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L3 Phono Stage V2

Construction Manual

Version 2.00, June 2019

1-613-822-7188

Содержание L3 Phono Stage V2

Страница 1: ...L3 Phono Stage V2 Construction Manual Version 2 00 June 2019 audionotekits rogers com 1 613 822 7188 ...

Страница 2: ...Wire Stripping and Tinning 11 1 4 9 Wire Color 12 1 4 10 Optional Finishing Touches 12 1 5 Build Process 12 1 5 1 Some Good Rules of Thumb for Building Your Phono Stage 12 1 5 2 Organization of this Manual 13 1 5 3 Electrical Safety Warning 15 Section 2 Mechanical Assembly and Initial Mains Transformer Wiring 16 2 1 Overview 16 2 2 Installing the Feet 17 2 3 Installing the Choke 19 2 4 Installing ...

Страница 3: ...hoke 60 Section 4 M2 Power Supply Testing 66 4 1 Installing the Mains Fuse 66 4 2 Installing the LED Indicator 67 4 3 Installing the Tubes 67 4 4 Tidying Up 67 4 5 Ohm Check 68 4 6 Electrical Testing 68 4 7 Voltage Check Summary 71 4 7 1 DC Voltage Checks 71 4 7 2 AC Voltage Checks 71 4 8 Last Steps 71 Section 5 Phono Stage Board 73 5 1 Overview 73 5 2 Installing the Valve Bases 75 5 3 Installing ...

Страница 4: ...7 Section 8 Finishing Touches 99 8 1 Installing the Front Faceplate 99 8 2 Installing the Chassis Top 99 Section 9 Final Thoughts 100 9 1 Congratulations 100 9 2 Cables 100 9 3 Tube Rolling 101 9 3 1 12AX7 101 9 3 2 6922 101 9 3 3 6X5 101 9 3 4 ECL82 102 9 4 Thanks 102 Appendix 103 A 1 World Mains Voltages Wiring Diagrams 103 A 2 Resistor Color Code Reference 110 ...

Страница 5: ...ave chosen to join us in enjoying and appreciating superb audio and we ve created this manual to help guide you through each step of the assembly process with as much detail and clarity as possible To facilitate the build process the manual has been divided into a number of sections each focusing on a separate aspect of the system follow the sections in order and we guarantee you not only a proble...

Страница 6: ...earnest during the 2000s with development assisted by Audio Note UK engineering Audio Note UK parts were used throughout the kits depending on the various levels and budgets By 2013 ANK Audio Kits as it came to be called had developed a wide product range covering all areas of two channel audio a single ended 300B product line an EL34 classAB and single ended product line digital to analog convert...

Страница 7: ...We believe the M2 Power Supply provides an excellent quality value ratio it has also proved itself in terms of both its reliability and sonic virtues many times over in our other product lines Critically for listening to vinyl it delivers ultra quiet power supply voltages The Phono stage uses the best RIAA components including Takman metal film non magnetic resistors a Mundorf EVO oil film bypass ...

Страница 9: ...ghly it will give you a good idea of what s ahead and help ensure your success 1 4 1 Soldering We highly recommend using lead based solder with some silver content1 on the build You should use lead free ONLY if you are experienced using it and confident Lead free solder requires a higher melting temperature and thus is more difficult to use We don t recommend lead free solder for first time builde...

Страница 10: ...rent at times With regard to voltage ratings normally the voltage rating of the supplied capacitors will be exactly what you see on the parts lists Occasionally a part may be supplied with a higher voltage Think nothing of it 1 4 5 Electrolytic Capacitors For those who have not built a piece of electronics before here is a little lesson on capacitors There are basically two types of capacitors tha...

Страница 11: ... a transformer So if you are asked to use an M3 16mm CSK screw this is an M3 size obviously which is a thinner shaft diameter than an M4 16mm is the length of the shaft and the head type is CSK which is a countersunk or flat head screw Once you have the screws mastered look at the matching nuts such as M4 nut or M3 nut and corresponding washers Standoffs are common in the kits again they are eithe...

