High quality components are used throughout the circuit. Metal-film resistors are prefered over carbon composition, which have a tendancy to drift with age and produce much higher self-noise. The PM-2C utilises precision Vishay metal-film resistors which are instrumentation-grade, meaning they are extremely quiet, reliable and stable making for an exceptionally transparent and natural sound. All coupling capacitors are polyester dielectric for their high voltage rating, stability and long life. Electroytic bypass capacitors in tube bias circuitry have been replaced with modern ceramic capacitors. If possible use of electrolytic caps is avoided because of their poor figure-of-merit – their initial tolerance is poor and they have a tendancy to dry out, so that their capacitance gradually decreases with age.
Editor’s note: If you are a Phaseomatic owner you might be interested to know that twenty PM-1A units were built in 2002, fifty PM-2A units in 2006, six PM-2B units in 2008 and one-hundred PM-2C units in 2009.