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www.ampmaker.com

This build guide describes how to build the

N5X guitar amplifier kit from Amp Maker.

The N5X is the successor to the very

popular SE-5a 'British Overdrive' amplifier

kit. The

circuit is almost identical, but

with some of the most popular
modifications added as standard:

1. VCB for getting power valve

distortion at lower room volumes

2. Switchable boost: None/Bright/Fat
3. Bypassable tone stack for more gain
4. More power valve options:

EL84/6V6/6L6/EL34/etc

5. All popular speaker impedances

covered: 4/8/16 ohms

This 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
adjust the build to cater for differences in
the parts you have (transformer taps,
etc). If you're building with your own
chassis, or a donor chassis, I strongly
suggest you follow the general parts
layout shown in the guide to help avoid
noise/hum/etc issues from a sub-
optimal layout.

I've tried to make this build guide as

easy as possible to follow and that means
that it contains a lot of detail, tips and
practical advice to help things go
smoothly. If you have any feedback -
please let me know.

A M P

M A K E R

N5X

Construction guide

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Содержание N5X

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 9: ...9 www ampmaker com...

Страница 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...

Страница 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...

Страница 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...

Страница 13: ...13 www ampmaker com...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 33: ...33 www ampmaker com...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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