Страница 12: ...ders who want to incorporate some of these finishing touches should feel free to do so While we don t officially support or supply parts for these optional enhancements there s no reason why you couldn t or shouldn t do them if you want to and feel that you can handle them Without getting into the details you re on your own here what you ll want to get hold of are heatshrink to bundle wires cable ...

Страница 13: ...of this Manual We have divided the build and the manual into the following sections 1 Introduction 2 Mechanical Assembly and Initial Mains Transformer Wiring 3 M2 Power Supply 4 M2 Power Supply Testing 5 Phono Stage Board 6 Phono Stage IO Connections 7 Testing 8 Finishing Touches 9 Final Thoughts Appendix ...

Страница 14: ...audionotekits rogers com Page 14 Here s another way of looking at how the manual is organized and how the sections fit into the big picture the main sections are mapped so that they mirror how the components will be positioned in the Phono Stage chassis ...

Страница 15: ... safety There are sufficient voltages in this kit to give you a very nasty and harmful shock so be careful when powering on debugging and probing around Please contact ANK Audio Kits via phone or email audionotekits rogers com to discuss any precautions necessary when building the kit if you feel unsure about what you are doing at any stage of the build ...

Страница 16: ...l the feet IEC socket rocker switch and the Choke as well as make the important initial connections to the Mains transformer and install it in the chassis When you receive the kit you will have a series of kit bags In the following sections we ll be using the Hardware bag made up of individual bags for each section of the kit IEC bag containing the Rocker Switch IEC and premade cables fuses etc ...

Страница 17: ...l make it easier to work with as we install the transformers Choke etc Turn the chassis upside down Take a foot and insert an M4 screw with washer into the foot it ll be tight but push it in Install each foot in the hole in the chassis closest to the corner and secure it with an M4 nut on the inside of the chassis Don t overtighten the screw you could damage the foot ...

Страница 19: ...eparation of the Mains Let s begin by installing the Choke This looks simple but given the tight clearance between the Choke and the back of the chassis it can be a bit frustrating Here s a suggested way to go about it Arrange for good lighting from above so that you can see well especially towards the rear of the chassis Neatly lay out the necessary hardware close at hand 4 M4 screws 4 M4 washers...

Страница 20: ... 20 Turn the chassis right side up Take the Choke which is marked CH 180 underneath and hold it in one hand in mid air while you install the four M4 screws and washers from above into the four holes on the base of the Choke so that you can then insert the whole unit into the chassis ...

Страница 21: ...ews at the rear to go through the correct holes If the other 2 screws the ones towards the interior of the chassis fall out just leave them for a moment Do not turn the chassis over With at least the back 2 screws now through the bottom of the chassis successively push down on each screw from above with one hand while simultaneously securing the screw to the chassis from underneath with the lock n...

Страница 23: ...teKits com audionotekits rogers com Page 23 2 4 Installing the Chassis Ground Install an M4 16mm PAN head screw washer and nut into position in the unpainted area on the chassis near the Choke as shown below This will act as the chassis ground ...

Страница 24: ...nd the GND on the bottom Use M3 10mm CSK flat head screws to secure it using M3 nuts Have a look at the picture below Note the orientation of the rocker switch with the smaller pair of tabs towards the side of the chassis and the larger pair towards the middle Install the self locking rocker switch by pressing it in from the back of the chassis it will snap into position The correct orientation of...

Страница 25: ...dded it will be easier to install and secure in the chassis The Mains transformer is a complex device its primary can be configured for many world voltages and its secondary supplies a number of voltages for different needs throughout the Phono Stage It s important to understand what these connections are and where they re located We recommend that you hold the transformer while looking at the thr...

Страница 26: ...its rogers com Page 26 In these diagrams and throughout this manual the Mains transformer will be shown as having three lugs marked 9 0 and 9 While these are used in some products that also use this transformer they are not used in the L3 Phono V2 Just ignore them ...

