darTZeel NHB-18-NS Brochure

preamplifier
A new approach to preamplification
The darTZeel NHB-18 NS is the logical partner to the now acclaimed NHB-108 model one power amplifier.
In keeping with the very same philosophy, darTZeel uses dedicated circuits reduced to their most basic form. Here again, there is no application of any overall negative feedback. The delicate, small audio signal amplified by the NHB-18 NS only passes through 8 sili­con junctions from input to output, including the 13dB
Leading-edge audio electronics
At this level of performance, every detail is of prime importance.
The delicate, small signal delivered by the sources is amplified by discrete devices, or by means of matched transistors em­bedded in dedi­cated integrated circuits. No operational amplifier is used in the entire sig­nal path. As for the NHB-108, all components used in the NHB-18 NS preamplifier, with no exception whatsoever, are based on the finest products being produced by leading-edge industries at the present moment.
The first aim of the NHB-18 NS is to provide sound re­production quality Never Heard Before.
Instead of offering a preamplifier based on the same approach as that of our competitors, we at darTZeel chose to think differently, offering for the first time in the world what previously seemed impossible:
No contact or switches or relay of any kind for the selection of the sources. This revolutionary feature brings a new level of transparency. Instead of routing the signal through a selector box, each input has its own dedicated gain stage, which is enabled or disabled according to the user’s choice. The signal is then di­rectly routed to the volume control module.
NHB - 18 NS preamplifier zero contact signal path
NHB-18 NS
full discrete gain stage. For the phono stage, we o nly add 3 junctions, for a maximum additional boost of 60 dB (72 dB in total).
The advantages of these new circuits, whose designs are patent pending, are in the same league as the NHB-108 power amplifier: an extreme, pure sound
quality never achieved before
A whole new volume control module, which com- pletely avoids the use of any potentiometer, stepped attenuator or analog switch array in the signal path. The sound signal is attenuated in a fully passive way, within a continuous range of close to 90 dB, in full
nal. As mentioned above, this new design is patent pending. As soon as the patents are confirmed, darTZeel will be pleased to describe in detail how such signal treatment is possible.
The NHB-18 NS is not only new in these aspects. We have also included all the features already imple­mented in our now famous NHB-108 model one, as fol­lows:
Only small local negative feedback at the inputs.
One small, symmetrical, local negative feedback in
the voltage gain stages.
Open loop, free of all negative feedbac k for the out- put stages.
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analog mode, without the use of any VCA or other active com­ponent. Both of these
breakthroughs constitute a big step in the right direction: no harm to the sig-
In addition, the NHB-18 NS features full modular possi­bilities, including future use of multi-amping by using darT to Zeel 50-ohm links. Some key features are (per channel):
5 inputs, whether phono, RCA/BNC or balanced XLR. As standard, the NHB-18 NS is delivered with 2 full floating XLR inputs and 3 RCA/BNC 50 ohm Zeel in­puts.
2 XLR full floating outputs.
Power supply
The darTZeel NHB-18 NS is an authentic dual mono pre­amplifier, from input to output, with separate grounds for left and right channels. Each channel is battery powered by its own battery bank, offering 10 to 12 hours of listening pleasure be­fore a charge is needed.
A very sophisticated, regulated and dedi­cated supply for
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3 BNC 50 ohm darT outputs, ready for tri-amping, with optional built-in passive filters.
1 RCA output.
1 RCA record output (fixed level).
1 dedicated headphones output, with its own amplifi-
cation circuit.
Other configurations are optional upon request.
ensuring the lowest power supply impedance possible. A smart automatic function is provided as standard,
allowing full battery operation when listening, and charging mode being activated when the preamp is
switched off. Hum is gone forever, and there is no
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need to worry about knowing if batter­ies need to be charged or not.
Technical Specifications
Output voltage : 4 volts RMS for RCA and XLR outputs, 2 volts RMS@ 50 ohms (darT outputs) Line gain : 13 dB Input impedance : Line RCA > 100 kohms, from 5 Hz to 200 kHz
Line XLR > 30 kohms, from 20Hz to 40 kHz BNC 50 ± 1 ohms
Output impedance : 50 ohms Bandwidth : 5 Hz to 500 kHz, +0, -1 dB Rise time < 500 ns Slew rate: > 24 V/µs, peak-peak THD: < 1% from 10 Hz to 100 kHz Temporal distortion : None S/N: > 100 dB (A) @ 2 volts RMS output for line inputs. Phono figures not available yet. Pwr consumption : 50 watts for 5 hours (batteries fully empty) when charging, then 5 watts. Dimensions : 440 (W) x 150 (H) x 335 (D) millimeters. Figures not confirmed yet. Weight : Not known yet.
Audio SA. All rights reserved. 2, ch. Louis-Hubert, Geneva, Switzerland. Email: info@dartzeel.com Web: www.dartzeel.com
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