BYOC Classic Brit 50 Instructions Manual Download Page 1 | Manualshive

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BYOC Classic Brit 50 Instructions Manual Download Page 1

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Build Your Own Clone

Classic Brit 50

Kit Instructions

(Revision 1.0)

WARNING!!! HIGH VOLTAGE!!!!

Tube amplifiers contain high voltage that can cause injury and even death. Please use extreme caution and common sense when
building this kit. Do not attempt to do anything to your amp while it is plugged in other than take voltage readings as necessary or
actually playing an instrument through it as it was intended.

Don't just turn the power off!!! Always unplug the power cord from the socket before working on your amp!!! The mains supply can
still electrocute you AND the power filter capacitors can still retain a charge powerful enough to kill you. Always unplug the power
cord from the socket before working on your amp.

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Summary of Contents for Classic Brit 50

Page 1: ...ything to your amp while it is plugged in other than take voltage readings as necessary or actually playing an instrument through it as it was intended Don t just turn the power off Always unplug the...

Page 2: ...free of any majors errors that would cause you to permanently damage any components in your kit but does not guarantee that the instructions will be free of typos or minor errors BYOC Inc does not wa...

Page 3: ...ck of your progress A very brief description of your specific problem will do It will also make it easier to see if someone else is having or has had the same problem as you The question you are about...

Page 4: ...n page 21 50 Populating the Circuit Board page 51 66 Wiring page 67 75 Wiring Tube Side page 76 93 Wiring Potentiometer Side page 94 111 Wiring Layouts Diagrams page 112 113 Turning Your Amp on for th...

Page 5: ...Orange 1 33K Orange Orange Orange 2 47K Yellow Purple Orange 4 68K Blue Gray Orange 1 82K Gray Red Orange 5 100K Brown Black Yellow 3 220K Red Red Yellow 2 470K Yellow Purple Yellow 4 1M Brown Black...

Page 6: ...F 150V Electrolytic 1 220uF 25V Electrolytic 2 32 32 Electrolytic Really big with three terminals 1 33 33 Electrolytic Somewhat big with three terminals Potentiometers 3 A1M Bass Loudness 1 and Loudne...

Page 7: ...or 220V or 240V 1 HT Fuse 500mA 3 Rubber Grommets 25 M3 screws 12 M3 nuts 6 4 lock washer 6 Wire nuts 6 M4 screws 6 M4 nuts 6 M4 flat washers 6 8 internal lock washers for the M4 screws nuts 4 10 nut...

Page 8: ...nsformers as well This will provide you with more than enough wire to complete your kit Tubes 3 ECC83 2 EL34 Transformers 1 Power Transformer Classic Tone 40 18033 1 Output Transformer Classic Tone 40...

Page 9: ...9 Chassis Assembly Step 1 Add grommets...

Page 10: ...ient the choke so that the side with the wires is over the grommet hole The power transformer will already have mounting screws attached Use 10 nuts and flat washers for the power transformer Use the...

Page 11: ...11 Step 3 Add the tube sockets red arrows...

Page 12: ...do this you can just use wire to jump the two pins together Orient the 9 pin sockets so that pins 4 5 are closer to the back side of the chassis Use M3 screws to mount the 9 pin sockets The chassis wi...

Page 13: ...13 Only add the ring terminal to the power tube sockets Do not add a ring terminal to any other tube socket Use M3 screws and M3 nuts See next page for exploded diagram...

Page 14: ...14...

Page 15: ...to mount to chassis Use M3 screws to mount to chassis of the left capacitor Green arrow Use M3 screw and nut to tighten clamps Use M3 screw M4 flat washer and M3 nut to attach mounting ring of the rig...

Page 16: ...16 Step 5 Add flat mount fuse holder Use 1 x M3 screw and 1 x M3 nut...

Page 17: ...17 Step 6 Add the rear plexi panel and rear panel mounted parts The plexi panels are EXTREMELY DELICATE 6a Mount the AC Power Cord Receptacle Use black flat head screws for power cord receptacle...

