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DarTZeel NHB-108 Model B Power Amplifier

Quick Overview

DarTZeel NHB-108 B Stereo Power Amplifier.

We consider our products to be musical instruments.

When an exacting musician—do non-exacting musician exist?—visits an instrument maker, technical discussion cannot always be avoided. At the end, the choice will be influenced by those more down-to-earth, we would say, considerations.

The high speed, dual mono power amplifier from darTZeel is not an exception to the rule. Technology matters, and makes a difference. But rather than claiming extravagant virtues which may be more or less verifiable, we much prefer to show you the facts, and only the facts.

Some review:

If you discovered the darTZeel NHB-108 model one for the first time through our web site, it may be helpful to recall some design basics:

* No global Negative Feedback

* Open-loop input and output stages

* No relay, switch, fuse or the like in the whole signal path

* Only 6 transistors per polarity side, from input to output

* One single bipolar-transistor output pair

The five key design elements listed above are of course not exhaustive. But they do reflect the extreme care we put into the concept. We envisioned every detail of the complete design with only one thing in mind as being of paramount importance: All drawings and schematics concerning the darTZeel NHB-108 model one are copyrighted and patent-protected.

The most musical reproduction possible, with the highest fidelity regarding the audio signal.

Manufacturer's website DarTZeel


Please find reviews below:
6 MOONS " Online Magazine Review

STEREOPHILE " Magazine Review , Class A Recommended Component

" SoundStage " Online Magazine Review


Nominal output power:                        100 watts RMS @ 8 (Hi) and 2 (Lo)Ohms .
                                                         160 watts RMS @ 4 (Hi) and 1 (Lo) Ohms.

Gain:                                                  26 dB @ 8 Ohms.

Input impedances:                               RCA: > 100 kOhms, 5 Hz to 200 kHz.
                                                          BNC: 50 ±1 Ohms, 1 Hz to 1 MHz.
Version A:                                           XLR: > 100 kOhms bet. Pin 1 and 2 (hot leg and ground)
Version B:                                           XLR: > 13 kOhms bet. Pin 1 and 3 (cold leg and ground).
                                                          33 kOhms bet. Pin 1 and 2.
                                                          33 kOhms bet. Pin 1 and 3.

Output impedance:                              < 0.33 Ohms, from 20 Hz to 20 kHz (measured @ 8 Ohms).

Frequency response:                            1 Hz to 1 MHz, +0, -6 dB (depends on measurement method).
                                                          10 Hz to 100 kHz, +0, -0.5 dB (depends on measurement method).
                                                          20 Hz to 50 kHz, ±0.5 dB (Version B, XLR inputs).

Rise time:                                            < 0.8 µs.

Slew rate:                                            88 V/ms, peak-peak.

DC voltage output drift:                         Version A: < ±590 mV max.
                                                           Version B : < ±10 mV max.

Total Harmonic Distortion (THD):           <1 % from 7 Hz to 77 kHz

Temporal Distortion:                             None, at any level and load, as specified above.

Crosstalk:                                            <-90 dB from 20Hz to 20kHz.

Signal to noise ratio:                             > 105 dB (A) @ nominal power.

Consumption:                                      150 watts @ idle, up to 1000 watts @ maximum output power.

Size in mm:                                         18 x 14 x 7 (WxDxH). Total depth including handles: 17 in.

Net weight:                                          67 lbs.