NHB-18NS preamplifier User Manual (Pre-release)
darTZeel NHB-18NS User Manual, version 0.
Table of contents 1. Introduction .......................................................................................................4 2. Brief description ................................................................................................4 3. The NHB-18NS in details...................................................................................5 3.1. FRONT PANEL.......................................................................................................... 5 3.2.
darTZeel NHB-18NS User Manual 1. Introduction Congratulations for purchasing a darTZeel NHB-18NS. Our machines are designed and hand built for very long lasting use and musical pleasure. The darTZeel NHB-18NS is a highly unusual preamplifier, and requires special care. We strongly recommend you read this manual in its entirety, in order not to miss any reason for enjoying your machine at its very best! In order to facilitate packing/unpacking operation, please go to our web site www.darTZeel.
3. The NHB-18NS in details 3.1. FRONT PANEL 1. 2. 3. 4. Power Nose Enjoyment Source Pleasure Control Balance Control 5. Mute / HT Bypass 6. Mono-Stereo / Dimmer 7. Identity Plate 3.2. REAR PANEL 1. 2. 3. 4. 5. darTZeel NHB-18NS Phono Input Line RCA / Zeel Input Line RCA / Zeel Inputs Line XLR Input Line XLR Output 6. 7. 8. 9. Line RCA Output Line darT Outputs Line RCA Fixed Output Power Supply / Trigger Outputs User Manual, version 0.
3.3. Connecting the NHB-18NS First connect the external power supply’s umbilical cord to the power connector located on the Rear Panel (Chapter 3.2. fig 9). Then connect the AC cord into your wall socket. Phono input: Use inputs I (Chapter 3.2. pos. 1). You can either connect the ground wire to left or right channel. The toggle switch allows choosing phono ground path between signal ground, AC earth, or floating. Default position is Gnd (right).
3.5. Special features Home Theater Bypass: If you hold the mute toggle switch (Chapter 3.1. pos. 5) for about 7 seconds, the Mute LED will go green, indicating that the corresponding input is now in HT bypass mode. The pleasure control is now defeated, and the global In-to-Out gain is set at 0 dB. The setting will be kept in memory until the Mute toggle will be hold again for 7 seconds. Each input can be HT bypassed separately if needed.
3.6. LED Status The 3 LEDs inform you about almost everything you would need to know.
4. Technical data (subject to change) darTZeel NHB-18NS preamplifier Gain : Line 11 dB Phono 30 to 66 dB (up to 77dB gain at output) Frequency response : Rise time : < 0.8 µs. Slew rate : > 88 V/µs, peak-peak. Total Harmonic Distortion (THD) : < 1 % from 7 Hz to 77 kHz Temporal Distortion : Crosstalk : < -90 dB from 20Hz to 20kHz. Signal to noise ratio : > 92 dB (A), line; > 70 dB (A), phono w/factory settings. Consumption : 7-70 watts, depending on working mode.
54 57 30 33 63 39 66 42 Gain when MC set Gain when MM set ONLY ONE SOLDERED PAD AT A TIME Resistors can be paralleled: 1k and 510 both soldered give 338Ω GAIN in dB 60 36 For MM MM, 1nF must be unsoldered !!! 510 100 Soldered Pad = Set 1k LOAD in Ohms/nF Unsoldered Pad = 47kΩ Soldered Pad = Set 1nF 5k1 Unsoldered Pad Soldered = MC Unsoldered = MM Cartridge Type MM /MC