Page 18: ...y switch Bend the rotary switch tab flat before mounting to the panel 6c Mount the two speaker jacks and the panel mounted fuse holder After these are in place use an M3 screw to secure the far end of...

Page 19: ...row is pointing in the same direction as the ON label on the plexi panel The lamp is not mounted with any nuts or bolts You simply push it through its hole and it will lock in place The lamp may be lo...

Page 20: ...20 7b Mount all the potentiometers and the four remaining jacks...

Page 21: ...21 Wiring power section...

Page 22: ...22 Step 1 Solder the High Voltage Center Tap red yellow and Heater Center Tap green yellow wire to ground via the lower lock washer w solder tab...

Page 23: ...re if you are using 120V Cut the black wire if you are using 240V These are you mains wires for the power transformer Leave them long enough so that you can switch them if you need to at a later date...

Page 24: ...24 Step 3 Connect the OFF side of the MAINS switch to the center lug of the panel mounted fuse holder...

Page 25: ...25 Step 4 Attach the remaining terminal on the panel mount fuse holder to the L terminal of the AC receptacle...

Page 26: ...26 Step 5 Attach the Black wire from the transformer Or brown if using 240V and one lamp wire to the ON side of the MAINS switch...

Page 27: ...27 Step 6 Connect the remaining lamp wire and the blue wire from the transformer to the N terminal of the AC receptacle...

Page 28: ...7 connect the OFF side of the STANDBY switch to the red lug of the first 32 32 capacitor At the same time make a jump connection between the positive lugs Only solder at the green arrows not the red a...

Page 29: ...ect the silver lug of the first 32 32 capacitor to the silver lug of the second 32 32 capacitor Connect the E terminal of the AC receptacle to the silver lug of the second 32 32 capacitor and then con...

Page 30: ...30 Step 9 Connect ON side of the STANDBY switch to one end of the flat fuse holder...

Page 31: ...31 Power Wiring Drawing...

Page 32: ...32 Step 10 Add bus wire to the speaker jacks Solder on the green arrows not on the red arrows yet...

Page 33: ...33 Step 11 Connect the black wire from the OT secondary Common to the Sleeve bus and solder...

Page 34: ...34 Step 12 Connect the yellow orange and purple wires to the rotary switch as shown...

Page 35: ...35 Step 13 Using a piece of white wire connect the tip bus to the pole terminal of the rotary switch as shown Solder the tip bus...

Page 36: ...36 Step 14 Connect the Output Transformer primaries to their respective sockets Blue to pin 3 of the V5 power tube which is closest to the power transformer Red to pin 3 of the V4 output tube as shown...

Page 37: ...Watt resistor from pins 1 8 of the V5 power tube tube closest to the power transformer to the terminal ring page 13 and solder It is difficult to see in the picture but one end of the resistor is thr...

Page 38: ...or the V4 power tubes but this time also add a black wire to the terminal ring Connect the other end of the black wire to the remaining unsoldered lug on the speaker jacks You should now have all of t...

Page 39: ...ubes One green wire goes to pin 2 the other to pin 7 of each power tube It does not matter which green wire goes to which pin Insert the wires into the their solder terminals Before you solder insert...

Page 40: ...40 Step 18 Continue daisy chaining the heater wire to the pre amp tubes Pre amp tube filament pins are 9 and 4 5 You will need to jumper pins 4 and 5 if you elected not to crimp them together earlier...

Page 41: ...41 Step 19 Connect 1k 5W resistors between pins 4 and 6 of V4 and V5 as shown Only solder on pin 4 of both sockets for now...

Page 42: ...42 Step 20 Using a length of brown wire make a jump between pins 6 of each power tube Only solder pin 6 of V5 closest to the transformer...

Page 43: ...43 Tube Side Wiring...

Page 44: ...the potentiometers as shown We will refer to this as the ground bus If you are having trouble connecting the bus wire to the back of the potentiometers you can rough up the backs with some emery clot...