Страница 27: ...Let s take a moment to talk about how the source AC power enters the L3 Phono V2 and how it is transformed into the various voltages needed throughout the unit The basic theory of what s involved is as follows The AC that comes out of the wall socket will enter the L3 Phono V2 through the IEC switch and the rocker switch into the Mains transformer The Mains will take the input AC voltage 120V AC f...

Страница 28: ... to upgrade performance and reliability This can sometimes lead to some minor differences in the manual between the text current graphics and older pictures particularly If you find a picture that shows any gaps other than the gap between the two sets of three tabs on the secondary just ignore them Gap or no gap the tabs will always be in the same order from top to bottom The graphic below shows t...

Страница 29: ...ier to solder the wire to the lead BUT don t spend too much time soldering the Mains transformer you could melt the bobbin Don t exceed 5 seconds If you don t connect in that time then stop let it cool down and try again later Cut a piece about 2 inches of Black wire as shown that will bend comfortably between the two 0 tabs Strip the ends and lightly tin This can be difficult on a short piece of ...

Страница 30: ...0 and 120 tabs the third and sixth tabs from the top Now we ll add two more prepared wires to the Mains transformer primary Take the Black prepared wire with the crimp on the end tin the unprepared end and solder it to the top 0 tag Similarly take the Red prepared wire with the crimp on the end tin the unprepared end and solder it to the bottom 120 tag To recap the Black wire is connected to the t...

Страница 31: ... Mains Secondary Wiring Have a look at the diagram below Use a short length of Black wire to make a connection between the second and third from the top taps 300 0 at the same time add a 12 piece of Black wire to the second tap 300 as shown Later we ll solder this wire to the M2 Power Supply board ...

Страница 32: ...audionotekits rogers com Page 32 2 9 Installing the Mains Transformer and AC Connections With the wiring above now completed we can now position the Mains transformer into the chassis but do not secure it as we have more work to do around the IEC section ...

Страница 33: ...Copyright 2019 ANK Audio Kits www AudioNoteKits com audionotekits rogers com Page 33 In this section refer to the diagram below for the AC Power On Off and Ground Connections for 120V ...

Страница 34: ...he prepared wire from the IEC bag with the 10R resistor and capacitor in parallel and install it on the chassis Ground screw There should now be 1 Green and 2 Black wires attached and secured to the chassis Ground In some graphics you may see the IEC plug shown upside down While it can go in either way we have chosen to have it installed in the chassis with the GND lug at the bottom this will matc...

Страница 35: ... connection of the other end of the Black and Red prepared cable to the more narrowly spaced tabs of the rocker switch closest to the corner of the chassis as shown in the graphic Now take the Black and Red wires with crimps that are attached to the Mains transformer and connect them to the more widely spaced tabs on the rocker switch towards the Mains as shown in the graphic Here s a picture of t...

Страница 36: ...e 36 Now that you ve checked your work you can secure the Mains transformer into position with M4 screws nuts and serrated washers Position the serrated washers closest to the M4 nut on the underside of the chassis Here s a view underneath the chassis showing the screws in position ...

Страница 38: ...com Page 38 2 10 Shield Positioning We would like to explain where the shield fits at this stage you won t actually be installing it until later by then there will be a number of things inside the chassis so becoming familiar with how it will be positioned should be helpful ...

Страница 39: ...kits rogers com Page 39 Take a look at the shield provided and locate the hole underneath that has no paint on it this will match up with a hole on the chassis that is also unpainted in order to ensure a good grounding of the shield when installed in the chassis ...

Страница 40: ... these will be used to route wires from the Mains transformer and M2 board on the far side of the shield in the picture above to the Phono Stage You will need to remove the shield later on when we wire up to the Mains transformer but for now you can leave it in Congratulations on the Choke and Mains installation Now we ll move onto the M2 Power Supply board But first Time for another break ...

