Mojotone CANYON Series User manual

1WWW.MOJOTONE.COM
Mojotone’s British Style 18watt TMB Amplifier Kit addresses a
common mod made to a classic circuit, but
with a few new avors of our own. The
18watt TMB is based on the circuit used in
vintage Marshall models 1958, 1973, and
1974 (more affectionately known as the
‘18-watters’.)
These original Marshalls were only produced
between the years 1965 and 1967, but were
highly sought-after for having massive
sounding JTM-45-like tones in a smaller,
more manageable package. Because
they were produced in comparatively low
quantities, these amps still remain a ‘lost ark’
today.
18-watters became popular studio amps
for many players and were used, at
times, by everyone from Gary Moore, to
The Pretenders, to AC/DC. Over the years,
some players have reported having no use
for the amp’s original tremolo channel
and have opted to replace the tremolo
controls with a 3-band EQ, since the
original amps were only equipped with a
single tone control for each channel. In the
Mojotone version, we have done just this.
We have integrated the entire preamp section
and the tone stack from our British 800 kit
(based on the original Marshall JCM 800
circuit) for a lean and mean, hot-rodded gain
sound. We have also integrated a master
volume control so this monstrous sound can
be harnessed and used in any size room.
Two EL84s give the amp’s normal
channel a warm and round character
which, when the volume is pushed higher,
begins to break up into a smooth grind
perfect for blues rock and classic rock
rhythm sounds. On the dirty channel, one
can access screaming lead tones perfect for
everything from dim dirty grunge all the way
to saturated hair metal sustain!
With our TMB mod in place, this take on a
classic beast now has a normal channel with
high sensitivity and low sensitivity inputs
as well as a single volume and single tone
control; the second channel has a single
input with volume, treble, middle, and bass
controls. And don’t forget about the master
volume!
BRITISH STYLE
18 WATT TMB
1 X12 COMBO AMP / AMP HEAD

Copyright © 2019 Mojotone, LLC
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Disclaimer: Mojotone, LLC makes no representations or warranties of any kind as to the information, content, procedures, materials or operation of this book. To the full extent permissible by applicable law, Mojotone, LLC
disclaims all warranties, expressed or implied, including but not limited to, implied warranties of merchantability or tness for any particular purpose. Mojotone, LLC will not be liable for damages of any kind arising from the use
of this book, including but not limited to direct, indirect, incidental punitive and consequential damages.
CONTENTS
INTRODUCTION pg. 3
SECTION 1: SAFETY pg. 3
SECTION 2: INVENTORY pg. 4
SECTION 3: TOOLS pg. 5
SECTION 4: COMPONENT IDENTITY & ORIENTATION pg. 6
SECTION 5: HOW TO READ COMPONENTS pg. 6
SECTION 6: SOLDERING BASICS pg. 7
SECTION 7: CHASSIS ASSEMBLY pg. 8
SECTION 8: CIRCUIT BOARD ASSEMBLY pg. 10
SECTION 9: TRANSFORMER WIRING pg. 12
SECTION 10: CIRCUIT BOARD Installation pg. 14
SECTION 11: WIRING THE SOCKETS, JACKS, POTS & Power Cord pg. 15
SECTION 12: Speaker Wiring & Installation pg. 18
SECTION 13: INITIAL CHASSIS TESTING pg. 19
SECTION 14: Chassis Installation pg. 20
SECTION 15: SOUND TEST pg. 21
SECTION 16: TROUBLESHOOTING pg. 21
MORE FROM MOJOTONE pg. 22

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Introduction
This amplier kit wiring and assembly are based on the same construction methods
that the original designers used 50+ years
ago. This vintage method of assembly is a
“hands-on” experience. You should take your
time when assembling the kit. It’s always
exciting as you get closer to nishing the
build, but this is where errors will normally
occur. It can become overwhelming when
looking at the whole picture of building the
kit, therefore try looking at the amp in small
sections. Ex: The input jacks, preamp section
on the board, power supply section on the
board, wiring the potentiometers, wiring the
preamp tube sockets, wiring the power tube
sockets, transformer wiring and so on.
Remember to take your time and enjoy the
build. If you get stuck on something, step
away from the build for a few hours or a day,
then come back to it.
SECTION 1:
SAFETY
SAFETY FIRST! Electronics can be dangerous
and must be treated with respect. Any
circuit that works with 120VAC power from
an electrical outlet is especially dangerous
and could potentially kill you. Here are some
guidelines to keep you safe as you work.
{Never work on a circuit while power
is applied.
{Do not connect power to a circuit until
the circuit is nished and you have carefully
checked your work (twice).
{If you smell anything burning,
immediately disconnect the power and
examine your circuit to find out what
went wrong.
{Keep your work area dry and organized.
{Be careful around large capacitors.
They can continue to hold voltage long after
they are disconnected from power. Discharge
electrolytic capacitors if power has been
applied to the unit.
{Be especially careful when you solder. A
hot soldering iron can easily burn you.
{Always work in a well-ventilated space.
{Have safety equipment such as a re
extinguisher, a rst-aid kit and a phone nearby.
{Be Patient! Rushing through any type of
technical work just leads to frustration and
compounds issues that can easily be avoided.