Page 45: ...45 Step 22 Connect a 1uF capacitor between lugs 1 and 2 of the B25K Presence potentiometer Thread the extra lead through lug 1 and solder it to the back of the potentiometer as shown...

Page 46: ...tor between the tip and sleeve terminals of each jack threading the extra lead through the sleeve terminal to the tip disconnect terminal as shown Connect a 4 piece of black wire to each sleeve termin...

Page 47: ...47 Step 24 Use of bus wire to connect the sleeve terminal of the other input jacks to the tip disconnect terminal as shown Only solder the terminals with green arrows...

Page 48: ...48 Step 25 Mount the input jacks and connect the black wires to the ground bus at the green arrow...

Page 49: ...49 Step 26 Connect the ground bus to the last terminal washer mounted to the power transformer and solder at the green arrows...

Page 50: ...50 Chassis Wiring Layout...

Page 51: ...51 Populating the Circuit Board Step 1 Run bus wire along turret lugs as shown Solder the bus wire jumps...

Page 52: ...52...

Page 53: ...53 Step 2 Insert trimpot so that one wiper is not inserted into a turret lug as shown...

Page 54: ...It is easier to solder the bus wire connections first Do not use too much solder It will fill up the turret lugs and run out through the other side If you are having problems with this tilt the circui...

Page 55: ...55 Drawing of component placement so far DO NOT solder the red arrows yet...

Page 56: ...56 Step 3a Add the large capacitors that were left out of the previous step and solder all connections...

Page 57: ...57 Completed Board Component Placement Picture...

Page 58: ...board between the potentiometer side of the 8 2k 2W and 100K 82K junction Make a 2nd connection between 82K 100K and potentiometer side of the 10K 1W Make a 3rd connection between 820Ohm 220uF 2 7k 68...

Page 59: ...rd between the 15K 10uF junction and the 200k 200k junction Add a 2nd jumper connection between the potentiometer side of the 47K and the 10K 1uF junction Add a 3rd jumper connection between the left...

Page 60: ...60 Top side picture with component values and the underside wires Top of pic is the potentiometer side Bottom of pic is the tube side...

Page 61: ...61 Example of wire connections to top tier of turrets...

Page 62: ...K 2W resistor Use 8 of brown and yellow wires off each 200K 022uF junctions Use 8 of white wire off the 10K 1uF junction Use 4 for all other wires Here we are using black wires for all ground connecti...

Page 63: ...63 Step 7 Connect off board wires to the two 68K 68K junctions and 500pF 470K 470K junction Thread the wires through the board as shown at the red arrows use 6 of wire for these connections...

Page 64: ...es to the tube side of the circuit board Use 7 of red wire from the currently unused turret lug Use 7 of green wire off the tube side of the 8 2K 2W resistor Use 6 of orange wire from the tube side of...

Page 65: ...65 Step 9 add the 3 hex standoffs at the red arrows Use M3 screws...

Page 66: ...66 Top side component picture showing the location of the standoffs in green...

Page 67: ...the board so they stick out on the tube side red arrows Also run the red wire coming from the potentiometer side of the 8 2K 2W resistor under the board green arrows 11 b Make sure you can get to the...

Page 68: ...68 Wiring Step 1 Connect the red wire from the empty turret lug to the previously unsoldered lug of the first 32uF 32uF capacitor Solder the capacitor lug shown at green arrows...

Page 69: ...he rectifier diodes as shown Solder both connections WARNING A DO NOT make wires leads so long that they go through the turret lug and out of the other side They may touch the chassis and cause a shor...

Page 70: ...70 Step 3 Attach the green wire from the tube side of the rectifier diode junction to the remaining lug of the flat fuse holder green arrows...

Page 71: ...side of 8 2K 2W resistor to the YELLOW terminal of the 32uF 32uF electrolytic capacitor red arrows Also connect the green wire from the tube side of the 8 2K 2W resistor to the RED terminal of the 32u...

