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NHB 18NS (update) ... preamplifier ... 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 (12 hrs. aut.) ... small audio signal amplified only passes through 7 silicon junctions from input to output, including the 11 dB full discrete gain stage. For the phono stage, we only add 6 junctions, for a maximum additional boost of 66 dB (77 dB in total) ... No operational amplifier is used in the entire signal path ... No contact or switches or relay of any kind for the selection of the sources. 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 ... new volume control module, which completely 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, using special analog optical couplers controlled by a dedicated processor, providing a dynamic range of 96 dB, through 192 discrete steps of 0.5 dB. There is no use of VCAs or any other active component ... 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 feedback for the output stages. ... MC phono stage input ... All inputs can be Home Theater bypassed (troughout gain of 0 dB). ... Output impedance: 50 ohms for BNC, < 100 ohms for RCA, 600 ohms for XLR ... Bandwidth: 10 Hz to 100 kHz, +0, -0.5 dB. 1 Hz to 1 MHz, +0, -6 dB (XLR: 20 Hz-20 kHz ± 0.5 dB) ... Rise time < 0.8 µs ... THD: < 1% from 7 Hz to 77 kHz ... Temporal distortion - None ... Signal to Noise ratio: Line > 90 dB (A) @ 2 volts RMS output / Phono MM: > 85 dB (A) @ 37 dB gain. MC: > 70 dB (A) @ 60 dB gain.




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NHB 18NS ... Munchen 2014 ... "The new NHB-18NS will start production in about 5-6 weeks from now, with expected availability for next September / October ... final price is still not known but we expect to have a retail price of around Euro 30k (without taxes and duties). ... Old NHB-18NS could be upgraded around 6-8 months after the official new preamp will have started its delivery debuts, say for around next spring 2015."


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