Страница 41: ... board The parts the PCB resistors capacitors etc are in the M2 Power Supply bag Once this section is built we ll run tests for both ohms and voltages to make sure your power supply is working perfectly If there are any problems we ll try and diagnose what s wrong If that doesn t help please contact us by phone or email audionotekits rogers com and we will help you resolve the issue ...

Страница 42: ...leted M2 Power Supply We ll construct the M2 Power Supply board first and then fit it into the chassis The steps we ll follow are Install the Valve Bases Install the Resistors Install the 6V2 Wires Install the Capacitors Install the Bridge Rectifier Install the Zener Diode The Filament Section Additional Wiring ...

Страница 43: ...by installing the valve bases There are two valve bases in the tube rectified and regulated Power Supply Valve Bases QTY Designation Description 1 9 pin Valve Base V1 1 8 pin Valve Base V2 2 Schematics may change from time to time but we ve included this schematic as a guide If you find any differences between this schematic and your board and parts and it concerns you just give us a call ...

Страница 44: ... are opposite to each other to make sure the base stays level then you can add more solder to the pins In the end you can fill up the entire valve base hole Be very careful not to let any solder bridge to the next pin as this will cause a short and your Power Supply will need some serious debugging or resuscitation Insert the 8 pin valve base into the board at position V2 The key in the valve base...

Страница 45: ...ds 100R means that it is 100 ohms the R stands for resistance A resistor that reads 2K7 means it is 2700 ohms the R is assumed and the K which stands for Kilo or 1000 is positioned like the decimal place so it s like reading 2 7K ohms K multiplied by 1000 but it s shortened to 2K7 Another example like this is the 1M resistor which is 1 Mega ohms Use an ohmmeter to measure each resistor to verify i...

Страница 46: ...on each solder joint And when you go to clip a lead be sure to clip above the volcano so that you don t slice off this nice joint Populate the Power Supply board with the resistors first checking the value and then installing them into the correct designation R1 R2 etc as shown on the board Then bend the legs slightly once they are in the board to secure them this way they won t fall out and you c...

Страница 48: ...d Black 6V2 twisted wires on the bottom of the board These wires will be found in Wire Bag 2 These PTFE wires are 22 gauge silver plated copper We ve provided you with a long length of about 80 cm or almost a complete meter Have a good look at the pictures below these show the top and bottom of the board and the wiring that we ll install in this and subsequent steps ...

Страница 49: ...here s a small solder nub at the end of the wire you can just cut off about 1 mm and it should fit nicely through the hole Cut the long twisted Red and Black wires in half strip off the ends twist them tight tin them and then place them from underneath the board into the 6V2 holes found on the board besides C3 and C5 Place the Red wire in the hole and the Black wire in the hole Solder from the top...

Страница 50: ...2 Power Supply The first type are called electrolytic capacitors these are the capacitors like for example the 100uf 450V capacitor which has a stripe down one side You ll remember from the Introduction to the manual that the stripe denotes the NEGATIVE side On the board you ll see a sign which denotes the POSITIVE side Be sure to align the capacitors correctly into position Here s what we want to...

Страница 51: ... Installing the Bridge Rectifier Bridge Rectifier Quantity Value Designation 1 GBU6J6A U1 The Bridge Rectifier accepts AC voltage and generates a DC voltage which will be used to create the DC filament voltages used by the line stage on the Analog board You ll see a notch on the Bridge Rectifier part number GBU6J6A on the right side in the picture below Match the notch with the stencil on the boar...

Страница 52: ...ce the stripe on the Zener Diode and match it with the board stencil Install the Zener Diode in location D7 Also in this picture on the left side in the middle you can see the stencil for D8 which is for one of the 1N4007 regular diodes Let s take this opportunity while we re in the neighbourhood to install one of the 1N4007 regular diodes in D8 again be sure to align the silver stripe on the diod...

