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AMP MAKER N5X, Construction Manual

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AMP MAKER N5X Construction Manual Download Page 21

21

www.ampmaker.com

Ground the power supply board

There's just one more wire to add,
to ground the relevant
components on the power supply
board. Take a piece of black wire
and connect it from the turret at
the negative lug of C16 and connect it to the centre lug of the tag-strip.

Now that the power supply is completed, it should look like this (below). Double-check your layout
against this diagram and make sure that each connection is correct and each solder joint good before
moving on to test the power supply.

Summary of Contents for N5X

Page 1: ...s build guide assumes you have an N5X kit from Amp Maker above but you can also follow the instructions if you want to build the amp with parts that you have sourced yourself If so you ll have to adju...

Page 2: ...log Master knob VR6 1M lin Power knob D1 UF4007 D2 12 1V 1 3W zener D3 UF4007 D4 UF4007 Q1 MOSFET insulator S1 DPDT centre off Boost S2 SPST Bypass S3 DPST On Off V1 9 pin socket shield V2 9 pin socke...

Page 3: ...he resistance There s a tolerance in all components and in the resistors values will be within 5 of the specified value such as 98 2 for the 100 Ohm resistor It s also very apparent that a few resisto...

Page 4: ...ell over the maximum voltage present inside any part of this amplifier it s a different story for the capacitors They are all specified and rated according to their place in the circuit and the voltag...

Page 5: ...he pot and for others it s printed on the front of the pot On the second type you can only see the value when you view the pot from the shaft of the pot you can just make out B1M in the picture below...

Page 6: ...the correct way around as shown in the build guide diagrams that follow WARNING The MOSFET needs special handling so do not take it out of its anti static bag silver or pink plastic instead of clear...

Page 7: ...d shielded Don t worry there s more than enough cable to build the amplifier In addition a bag of hardware includes all of the fasteners you need to mount the parts to the chassis Chassis and control...

Page 8: ...nnected But it is a good idea to become familiar with schematics They are the definitive guide to how any circuit works From a schematic you can follow the signal path check the connections of compone...

Page 9: ...9 www ampmaker com...

Page 10: ...e second part of the amp shaded in light yellow in the block diagram This uses the other half of the ECC83 preamp valve V1b Many of the components are similar to the first stage and there s the other...

Page 11: ...inputs to suit your local mains voltage 100V 120V 220V 230V and 240V Valve heater supply The mains transformer has two outputs known as secondary windings One of these supplies the valves with a low...

Page 12: ...e I will try to describe the most methodical way to build the amplifier So hopefully you can avoid any such problem The image opposite shows a fully annotated chassis with all hardware installed in po...

Page 13: ...13 www ampmaker com...

Page 14: ...sary you can loosen one of the M F spacers and adjust it slightly in its hole At this point do not fix the turret boards in the chassis We ll get to that later Other lightweight hardware In general it...

Page 15: ...he chassis when viewed from the inside and M4 hardware without a ground lug at the far left Then add the three speaker output sockets orientating them so that the solder lugs are all facing out of the...

Page 16: ...the wires are in roughly the correct positions For the N5X amplifier layout the thicker green wires of the heater supply go through the rubber grommet that s closest to the centre of the chassis with...

Page 17: ...ound the turrets as shown above and at each end wrap the wire around the last turret Add power supply components Now trim and solder the components to the board as shown in the diagram below A few not...

Page 18: ...ires it s best to tin the end with solder and then bend it to create a hook that you can place around each turret shaft shown above in step by step form Use needle nose pliers to crimp the hook around...

Page 19: ...them to the top pair of lugs on the On Off switch Then connect the six remaining wires from the power transformer First choose the correct two wires for your mains supply 100V white and blue 120V gre...

Page 20: ...I know is grounded a radiator another amplifier chassis that s plugged into the mains etc to discharge any static 2 The 1 tip here is keep handling to a minimum Pick it up only when you need it and do...

Page 21: ...e of black wire and connect it from the turret at the negative lug of C16 and connect it to the centre lug of the tag strip Now that the power supply is completed it should look like this below Double...

Page 22: ...compontent lead offcuts loose wires wire whiskers etc Double check even the smallest could create a short circuit Then tuck the output transformer s loose wires well out of the way so they cannot flop...

Page 23: ...voltages switch to one of the lower voltage ranges For example if you measure the heater supply using a 500V range you will most likely see a figure of 7 but if you switch to the 20V range you would s...

Page 24: ...m to show how the valve pins are numbered Finally make a similar loop to the V1 valve socket and this time connect one green wire to pin 9 and the other green wire to pins pin 4 and 5 When completed t...

Page 25: ...a bare bus wire that runs from the ground lug at the bottom left edge of the board a bare bus wire that runs from the ground lug at the bottom right edge of the board an insulated red wire as shown h...

Page 26: ...n the mists of time it s conventional to indicate positive terminals on schematics but negative terminals on the capacitors themselves So I ve shown both on this diagram to make things clear TIP If yo...

Page 27: ...the V1 wiring and it should look like this Then make the two yellow wire connections for V2 and V3 This connects their cathodes to the turret board Pay special attention to V3 you must strip a little...

Page 28: ...The other end is connected only to lug 1 Don t solder any of the lugs yet Now take about 12cm of the shielded wire and strip one end of it so that you have a short length of shield twisted together to...

Page 29: ...uch easier to get into the solder lugs see the tip below 3 When soldering to the long row of solder lugs and turrets with many wires that cross each other be VERY careful not to accidentally burn thro...

Page 30: ...for the Boost switch S1 because it has six lugs instead of two But take the same approach and it will work out just fine Once again for clarity I have hidden all other wires so that you can concentrat...

Page 31: ...orange wire from the output transformer Trim this wire to length and solder it in place making sure to also solder the ground bus wire you ve added too Now trim and connect the grey green and yellow...

Page 32: ...lly there s the preamp s power supply wire to add also between the two turret boards Take some red wire from the as yet unconnected turret at the end of R19 on the main turret board and run it over to...

Page 33: ...33 www ampmaker com...

Page 34: ...accurately display resistance under 1 Ohm so you will never get a perfect continuity reading of 0 Ohm Touch one of the DMM s probes to the chassis grounding lug close to the Input socket J1 and then...

Page 35: ...d of the plug at the end of the guitar cable 2 Between the Earth or ground pin of your mains plug and the shield of the plug at the end of the speaker cable 3 Between the Earth or ground pin of your m...

Page 36: ...the IEC mains cable into wall socket and switch the amplifier on keeping your fingers multimeter probes etc outside the chassis The neon light should start to glow and you may hear a low level acousti...

Page 37: ...the centre and the Bypass switch up Make sure there s no guitar plugged into the Input but do plug a suitable speaker into into one of the outputs Plug the IEC cable into the mains socket and switch o...

Page 38: ...Amp Maker if it s more than 50mA _________mA 2 EL84 screen current Divide the K L figure by the value of R18 2 2k Ohms A typical result is 4mA Get in touch if it s more than 6mA _________mA 3 EL84 pl...

Page 39: ...e value of R18 2 2k Ohms A typical result is 2 4mA Get in touch if it s more than 6mA _________mA 3 Octal plate current Subtract the screen current 2 above from the cathode current 1 above to get the...

Page 40: ...the other controls in turn Each should operate smoothly Check the extra gain provided by the Boost and Bypass switches Remember that the Treble Middle and Bass controls won t work when the bypass swi...

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