Artemis Labs PH-1 User Manual
Contents
1. for the following tubes the Russian 6N1P any high quality 12AX7 ECC83 and the American 5687 tube originally developed by Tung Sol the same manufacturer that developed the 5881 and 6550 The 6N1P is a Russian type widely used by their mili tary N O S New Old Stock of this type is readily available Since this the first amplifying stage noise is critical and selection of the 6N1P for low noise will give about 2 to 3 dB less noise than the average tube Page 6 No _ L No Connection Connection 6 Volts 6 Volts Left Right Cool Swap L No Connection No _ Connection 6 Volts 6 Volts Note the 6N1P does not use Cool Swap technology so both section are always used Any reputable 12AX7 or ECC83 type can be used Current production is widely available and various N O S types are still available although rather expensive The 5687 tube is no longer manufactured but large N O S quantities are still available The 5687 was used in industrial and military equipment and as a result nearly all tubes available are built to higher quality and reliability standards than tubes for consumer equipment The 5687WA and 5687WB are later versions with tighter control of their characteristics Although not identical in characteristics to the 5687 the fol lowing tubes can also be used in the PH 1 in place of the 5687 6900 7044 7119 and E182CC If you try these listen carefully to2. the sound and only use the types that sound the best The PH 1 was optimized for the 5687 however Warning Do not use any other types of dual triodes than those recommended here The pin connections of all other dual triodes are different and damage to both the tube and the PH 1 will occur if used Artemis Labs is not responsible for damage caused by using incorrect tubes The tube shields can be removed by gently rotating counter clockwise until they pop up and are replaced by pushing down and gently turning clockwise The tube shields are needed to reduce hum pick up TECHNICAL v2 1 2 12AX7 FEATURES 160V Power Supply Right unregulated Outputs Features Electrostatically shielded transformer High speed rectifiers High temperature 105 C electrolytics Line voltages available 100V 110V 120V 220V 230V 240V 50 or 60Hz vi TexTool ZIF Socket for RorC loading 5 8 4 DN 64 v2 v3 va v5 5 5 5 5 8 8 8 4 4 4 4 40 second Delay Artemis Labs PH 1 Phono Preamp Simplified Schematic Left Outputs 163V reference rev 1 1 12 31 05 Muting relay control Low noise first preamp stage with battery bias With typical signals at the microvolt level the first amplifier stage is extremely critical Parts are chosen carefully for low noise and minimum low
3. tors This allows the preamp outputs to drive another device in addition to the line amp or power amp The Input Cover is attached by three thumb screws A Philips screwdriver may be needed to loosen the screws if they are tight Under the cover are the two bias batteries and the ZIF socket that holds the optional input load Page 4 REAR PANEL resistors It is recommended that the phono inputs be disconnected when the input cover is removed The Bias Batteries supply a fixed grid bias to the 6N1P input tube No current is drawn from them so the bat teries will last as long as their shelf life typically five years or more Replace the batteries if they measure 1 4 volts or less Symptoms of weak batteries are distortion and the 6N1P running hotter than normal Replace only with type N or AM 5 1 5 volt alkaline batteries Make sure that the batteries are installed with the end with the bump upwards ZIF Socket Right Input Bias Batteries Left Input Input Loading Resistors optional Many high output phono cartridges are designed for a 47K load resistance This resistance actually 47 5K is hard wired across the inputs of the PH 1 Some cartridges especially moving coil types run best with lower loading resistance and may even need extra loading capacitance The 3M TexTool ZIF Zero Insertion Force Socket originally designed for the semiconductor industry provides a convenient way to attach additiona
4. Artemis Labs DH 1 Phono Preamp for High Output Cartidges Operating Manual Important Safety Instructions Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water ae ae ee Clean only with a dry cloth 7 Do not block any ventilation openings Install in accordance with the manufacturer s instruc tions 8 Do not install near any heat sources such as radiators heat registers stoves or other appa ratus including amplifiers 9 Do not defeat the safety purpose of the grounding type plug A grounding type plug has two blades and a third grounding prong The third prong is provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Unplug this apparatus during lightning storms or when unused for long periods of time 13 Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as if the power supply cord or plug is damaged liquid has been spilled inside the appliance or it has been exposed to moisture the appliance does not operate normally or has been dropped 14 WA
5. RNING To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture Explanation of Safety Symbols CAUTION To reduce the risk of elec CAUTION ATTENTION tric shock do not remove the covers No user serviceable parts inside RISK OF ELECTRIC SHOCK RISQUE DE CHOC ELECTRIQUE PRA cies a DO NOT OPEN NE PAS OUVRIR Refer Servicing to qualified service personnel This symbol is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of elec tric shock to persons This symbol is intended to alert the user to the presence of important operating and maintenance servicing instruction in the literature accompanying the appliance Page 2 INTRODUCTION amp SPECIFICATIONS The Artemis Labs PH 1 Phono preamplifier is specifically designed for medium to high output phono cartridges It combines the clean accurate sound of a purist phono preamplifier with the con venience and reliability of a solid well built product Special care is taken with all parts in the audio path All aspects of the design were done by John Atwood of One Electron The PH 1 is conservatively designed and is built to last for many years The only maintenance needed is the occasional replacement of tubes and even this has been reduced by the use of Cool Swap technology Please read this entire user s manual
