As our March '09 Movers & Shakers feature showed, darTZeel partners Herve Deletraz and Serge Roch are nothing if not methodical in their approach to amplifier design. Their goal is to keep the audio path as straight and simple as possible, avoiding input/output switching and even using an optically-coupled rotary encoder for volume rather than a conventional potentiometer.rnOf course, darTZeel does have an eccentric sense of humour, which is why the aforementionedrnknob is referred to as the 'Pleasure Control'. Its NHB-18NS preamplifier has another hefty control called the 'Enjoyment Source', replaced in this integrated amp by a row of ballbearing push buttons for the nine possible inputs. Naturally, these do not 'switch' the inputs by logic or relay but 'enable' them via a series of LDRs (light dependent resistors)...
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