Page 72: ...72 Step 5 Connect the remaining white OT wire and one of the choke wires it doesn t matter which choke wire to the previously empty turret lug green arrow solder...

Page 73: ...a short piece of brown wire connect the unsoldered pin 6 of V4 to the tube side of the 8 2K 2W resistor At the same time connect the remaining choke wire to the same turret lug green arrows Solder all...

Page 74: ...74 Step 7 Prepare the 5 6K 1W resistors as shown The straight piece will go into pin 5 of V4 and V5 in the next step...

Page 75: ...ires from the potentiometer side of the 220k 022uF junctions to pin 5 of V4 and V5 using the 5 6K 1W resistors prepared in the previous steps Attach the brown wire to V5 and the yellow wire to V4 show...

Page 76: ...76 Step 8 Attach the orange wire from the tube side of the 47K resistor to the orange OT wire that is already attached to the rotary switch green arrows...

Page 77: ...77 Tube Socket Wiring...

Page 78: ...78 Step 1 Attach the first white wire from the 47pF 100K 022uF junction to pin 6 of V3...

Page 79: ...79 Step 2 Attach yellow wire from 47pF 82K 022uF junction to pin 1 of V3...

Page 80: ...80 Step 3 Attach brown wire from 1uF 1M junction to pin 7 of V3...

Page 81: ...p 4 Attach the white wire from the 470Ohm to pin 8 of V3 Make sure you either strip enough to make a jump to pin 3 or use a piece of bus wire to make the jump Shown with green arrows solder both pins...

Page 82: ...82 Step 5 Connect the 2nd yellow wire from the 1M 022uF junction to pin 2 of V3...

Page 83: ...resistor and jumper to V2 Thread one end of a 100K 1 2W resistor through pin 1 of V2 Bend the lead around and thread through pin 7 Insert the other end into pin 6 Solder pins 1 7 Green arrows DO NOT...

Page 84: ...84 Step 7 Connect brown wire from 10K 2W 32uF 32uF capacitor to pin 6 of V2 green arrow solder pin 6 of V2 now...

Page 85: ...85 Step 8 Attach white wire from the 100K 33K 500pF junction to pin 8 of V2...

Page 86: ...86 Step 9 Connect yellow wire from 68uF 820Ohm junction to pin 3 of V2...

Page 87: ...87 Step 10 Connect brown wire from 470K 470K junction to pin 2 of V2...

Page 88: ...88 Step 11 Connect white wire from 022uF 100K junction to pin 6 of V1...

Page 89: ...89 Step 12 connect yellow wire from 68K 68K junction to pin 7 of V1...

Page 90: ...90 Step 13 Connect brown wire from 022uF 100K junction to pin 1 of V1...

Page 91: ...91 Step 14 Connect white wire from 68K 68K junction to pin 2 of V1...

Page 92: ...92 Step 15 Connect the yellow wire from 68uF 2 7K junction to pin 8 of V1...

Page 93: ...93 Step 16 Connect remaining brown wire to pin 3 of V1...

Page 94: ...94 Wiring diagram for Tube Side For high Res image click here http byocelectronics com brit50tubesidewiring pdf...

Page 95: ...95 Wiring Potentiometer Side Step 1 Attach the first black wire to the ground bus green arrows...

Page 96: ...96 Step 2 Connect the white wire from the 1uF 10K junction to lug 3 of the PRESENCE potentiometer green arrows...

Page 97: ...lug 1 of the BASS pot and lug 3 of the MIDDLE pot green arrows Solder both lugs Step 3b Make a second jump between lug 2 of the BASS pot and lug 1 of the Treble pot Only solder on the green arrow DO N...

Page 98: ...98 Step 3c Connect a piece of black wire from lug 1 of the MIDDLE pot to the ground bus...

Page 99: ...99 Step 4 Connect the brown wire from 022uF to lug 2 of the TREBLE pot...

