten skilled and specialized audio engineers, worked on this project for the past three years with the goal of creating the most revealing and engaging preamplifier in the world.

The Audio engineers spared no expense or limitation developing electronics, mechanics, power supply and addressing thermal and vibration issues. Each stage of the design also included extensive listening sessions. The result is a striking product in terms of appearance, specification and performance. It will just reshape the expectation you may have of what a preamplifier will add to your whole set-up, sources and amplifiers…

Revolutionary Volume Control
The volume control is a patent pending technology that allows perfect level matching with a much more transparent sound compared to pots and switch resistor technology, because there is no attenuation of the input signal, just an automatic selection of a tap on the Nagra custom output transformer.

"Super Capacitor Power Supply

The newly developed SuperCapacitor power supply is a new technology which combines the very low noise of a battery with the high current capability of the best linear power supplies.

Advanced Mechanical Isolation
The audio engineers created a super vibration free stand to lower the microphonic resonances to a new level.

Tube Nos Circuit
The HDPREAMP has the best specifications ever achieved by any tube preamplifier, 160 dB of signal to noise and 5 Hz to 200kHz frequency response with perfect phase integrity. The impedance input is 50k oHm and the output impedance is 0.2 oHm so you can drive any amplifier on the market.

The HD PREAMP has the best specifications ever achieved by any tube preamplifier, more than 160 dB of signal to noise and 5 Hz to 200kHz frequency response with perfect phase integrity. The impedance input is 50 k Ohm and the output impedance is as low as 0.2 Ohm so you can drive any amplifier on the market.

The HDPREAMP is able to accurately reproduce a square wave at 16 Hz.
And the sound !

The HDPREAMP reproduces music with natural impression, with full spectrum bandwidth and extreme stability.

It also produces a precise 3D holographic soundstage. It is very difficult to express the impact of this design as we didn't think it was possible to achieve such an unbelievable result.

Pure emotion !
Frequency Response