Страница 53: ...filament section or the U2 filament section to output either a 6 3V filament or a 12V filament voltage In the L3 Phono Stage V2 the 12AX7 and 6922 tubes on the Phono Stage board need 6 3V for the filament and we ll configure the U2 and U3 sections to meet that need using the 78S05 regulator and 6 1N4007 diodes Diodes Quantity Value Designation 6 IN4007 D1 D2 D3 D4 D5 D6 Install the remaining 6 1N4...

Страница 54: ...allation 3 8 1 Installing the Regulators and Heatsinks Regulators Quantity Value Designation 2 L78S05 U2 U3 Have a look at the picture below Notice that the Black heatsinks have the regulator installed in them The L3 Phono Stage V2 5V regulator is part number L78S05 I know it s really hard to read The picture shows one regulator from the front and back ...

Страница 55: ...in position on the board where it will go Insert the regulator and heatsink into the board as shown in the picture below and solder the 3 pin regulator from underneath the board Let s leave the heatsink itself the 2 pillars unsoldered for the moment Repeat the 2 previous steps with the other regulator and heatsink 3 8 2 Installing the Remaining Capacitors Capacitor Quantity Value Designation 1 22u...

Страница 56: ...tall the 2 film capacitors C1 and C8 It s not a bad idea to secure these large capacitors with cable ties as shown there are holes in the board for that purpose Add the 4 M4 standoffs to the board That completes the build of the M2 Power Supply board Now we ll tackle the additional wiring ...

Страница 57: ...r of 18g to connect to 300V 300V Black Red twisted pair of 18g to 13V6 Black Red twisted pair of 18g to the 8 pin valve base pins 2 and 7 Red HT wire from B Black HT wire from GND LED wires Have a look at the graphic and pictures below to familiarize yourself with these wires and where they re located The marking 13V6 on the board is a legacy of the original design we ll be attaching the 0 8 wires...

Страница 59: ...ire goes to which solder tab Now take the last Green Red twisted pair and similarly connect these wires directly to pins 2 and 7 of the 8 pin valve base Again it doesn t matter which color wire goes to which pin Look closely at the picture above From Wire Bag 3 take a Red wire and connect it to the B and a Black wire to the GND on the far side of C1 the 2 7uf capacitor from the underside of the bo...

Страница 60: ...a fairly tight fit between the Mains and the M2 board in the chassis so go slow and carefully figure out how much wire you re going to trim off Also figure out how you want to route the wire under the board to the Mains transformer always give yourself a little slack but try and do a nice neat job on this section of the build Plan ahead Check out the schematic below to see if what you are doing ma...

Страница 62: ...etween the two standoffs towards the Mains While the board is upside down let s connect the Choke wires from the CH 180 Twist the Red and Black wires from the Choke route them behind the Mains transformer and along the shield towards the M2 Power Supply board you can use some heatshrink here if you like to CH CH on the M2 board there is no orientation either wire can go in either CH Trim the Choke...

Страница 63: ... use 2 screws to lightly secure the M2 board in the chassis it s quite tight to the Mains but the screws will ensure that you ll know what the M2 board s final position will be and that will help you figure out how long the wires need to be and how to route them When you make these connections you ll want to cut the wires to length giving yourself a little slack Then strip and tin the ends You ll ...

Страница 64: ...d in the GND position located near the 13V6 tabs Connect the Red Red twisted pair that comes from the 300V points on the M2 board to the top and bottom pins of the 0 300 0 300 windings of the Mains Here s a picture of that connection Now connect the Green Red twisted pair that comes from the 13V6 on the M2 board to one of the two 8 s and the 0 on the 8 0 8 winding of the Mains as shown Connect the...

Страница 65: ...Supply board are not yet connected B Red GND Black Filaments for the Phono Stage board Prepared wire from the chassis Ground with the 10R resistor and capacitor That completes the M2 Power Supply board Feel free to reinstall the shield back into position or you can wait until nearer the end of the kit build if you prefer Let s test it ...

Страница 66: ...fuse from the IEC bag into position as shown If the fuse holder is already installed in the IEC plug use a screwdriver a flat edge or your fingers to pull it out you ll need to squeeze it to completely remove it Install the fuse in the small plastic fuse holder and insert it into the IEC You can ignore any lettering like 240V only there is only one fuse holder type for all world voltages With the ...

