P-5 Preamplifier

P-5 Preamplifier

The first MOON preamplifier that was heralded as state-of-the-art component.

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Launched in 1998, Discontinued in 2005

The MOON P-5 Preamplifie represented a full out assault on state-of-the-art design. It featured a separate power supply, dual-mono fully balanced differential class "A" circuit topology, an exceptionally short capacitor-free signal path using a discrete "shunt to ground" gain stage and full function remote capability.

User manual

Technical aspects

An oversized outboard power supply housed in a separate matching chassis
8 stages of DC voltage regulation 
An exceptionally short signal path measuring only 9 inches in length from the rear panel's input to
output connectors, yielding a much faster transient response
Fully balanced circuitry throught the entire preamplifier
Open loop zero feedback circuit topology using absolutely no capacitors anywhere in the audio
signal path
Proprietary designed fully discrete "shunt to ground" gain stage employing a precision relay
network which uses only one metal film resistor at any given time (rather than a series of
resistors), for the audio signal to pass through, resulting in a gain control that doesn't
degrade sonic performance regardless of the selected setting
J-FET input devices and MOSFET output devices
A custom proprietary toroidal transformer design with lower magnetic, electrical and thermal loss,
yielding an improved power transfer and lower regulation factor, resulting in increased current
speed and better dynamics
One single-ended audio input which bypasses the gain stage to accommodate a component, such as a home-theatre processor, whose own volume control is used instead
Accurate matching of the very finest high quality electronic components
A symmetrical circuit design
Pure copper circuit board tracings with extremely low impedance characteristics
Extremely rigid chassis construction to minimize the effects of external vibrations
Improved reliability through the elimination of moving parts
Designed to be powered up at all times for optimal performance
Low operating temperature for a longer than normal life expectancy.

Magazine reviews

 The Absolute Sound   (USA)  Anna Logg  Issue 131 - 2001
 Alta Fidelidad   (Spain)  Staff  No. 138 - Nov. 2002
 Audio Accessory   (Japan)  Staff  Autumn 1997
 Audio Music   (Russia)  Staff  3/2001
 Audiophile   (Hong Kong)  Staff  November 2000
 The Audiophile Voice   (USA)  Les Turoczi  Vol. 4 No. 6
 Haute Fidelité   (France)  Zacharie Bourjet  November 2002
 HI-FI Journal   (Russia)  Staff  # 4 (33)   2000
 hi-fi+   (United Kingdom)  Roy Gregory  June/July 2000   #7
 HiFi Review   (Hong Kong)  Staff  November 2000   #174
 hxos   (Greece)  Christos Tsiatis  October 2001   #343
 The Inner Ear Report   (Canada)  Ernie Fisher  1997 - Vol. 10 #1   (www)
 International Audio Review   (USA)  Peter Moncrieff  January 1999   #80   (www)
 Journey To Sound (Hong Kong)  Die Walkure  September 2000
 Positive Feedback   (USA)  David Robinson  1999 - Vol. 8, #2
 SoundStage!   (www)  Doug Schneider  December 1999   (www)
 Stereo & Video   (Russia)  Artjom Avatinjan  March 2001
 Stereophile   (USA)  Kalman Rubinson  July 2002 Follow-Up   (www)
 Stereophile   (USA)  Kalman Rubinson  March 1999   (www)
 StereoSound   (Japan)  Staff  1997 - #123
 UHF Magazine   (Canada)  Gerard Rejskind  Vol. 50 - 1997
 YoHiFi   (China)  Samuel  March 2001
 YoHiFi   (China)  James Chung  December 2000