BUILD. MODIFY. REPAIR.4
(1) 10” removable power cord
(3) tube spring retainer for EL84
& Ez81
(1) indicator lamp
w/ hardware
input / output jacks w/ hardware
(4) J1 4-lug, (1) J2 2-lug
(2) rubber grommet
(1) Mojotone British Style
18 watt Power Transformer
vacuum tubes*
(1) impedance selector switch
w/ hardware
(8) knobs
(2) toggle switch
w/ hardware
ECC83S
EL 84 EZ 81
SECTION 2:
INVENTORY *optional based on order
(1) void free birch combo / head cabinet*
(1) turret board
(3) tube shield for ECC863
(1)A/C power jack
(1) 1/4” mono plug
w/ hardware
(2) ground tab
(1) Mojotone British Style
18 watt Output transformer
(6) 9 pin tube socket
potentiometers w/ hardware
(1) 1MA , (1) 250kl, (1) 25kb,
(4) 500ka
(1) fuse holder, (1) slow blow 1 amp
fuse w/ hardware
(2) 4 lug terminal
(1) Mojotone British Vintage speaker*
(1) faceplate and backplate*
(1) aluminum chassis
10
9
8
7
6
5
4
3
2
1
12AX7 12AT7
6V6GZ34S
10
9
8
7
6
5
4
3
2
1
12AX7 12AT7
6V6GZ34S
(3)
(2) (1)
ECC83S
EL 84 EZ 81
ECC83S
EL 84 EZ 81
ECC83S
EL 84 EZ 81
ECC83S
EL 84 EZ 81
ECC83S
EL 84 EZ 81
ECC83S
EL 84 EZ 81
ECC83S
EL 84 EZ 81
ECC83S
EL 84 EZ 81

5WWW.MOJOTONE.COM
SECTION 3:
TOOLS
Certain tools are required to successfully build your amp. The following are recommended
to complete your project.
NEED A TOOL? Do you see something on
this list that you need? Turn to page 20
for a full list of tools, parts and kits to
add to your workbench
HARDWARE
(4) turret board standoffs
(2) switch dress nut
(20) 4-40 x
1/4” screw & keps nuts
(2) 8-32 x 1/4’’ screw & keps nuts
(4) 6-32 x 1/2’’ screw & keps nuts
(4) 10-32 x 11/2’’ screw & keps nuts
(2) can capacitor clamps
WIRES
20 gauge pre-tinned PVC coated wire
(4’) Red
(4’) Blue
(6’) YellowYellow
(4’) Green
(4’) Gray
(4’) Black
(2’) copper bus wire
(1’) heat shrink tubing
{1/2'' nut driver
{Set of needle nose pliers (one with teeth
and one without)
{Wire cutters
{Wire strippers
{Soldering iron and solder
{Adjustable wrench
{Phillips head screw driver
{Multimeter
RESISTORS
Carbon Composite
(3) 1/2watt 820Ω
(1) 1/2 watt 2.7KΩ
(2) 1/2 watt 5.1KΩ
(1) 1/2 watt 10KΩ
(1) 1/2 watt 47KΩ
(3) 1/2 watt 68KΩ
(7) 1/2 watt 100KΩ
(7) 1/2 watt 470KΩ
(2) 1/2 watt 1MΩ
(2) 1 watt 100Ω
Metal Oxide
(2) 2 watt 10KΩ
(2) 2 watt 2.7KΩ
Ceramic
(1) 5 watt 270
CAPACITORS
(1) silver mica
47pf @ 500v
(2) silver mica
500pf @ 500v
(2) Sprague Atom
25µf @50v
(1) Mojotone
Electrolytic
KingCap
16µf @475v
(1) Mojo Dijon
4.7nf @ 630v
(4) Mojo Dijon
10 nf @ 630v
(5) Mojo Dijon
22 nf @ 630v
(1) Mojo Dijon
680 nf @ 160v
(2) can capacitor
32µf + 32µf
@500v