Page 100: ...100 Step 5 Connect next black wire to ground bus as shown...

Page 101: ...101 Step 6 Connect yellow wire from 022uF to lug 2 of the MIDDLE pot...

Page 102: ...102 Step 7 Connect white wire from 022uF to lug 1 of the TREBLE pot Solder the connection now...

Page 103: ...103 Step 8 Connect brown wire from 500p to lug 3 of the TREBLE pot...

Page 104: ...104 Step 9 Attach next black wire to the ground bus...

Page 105: ...105 Step 10 Connect lug 1 of both LOUDNESS pots to the ground bus...

Page 106: ...106 Step 11 Connect yellow wire from 470K 500p junction to lug 2 of the LOUDNESS 1 BRIGHT TREBLE pot...

Page 107: ...107 Step 12 Connect the white wire from 470k to lug 2 of the LOUDNESS 2 NORMAL pot...

Page 108: ...108 Step 13 Connect the brown wire from 022uF to lug 3 of the LOUDNESS 1 BRIGHT TREBLE pot...

Page 109: ...109 Step 14 Connect the final brown wire from 022uF to lug 3 of the LOUDNESS 2 NORMAL pot...

Page 110: ...two 2 pieces of wire make a jumper between the tip connection of the LOWER input jacks and the disconnect connection of the UPPER jacks Solder the LOWER jacks at the green arrows DO NOT solder the re...

Page 111: ...111 Step 16 Connect the yellow wires to the tip terminals of the upper jacks and the white wires to the disconnect terminal of the upper jacks Solder all connections now...

Page 112: ...112 Diagram for Potentiometer Side Wiring For High Res image click here http byocelectronics com brit50potsidewiring pdf...

Page 113: ...113 120V Layout Go to http www byocelectronics com brit50 120layout pdf for high res PDF...

Page 114: ...Go to http byocelectronics com brit50 240layout pdf for high res PDF Note The difference between 120V and 240V wiring is using the brown wire on the transformer instead of the black and a 2Amp fuse fo...

Page 115: ...o do so is with the chassis laying on a non conductive flame retardant surface with the transformer side facing down and the open side of the chassis facing up making sure that no foreign objects espe...

Page 116: ...but it will reduce the amount of damage that will be done if you get do electrocuted It won t make you impervious to electrocution but the less grounded you are the less the amount of current that wi...

Page 117: ...trolytic capacitor 305VDC at position D the right positive lead of the 32uFx32uF electrolytic capacitor on the circuit board and 280VDC at position E the left positive lead of the 32uFx32uF electrolyt...

Page 118: ...83 tubes Plug the AC power cord into the wall Turn the mains toggle switch on Keep the standby switch off You should see all the tubes start to heat up and glow Step 16 Turn all the knobs down and tak...

Page 119: ...L34s On one of the EL34 tubes measure the voltage on pin 3 To do this Place your multimeter on the maximum VDC setting place the black lead into a screw hole or any other ground connection Then touch...

Page 120: ...taste Loudness 1 only works if you have an input in either of the two 1 inputs Loudness 2 only works if you have an input in either of the two 2 inputs Jumpering You can use a patch cable to connect o...

Page 121: ...This is where the fuse goes It says 2AMP but be sure to use a 3A if you are in a 120VAC country Impedance Selector Set this 3 position switch to match the impedance of the speaker s you are using Spea...

Page 122: ...122 Diagrams and Schematic...

Page 123: ...123 Circuit board top side...

Page 124: ...124 Circuit Board Wiring showing from top side...

Page 125: ...125 Power Section and Heater Wiring for hi res pdf go to http www byocelectronics com brit50powerwiring pdf...

Page 126: ...126 Schematic For hi res pdf go to http www byocelectronics com brit50schematic pdf...

Page 127: ...127 For technical support visit www byocelectronics com board Written by N W Kenning K Vonderhulls Artwork Photography by N W Kenning Copyright BYOC Inc 2016...

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