PhD owners manual color
Contents
1. is checking for a continuing musical both green lights will illuminate indicating that the unit signal If a signal is detected power is extended for an iS operating properly Within a fraction of a second additional 30 minutes the Ph D is powered up and stable The red lights indicate that the batteries are running low CONFIGURATION ___________ mms tts Conventional designs use inexpensive low quality Eea computer rocker switches Their design is inadequate for configuring the low level signal from a phono cartridge To offer the user a wide range of configurations while maintaining signal integrity the Ph D incorporates a unique plug in configuration circuit board Each channel of the Ph D has two configuration boards One to select cartridge loading and a second to select gain Each board is square and each side of the square has an associated configuration value Settings are easily adjusted by unplugging the board and rotating it to the desired value This approach gives the highest quality connections with the shortest and most direct signal path The correct orientation that the configuration board is set at is indicated by reading the board when you are facing the front of the Ph D unit It will be the only number that is readable or right Side up 4 A I sensitivity m F control Location of two configuration boards and sensitivity control The Sensitivity Control sets the threshold o2. to reduce the noise level in the established for removing the Ph D s cover musicality of those designs Ph D SPECIFICATIONS and OPTIONS Gain Settings 45 dB 50 dB 55 dB 60 dB Cartridge Loading 100 ohms 200 ohms 1k ohms 47k ohms Noise Noise Less than 150 uV A weighted 47k ohms 50 dB gain Less than 400 uV A weighted 200 ohms 60 dB THD noise Less than 0 02 A weighted Indicators Green Power On Yellow Signal Monitor Red Low Batteries Size 17 wide 4 high 14 deep Weight 38 lbs net with batteries installed 41 Ibs shipping Power Requirements 16 Alkaline D cells Battery Life Greater than 800 hours Sutherland Engineering products like those of AcousTech Electronics are designed by Ron Sutherland for exclusive distribution through Acoustic Sounds Inc PhD nears lech ACOUSTIC SOUNDS E L E C T RO NICS Smart Circuitry 1000 W Elm P O Box 1905 Salina Kansas 67402 785 825 8609 Fax 785 825 0156 www acousticsounds com
3. OWNERS MANUAL Hear the music not the noise YOUR SUTHERLAND Ph D Congratulations You now own the quietest phono preamp you ll ever hear Please take a few minutes to review the specifications setting options and highlights for your easy to operate Sutherland Ph D Although designer Ron Sutherland had already achieved Class A performance with the AcousTech Ph 1 phono preamp he knew there was room to improve while still keeping the manufacturing cost rea sonable In designing the Ph D Sutherland focused on improving the purity of the power source and on lowering the background noise floor Both goals are interrelated An amplifier does not make the input signal bigger Instead it uses the input signal to control the delivery of power from a power supply So the size of the output signal comes entirely from the power supply The quality and purity of the power supply is an essential foundation for creating a high quality output signal Still in many designs the power supply is given only casual consideration Consider that one of the noisiest components in your home stereo is the incoming AC power Even if it were delivered to your home as idealized 60 Hz sine wave it would not stay that way long One of the biggest polluters is the audio power amplifier It does not draw current from the power line evenly There is a large current spike drawn when the sine wave reaches its voltage extremes while at other times c
4. a power manager that monitors for a signal from the turntable or specifically the stylus Once a signal is detected such as anytime the stylus is stimulated by cleaning or contacting a record the Ph D will power up for 30 minutes at which time signal monitoring is inhibited to again avoid any impact on the low noise environment From there the unit automatically looks for a signal every half hour indicated by a yellow light flicker for just a fraction of a second If it doesn t find a signal it will stay on for an additional half hour with a yellow light indicating that it iS preparing to turn off In designing the Ph D Sutherland concentrated on eliminating needless power consumption So as very little power is used very little heat is generated within the components There is essentially no temperature rise and no need for warm up time The design also has very little or no dc voltage across the signal carrying Capacitors so that dielectric forming is not an issue If you do prefer to power up notice we did not say warm up the Ph D before listening simply tap the cartridge headshell or brush the stylus The unit will power up and you ll be set to jam SUTHERLAND r Hear the music not the noise INDICATORS Front panel indicators show the status of the power Every 30 minutes the yellow light will briefly illuminate management circuit When a music signal is detected indicating that the unit
5. f the signal monitor It is set at the midpoint when shipped Supplied loading values Supplied gain values Since there is quite a variance in the output voltage of i sl ae ets phono cartridges some adjustment may be necessary s ae aa es If the Ph D sometimes turns itself on when there is onmis e 47k ohms e 60 dB no musical signal reduce the monitor sensitivity by turning the control clockwise If the Yellow light stays on while music is playing increase the monitor sensitivity by turning the control counterclockwise If you want loading or gain values that are not included in these stock values blank configuration boards and custom configured boards are available NOTE This control does not affect the audio circuit CONSTRUCTION The Ph D is built within a 12 gauge steel case for extreme levels of rigidity and magnetic shielding To maintain signal integrity the Ph D uses a gold plated printed circuit board that provides a lifetime of undiminished performance The physical component design uses a dual mono layout so that each channel sees the same signal path thus enabling subtle gain and phase balance between channels m The Ph D s signal path is built upon experience derived from the Sutherland PH 2000 and the AcousTech PH 1P The rear panel includes inputs outputs and a ground both Stereophile Class A components Refinements lug aS well as the LED indicator guide and instructions were made
6. urrent draw is essentially zero High frequency harmonics and noise are introduced into the same power line used for sensitive phono preamplification There are of course many other factors that contribute to power line distortion and noise While several preamplifier designs have aimed to isolate the AC power line with varying degrees of success ultimate power supply purity cannot be achieved without absolute elimination of the AC power line In the case of the Sutherland Ph D there is no connection to the AC power line at all period Instead the power for the Ph D is 16 alkaline D cells In this application the batteries have a useable lifetime of over 800 listening hours As they age low power supply impedance is maintained by high value storage Capacitance And unlike designs that use rechargeable batteries the Ph D is not compromised and encum bered with battery charging circuitry In fact one of the surprising features of the Ph D is the absence of ANY power connections on the back panel It is totally isolat ed from any outside power noise To bring the sonic advantages of primary battery power into a practical product required the development of a sophisticated power management system If a conventional power switch were used on the Ph D it is almost certain that it would sometimes accidentally be left in the on position thereby draining the battery life much faster than necessary Instead Sutherland designed
Download Pdf Manuals
Related Search