BUILD. MODIFY. REPAIR.6
color
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Grey
White
Gold
Silver
TOLERANCE
± 1%
± 2%
± 0.5%
± 0.25%
± 0.10%
± 0.05%
± 5%
± 10%
BAND 1
0
1
2
3
4
5
6
7
8
9
BAND 2
0
1
2
3
4
5
6
7
8
9
MULTIPLIER
1Ω
10Ω
100Ω
1KΩ
10KΩ
100KΩ
1MΩ
10MΩ
100MΩ
1Ω
0.1Ω
0.01Ω
SECTION 4:
COMPONENT
ORIENTATION & IDENTITY
Capacitor orientation
Ensure all polarized caps are in the correct
orientation when installing onto the board.
This is typically denoted by an arrow
pointing towards the negative side, or a
small indention on the positive side.
Safety first! A cap in the wrong orientation
can explode! So follow your wiring diagram
and pay close attention when orienting your
polarized caps.
IDENTIFYING RESISTOR VALUES
The resistors that are included in your
Mojotone kit, all use the 4-band resistor color
code for determining their values. The easiest
way to read the resistors, start by having the
gold strip facing towards the right. The rst two
colors on the left are going to be your values,
for example Yellow & Violet would be 47. The
third strip is going to be your multiplier. So for
this example, the third strip is a yellow stripe
which is 10,000. The value of the resistor is
calculated as such 47 X 10,000 which equals
470,000 ohms or 470K ohms.
NON-POLARIZEDPOLARIZED
4 7 x 10,000 =
470,000 Ω
or
470K Ω

7WWW.MOJOTONE.COM
SECTION 6:
SOLDERING BASICS
Before you start slinging solder in your kit or if you have never soldered before, take
a moment to read over this section about
soldering.
When assembling your amp kit, whether
it’s putting components on the eyelet board,
wiring up the tube sockets or connecting
wires to the potentiometers, the rst thing you
want is a good solid mechanical connection.
So for example if you are connecting a wire
to a pin on a tube socket or on the back of
a potentiometer, you do NOT want to set
the wire on the pin or let it oat loosely and
throw a bunch of solder on there. Solder is
not a great conductor, specially some of the
newer lead-free solder, think of it as more of
a semi-conductive glue. So what you want
is a solid physical connection between the
components that you are connecting together.
For example, when soldering to a tube
socket, you would want to create a hook with
the wire or component lead, hook it through
the pin, then use a pair of needle nose pliers
to pinch the hook together around the pin.
Now the wire has a solid connection to the
pin, so even if solder were to fail, in theory
you have the components connected together.
After you have created the mechanical
“bond”, then you can add a little solder to
help solidify the joint.
Working with eyelet boards
When installing components onto the
eyelet boards, you want the component to
lay or sit down onto the board, feeding the
leads into the eyelets and them bending
them underneath the board. Once all the
components are installed on the board and
the connecting wires are attached as well,
then start soldering the joints. After they have
been soldered, be sure to clip the excess leads
that are underneath the boards so that they do
not short against other components.
PRO TIP: There is an exception to laying a
component down on the eyelet board and
that would be when higher wattage resistors
are in the power supply OR if the amplier
is running the power tubes in a cathode
biased conguration. These components
are dropping voltages across them during
operation, which results in excess heat, and
needs to oat a little above the board to
dissipate the heat.
SOLDERING A CONNECTION
{Connect the components together. Be
sure you have a solid mechanical connection
before you proceed.
{Make sure the tip of the iron is clean.
{Heat the components by touching the tip
of the iron to both components at the same
time. It should take about 2-3 seconds for the
connecting component leads to become hot
enough to ow solder.
{Slowly ow the solder into the connection.
The solder should liquefy and spread over the
connection. If the solder does not melt almost
instantly or if it beads up and falls off, double
check the temperature of your soldering iron
and make sure the tip of the iron is clean.
{Remove the solder from the connection.
{Remove the iron from the connection and
allow the joint to cool. Once it has cooled
you can gently pull the component to test the
connection.