6. ap configuration one tube is used for each channel each with one half heated The right channel uses triode 1 and the left channel uses triode 2 Since the main failure mode in modern tubes is cathode wear out the unused triode in each tube is essentially a spare By swapping the two tubes the unused spare is brought into use Thus Cool Swap effectively dou bles tube life and since only half the tube is heated the tube runs cooler an important factor in the normally hot running 5687 A side benefit is reduced cross talk between channels since each channel has its own tube One effect of the Cool Swap technology is that only one half of each tube will be lit up This is normal in the PH 1 How often you have to swap tubes or replace them with new tubes if already swapped depends on how you use the PH 1 The tubes supplied with the PH 1 should last several thousand hours of active use Signs that the tubes are weak include less gain than usual a flabby sound excess noise and a weak reading on a tube tester Since the PH 1 uses a soft heater turn on and delayed application of high voltage tube lifetime is not degraded by power cycling Thus it is recommended that the PH 1 not be left on all the time but only be turned on when needed with perhaps a one half hour warm up time if desired Tube Types The tube manufacturer and tube type will have an effect on the sound of audio equipment The PH 1 was designed
7. fied technician www aydn com Tel 1 818 216 7882 email info aydn com rev 1 1 12 05
8. l shunt resistors or capacitors When the lever is flipped out the socket apertures open up The components are then inserted Flipping the lever back towards the chassis firmly clamps the component leads The gold plated socket blades provide a high quality reliable electrical connection Any resistance attached to the ZIF socket is in parallel with the internal 47 5K resistance To calculate the resis tance needed to achieve a given load the following equation can be used R REQUIRED X 47 5K R syunt 47 5K R REQUIRED As shown on the simplified schematic on page 7 the top three positions of the ZIF socket are available for the right channel and the bottom three positions are for the left channel The middle position is not used example A 10K shunt is required 10K x 47 5K l l l l 47 5K 10K If the required shunt resistance is lower than 47K start with the age value recommended by the cartridge manufacturer You then 266K experiment with lower values tending to flatten the high fre ahs A 12 7K 1 film resistor would work well quency response at the expense of output voltage R sHunT Page 5 TUBES The PH 1 uses Cool Swap technology to let the tubes run cooler and provide a built in spare Many dual triodes including the 5687 and 12AX7 have split heaters allowing them to run from either 6 3V or 12 6V This heater set up allows only one of the two triodes to be heated In the Cool sw
9. level nonlinearities To get around the problems of cath ode biasing and the typical electrolytic capacitor fixed bias using a single N alkaline cell is employed Being in the grid path virtually no current is drawn letting the battery last for many years Unlike circuits where the battery is in the cathode any imperfections or nonlinearities in the battery are not manifested by the tube s current flow The plate supply for the first stage is filtered by an R C filter using a 15uF polypropylene capacitor This insures minimum noise without the sonic degrada tion of electrolytic capacitors Extended high frequency response Many phono preamps response drops quickly above 20KHz The PH 1 maintains its RIAA equalization to above 40KHz important for high resolution playback systems and for use with 96KHz digital systems Passive RIAA equalization using hand selected capacitors By using passive equalization the problems of feed back equalization are eliminated slew rate dis tortion deviation of equalization curves at high Muting amp Output 4 second Delay Power Supply amp Time Delays Low Gain Regulation frequencies and instability problems To permit flat equalization to within 0 2dB the capacitors in the equalization network are pairs that are hand selected on a precision impedance bridge to better than 0 5 accuracy Two stage output stage with modest feedback About 5dB of feedback is u
10. rts the audio outputs until about 4 seconds after the high voltage is applied This allows start up transients to die away No troublesome integrated circuits All time delay and regulation circuits use time proven simple discrete semiconductor devices Critical audio circuits point to point wired with military style terminal boards Conventional fiber glass PC boards are used for the power supply and for the rear panel jacks and switching All critical circuits in the audio path use point to point wiring on military style terminal boards using silver plated turrets This technique minimizes the sonic effects of PC boards and allows easy component replacement High quality high temperature capacitors All electrolytic capacitors are high quality 105 C rated Panasonic types for best reliability All film capacitors in the signal path are either polypropyl ene or silvered mica types High speed rectifiers and electrostatically shielded power transformer Power supply noise is kept to a minimum by the use of a custom power transformer with electrostatic shielding between the primary and secondaries High speed rectifiers are used for both the plate and heater supplies Available mains voltages wired at factory 100V 110V 120V 220V 230V 240V 50 or 60Hz Virtually all the power systems of the world can be accommodated by the PH 1 transformer connec tions These are set at the factory or can be re wired by a quali