Страница 67: ...the LED is pushed in all the way 4 3 Installing the Tubes Now let s install the tubes into the M2 Power Supply board the 6X5 goes in the 8 pin valve base and the ECL82 or 6BM8 in the 9 pin valve base 4 4 Tidying Up Seeing that we have a number of loose wires coming from the M2 board let s tape the ends of these wires to make sure that they do not short with one another when we test with power This...

Страница 68: ... the location on the board to find these two points You should see a high impedance reading in the 125K ohm range this is a good sign If you have a very low ohmage there could be a problem and you may want to contact us first before going any further 4 6 Electrical Testing THE UNIT IS STILL NOT PLUGGED IN AT THIS POINT Before the first power on we suggest the following steps Make sure that you hav...

Страница 69: ...ow Take a power cord and plug the unit in Press the rocker switch such that the 1 is pushed flat against the chassis this is the ON position Observe the LED turning on and look for a glow from the tubes GET READY TO SWITCH THE UNIT OFF IMMEDIATELY IF ANYTHING GOES WRONG Get your multimeter ready we ll need it for the High Tension HT check Be very careful as you do this not to touch anything in the...

Страница 70: ...3V DC If there is a problem with any of the above voltages switch to AC volts and measure the 300 300 points on the M2 board you should get somewhere over 600V AC If your meter does not go that high try measuring from the GND beside 13V6 to each one of the 300 inputs on the board and you should get approximately 300V AC or slightly higher While in AC mode on your multimeter measure the 13V6 pads o...

Страница 71: ... you have correct voltage readings on the M2 Power Supply board then Congratulations are in order and you have completed the first half of the kit 4 8 Last Steps UNPLUG THE KIT FROM THE WALL One last step you ll remember that we did not solder the heatsinks to the M2 Power Supply board earlier we wanted to complete our testing first Now go back and solder the 2 heatsinks to the board Install 3 gro...

Страница 73: ... Audio Kits www AudioNoteKits com audionotekits rogers com Page 73 Section 5 Phono Stage Board 5 1 Overview In this section we ll be building installing and testing the Phono Stage board the main board of the L3 Phono V2 ...

Страница 75: ...e 6922 Valve Bases QTY Designation Description 2 9 pin Valve Base V1 V2 As you did with the M2 board use some masking tape to secure the valve bases to the board prior to soldering to keep the bases level and use just a little solder to secure each pin to the board before you fill up the entire valve base hole Also be careful not to make any solder bridges Insert the 9 pin valve base at V1 and sol...

Страница 76: ...K R1 R2 2 1K R3 R5 2 1K2 R4 R6 2 100K R8 R9 2 270K R10 R13 2 39K R11 R12 2 470R R14 R15 2 1K2 R16 R17 2 33K R18 R19 2 1M R20 R21 2 2M2 R22 R23 1 2K2 R24 A good way to reduce the possibility of errors is to measure each resistor with an ohmmeter Once this is done you might want to attach the resistors to a sheet of paper and mark the appropriate resistance next to it You can then refer to the parts...

Страница 77: ...on with the picture below 5 4 Installing the Capacitors We are now going to install the capacitors Capacitors Quantity Type Value Designation 4 Elna SILMIC Electrolytic 470uf 35V C1 C2 C10 C12 2 Audio Note Copper Foil 22uf C9 C11 2 Audio Note Copper Foil 1uf C3 C4 2 Rel Cap 2n7 2700pf C7 C8 2 Rel Cap 8n2 8200 pf C5 C6 1 Mundorf MCap EVO Oil 47uf 350VDC large cut out ...

Страница 78: ...ey are in pairs with different values which are identified on the side of each capacitor These four capacitors can be oriented either way Install 2 2n7 capacitors in C7 and C8 Install 2 8n2 capacitors in C5 and C6 Next let s install the 4 Elna electrolytic capacitors As always take great care to orient them correctly with the stripe being the NEGATIVE lead The POSITIVE solder tab is marked Install...

Страница 79: ...e ties as shown to reduce stress on the solder connections There are holes in the board specifically for this purpose Install the large 47uf Mundorf MCap EVO oil capacitor in the large cut out Take care when installing the 4 Audio Note Copper Foil capacitors They all look the same in the picture but they are actually in pairs with different values Install 2 Audio Note Copper Foil 22uf capacitors i...

Страница 80: ...ed from the top of the Phono Stage board and soldered underneath or you can elect to insert the wires under the board recommended it s neater and solder on top Do it the way that is most comfortable for you Let s review the leads that we wired to the M2 Power Supply board that are still unconnected B Red GND Black Filaments for the Phono Stage board Prepared wire from the chassis Ground with the 1...

Страница 81: ...nd capacitor through the left grommet The middle grommet is unused Now let s make the connections4 Here s the big picture 4 Truth to tell you could reverse the Red and Black wire connections it doesn t matter for the filaments but let s do it as shown so that the text and pictures remain aligned This will also make it easier to troubleshoot if need be ...

Страница 83: ...above You can double check this connection it should emerge on the top of the board in L GND as shown below Connect the 2 pairs of twisted Black Red wires coming from the M2 Power Supply board through the right grommet to the solder tabs shown on the underside of the board in the graphic on the previous pages Take great care and double check that you ve made the correct connections These feed the ...

Страница 84: ...ave a look at the following graphic Connect the B Red Wire coming from the M2 Power Supply board to HT1 on the Phono Stage board Connect the GND Black Wire coming from the M2 Power Supply board to GND beside HT1 on the Phono Stage board These wires will bring 260V DC to the Phono Stage board ...

Страница 85: ... exposed It s a good idea to trim the NEGATIVE lead a bit shorter than the POSITIVE lead so that if you need to remove the LED later for any reason you ll know which is the POSITIVE lead the longer lead and will be able to reinsert it correctly Glue or attach Blu Tak works well the LED holder to the front panel so that the LED protrudes through the designated hole as shown below ...

Страница 86: ... Phono Stage board have been made it s time to install the AN A shielded cables that carry the input and output signals In this section we ll install the RCA jacks on the rear of the chassis and connect them to the Phono Stage board one cable will come from the MM input RCA jacks to the inputs on the Phono Stage board and the other from the outputs on the Phono Stage board to the output RCA jacks ...

Страница 87: ... Phono Stage board we will not connect the shield at the RCA jacks end When working with the RCAs jacks we recommend the following procedure Tin the RCA ground lead and put a puddle of solder in the center of the RCA jack Heat the solder puddle and slide the tinned signal lead to be connected into the center of the RCA Similarly hold the tinned Ground lead against the tinned Ground tab of the RCA ...

Страница 88: ... the raised ring facing inwards into the hole The RCA jack Attach from the inside of the chassis onto the protruding jack The other white insulating washer The ground lug The nut don t immediately tighten this more than one or two turns Bend each ground lug up about 30 degrees and position at about 2 o clock Make sure they are away from the chassis Tighten the jacks such that the inner lug is faci...

Страница 89: ... s look at that picture again Install the Ground jack as shown This will be used to ground the turntable to the chassis Install a Ground lug to the chassis as shown below using a 4 mm screw serrated washer and nut and connect it to the Ground jack using some copper braid or other wire It isn t pretty but it does the job ...

Страница 90: ... audionotekits rogers com Page 90 6 4 Wiring the MM Input Connections Now we ll wire the MM input connections These are the two jacks on the RIGHT in the picture below Please refer to the beginning of this section for tips on how to solder to RCA jacks ...

Страница 91: ...s www AudioNoteKits com audionotekits rogers com Page 91 Following the diagram below we ll now make the connections to the MM Input jacks Remove the shield from the end of the AN A wire and prepare the Red and White leads as shown ...