11. sed across the two stage output amplifier This stabilizes the gain and makes the frequency response less sensitive to loading The inherent distortion of the 12AX7 and 5687 with choke loading is already very low so the high order harmonics that can be generated by excessive feed back are minimal Strong triode output driver with choke loading The output stage in the PH 1 uses the 5687 triode This tube has excellent linearity Its low plate resis tance allows it to drive heavy loads without the use of a cathode follower stage The use of an inductor choke load instead of a conventional plate resistor offers several significant advantages to the PH 1 design A good quality audio choke is essentially a perfect current source allowing the triode to operate into an infinite resis tance load giving the lowest distortion Unlike Page 7 semiconductor constant current devices an induc tor is an energy storage device This allows the plate voltage to swing 100 above the B plate supply voltage doubling the head room and allowing a lower B supply voltage to be used reducing power consumption This large headroom permits output of over 40 volts rms before clipping The PH 1 uses custom made audio chokes using grain oriented laminations Can drive 12K ohm aggregate or higher loads Despite the lack of a cathode follower output stage the PH 1 can drive loads as low as 12K while still meeting specifications This is importan
12. so that you can understand all the features and get the most from the PH 1 The Warranty is on a separate card Read it and send it in to get full war ranty coverage SPECIFICATIONS Mid Band Gain 47K load 1KHz 52dB 2dB Frequency Response amp Distortion measured with inverse RIAA curve applied to generator Worst case Loading 12K ohms 1000pF Frequency Response 25Hz 30KHz 0 5dB THD N at 1KHz 2Vrms output lt 0 2 Average Loading 47K ohms 250pF Frequency Response lt 10Hz 42KHz 0 5dB THD N at 1KHz 2Vrms output lt 0 2 Maximum output voltage 47K load 1KHz 0 5 THD 40Vrms Output Noise grounded input 47K load rms detector 22Hz 30KHz lt 59dB below 2Vrms output A weighted lt 69dB below 2Vrms output Crosstalk 1KHz lt TBDdB 20KHz lt TBDdB Effective Output Impedance approx 1300 ohms 1KHz Input Impedance 47 5K ohms lower with optional shunt resistors Mains Voltage Wired at factory for one of the following voltages 100 110 120 220 230 240V 50 to 60Hz Power Consumption rms 40 Watts nominal 49 Watts maximum Size 6 Y 165 mm Height 8 216 mm Width 14 Ys 371 mm Depth Mass 24 lbs 11Kg Note These specifications are subject to change at any time Page 3 FRONT amp REAR PANEL FRONT PANEL The Power Switch applies power when flipped up The Power Indicator will glow red while the tubes warm up then after approximatel
13. t when driving certain sound cards or pro audio equipment which can have input impedances as low as 12 or 15K ohms Each channel individually voltage regulated Each channel has its own MOSFET source follower low gain regulator This insures there is no coupling between the two channels through the power supply The source follower regulator gives good regulation without the transistor sound typical of high gain regulators using op amps Protection resistors and diodes help prevent burn out of the MOSFETs True voltage regulation minimizes noises and changed operating conditions due to power line shifts Since the impedance of the power supply as seen by the amplifier is low and flat the bass response is even and solid DC heater supply A well filtered DC heater supply helps keep hum low and allows the use of tubes that would other wise have too much hum in AC heated systems Delayed high voltage with delayed muting relay The high voltage plate supply is applied to the tubes after a delay of about 40 seconds This gives the tubes ample chance to warm up without the chance Artemis Labs products are distributed by Page 8 AYDN Vacuum Tube Audio 679 Easy Street Unit E Simi Valley California 93065 USA of cathode stripping degradation of the cath ode by bombardment by positive ions before it is hot enough to build up a protective space charge around the cathode This helps extend tube life A muting relay sho
14. y 40 seconds will glow green About 4 second after that a faint click will be heard indi cating the muting relay turning off The PH 1 is now ready for use If the power is removed even briefly then restored the warm up time delay process will start over again REAR PANEL Voltage Rating Fuse IEC Power Ground Connector Terminal Right Input Right Outputs Left Input Left Outputs Input Cover Outputs 1 and 2 Make sure that the Voltage Rating of your PH 1 matches the power mains voltage at your location The voltage can be changed by internal rewiring which can be done by Artemis Labs or by a qualified technician The Fuse isa 1 x 144 3AG Slow blow type Its value is given on the Voltage Rating sticker A power cord is supplied with each unit If the mains plug does not match your socket contact your dealer to exchange it for the correct type The power cord plugs into the IEC Power Connector If the power cord is frayed or damaged replace it with a new one Use only power cords that meet the safety standards of your loca tion The Ground Terminal is used to connect the chassis of the PH 1 to the turntable and other equipment in your system to help minimize hum and noise Experiment with different connections for the best results The phono cartridge connects to the preamp through the Right and Left Inputs There are two pairs of outputs Outputs 1 and 2 These are essentially in parallel separated by low value resis
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