Страница 92: ...2 Connect the Red signal wire to the center of the Right Red input jack on top Connect the White Ground wire to the Ground tab of the Right input jack Here s what it should look like Similarly make the Red signal and White Ground connections to the Left Black input jack on the bottom ...

Страница 93: ...phic above and the picture below Twist the shield and the White wire together refer to the picture above and tin them Connect the Red signal wire coming from the Right input jack to R IN on the Phono Stage board Connect the White Ground wire and the shield coming from the Right input jack to R GND Similarly make the connections from the Left input jack to L IN and L GND ...

Страница 94: ...hono Stage board As we did above with the input jacks we ll connect the shields at the Phono Stage board end but not at the RCA jacks end Connect the Red signal wire to the center of the Right Red output jack on top Connect the White Ground wire to the Ground tab of the Right output jack Similarly make the Red signal and White Ground connections to the Left Black output jack on the bottom ...

Страница 95: ... output jack to R OUT on the Phono Stage board Connect the White Ground wire and the shield coming from the Right output jack to R GND Similarly make the connections to L OUT and L GND Here s another look at these connections This was done by a professional builder Note how he used some black heatshrink over the R GND and L GND twisted White and shield wires connection to improve the look It s rea...

Страница 96: ...it is a good idea to blow some air into the unit and make sure that there are no small pieces of wire or solder floating around You can also hold it upside down and shake it gently in case there s still some debris inside 7 1 Installing the Tubes Install the 12AX7 on the input side on the left in the picture below Install the 6922 on the output side on the right in the picture below ...

Страница 97: ...NG ON If you see or smell nothing alarming coming from the Phono stage cue up some music and turn up the volume a bit If you hear your favorite music with no hum or distortion then Congratulations you have a working L3 Phono Stage V2 Feel free to contact us to share your excitement or if you are having any problems debugging things 7 3 Debugging If you have no sound then the best place to start is...

Страница 98: ...ove the 6922 and 12AX7 tubes 3 Turn the unit on 4 Verify the following voltages measuring in the valve bases on top of the PCB using the following pinouts Test Black Lead Red Lead Approximate Reading B to GND GND HT1 260V DC 6922 6V2 Pin 5 Pin 4 6 3V DC 12AX7 6V2 Pin 4 Pin 9 6 3V DC If all these tests and voltages are correct then contact ANK Audio Kits at audionotekits rogers com We ll help you f...

Страница 99: ...e Front and Back Faceplates Remove the protective films from the front and back of the front and back faceplates Install the front faceplate using four Black M4 CSK flat head screws Install the back faceplate using four Black M3 CSK flat head screws 8 2 Installing the Chassis Top Install the chassis top using the provided hardware ...

Страница 100: ...9 1 Congratulations If you ve made it to this point then CONGRATULATIONS you are ready to insert your L3 Phono V2 into your system and enjoy it 9 2 Cables In our experience high quality cables make a difference A good power cable should make a noticeable improvement to the sound and the interconnects do as well ...

Страница 101: ...audionotekits rogers com to discuss it 9 3 2 6922 The 6922 dual triode tube can be substituted by the readily available 6DJ8 at reasonable prices Before considering any tube substitution other than a 6DJ8 please mail me at audionotekits rogers com to discuss it 9 3 3 6X5 The kit comes with a NOS Russian military equivalent of the 6X5 a 6U5C rectifier made by Reflector Should you wish to substitute...

Страница 102: ... and let us know how everything went were there any errors in the manual or instructions parts lists etc Your ideas regarding greater clarity or tweaks will also be truly appreciated If you have some suggestions that you feel would help other kit builders please let us know We can put them on a support page for other users We d also love to see some great pictures of your build process or your bui...

Страница 110: ... 2019 ANK Audio Kits www AudioNoteKits com audionotekits rogers com Page 110 A 2 Color Code Reference You can also find an Interactive Resistor Color Code Calculator on our website available from the Links page ...

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