BUILD. MODIFY. REPAIR.8
SECTION 7:
CHASSIS ASSEMBLY
TRANSFORMERS
{Mount the power transformer by rst
removing the black rubber tips on the ends of
the mounting screws. Do NOT remove the nuts
on the transformer. These are used to create an
air gap for dissipating heat. The transformer
will be recessed through the rectangular cutout
in the “belly” of the chassis. Install 8-32 keps
nuts on the left two studs (ones that are closest
to the side of the chassis) and the top right.
Install the 4-lug terminal on the bottom right
stud and fasten with 8-32 keps nuts.
{Install rubber grommets in holes for output
transformer leads.
{Mount the output transformer using the (2)
8-32 x 1⁄4” screws and corresponding keps nuts
onto the outside of the chassis next to the power
transformer (output transformer is not recessed).
Install the transformer so that the Red, Blue and
Brown wires go through the grommet furthest
from the power transformer. The YellowYellow, Black,
Green and Orange go through the grommet
closest to the power transformer. The screws will
go through the outside of the chassis, and the nuts
will be installed in the inside. Use a screwdriver
and adjustable wrench to tighten.
TUBE SOCKETS & CAN CAPACITORS
{Mount can capacitors using (4) 6-32 1/2“
screws and keps nuts and tighten down with
adjustable wrench and screwdriver. Be sure to
mount the ground tab.
power
transformer
power
transformer
cutout
rubber
grommet
holes
output
transformer
mounting
holes
output
transformer
4-lug terminal
8-32
6-32
x 1 /
2
”
6-32
8-32 8-32
8-32
x 1/4”
can capacitor mounted inside chassis can capacitor mounted outside chassis

9WWW.MOJOTONE.COM
MIDDLE TREBLE GAIN TONE VOLUME
MASTER INPUTS
INDICATOR ON
MAINS
ON
STANDBY
BASS
68K
1M
1M
4-40 x 1/4”4-40
500 k 25 k 250 k 500 k 500 k
1 m
500 k
power / standby switch assemblyindicator lamp assembly
potentiometer and knob assembly
“INPUTS” J1 jack assembly
“MASTER” J1 jack assembly
9-pin tube socket assembly
{Mount 9-pin tube sockets using (4) 4-40
x 1⁄4” screws and keps nuts and tighten down
with adjustable wrench and screwdriver. Here
again, make sure to choose an orientation and
keep it uniform throughout all 9-pin sockets.
NOTE: The tube socket closest to the power
transformer and the two closest to the
output transformer will have the spring tube
retainers installed with the sockets.
CONTROL PANEL
{The faceplate will be secured by the
washers and nuts from the components being
mounted through it. Ensure the faceplate
is straight before tightening down the
components and installing the knobs.
{Mount indicator lamp using its pre-
assembled hardware. Unthread the hardware
from the component and insert it through
the chassis and corresponding faceplate
cut out. Reapply hardware and tighten
with adjustable wrench and pliers.
{Mount your Main and Standby switches
using their pre-assembled hardware.
{Mount potentiometers using their pre-
assembled hardware and 1/2” nut driver.
Make sure potentiometers are mounted with
their lugs facing up towards the open end of
the chassis.
PRO Tip: When mounting the pots, make sure
the toothed locking washer goes between
the potentiometer and the chassis. The at
washer will go on the outside of the chassis
and the nut will tighten down.
{Once you have the pots securely installed,
turn the shaft of the pot all the way counter-
clockwise. Install the chicken head knob on
each pot, making sure the pointer of the knob is
pointing to “1” on the chassis. Use a small at
head screwdriver to tighten the set screw in the
back of the knob securely on the pot shaft.
{Mount J2 input jacks using their pre-
assembled hardware and an adjustable
wrench. Pay close attention to the
orientation of the jacks on the wiring
diagram.
faceplate chassis

BUILD. MODIFY. REPAIR.10
SECTION 8:
TRANSFORMER &
COMPONENT WIRING
POWER TRANSFORMER
{Twist all matching pairs of wires
coming out of the power transformer.
{Measure length needed for each wire,
allow yourself extra lead and cut to length.
This will eliminate excess wire and free up
space in your chassis. Apply this principle to
all leads.
{Prepare the two Red wires from the
power transformer (HV secondary). Connect
one wire to pin 1 and the other to pin 7 of the
rectier tube socket.
NOTE: These wires carry AC voltage, so either
wire can go to either pin 1 or 7.
{Prepare the YellowYellow and WhiteWhite wires
from the power transformer (5v rectier
lament). Connect the YellowYellow to pin 5 and
WhiteWhite to pin 4 of the rectier tube socket.
PRO Tip: On stranded wire, twist the stranded
end tight before tinning. This will make it
easier to put through the lug.
{Prepare the two Green wires from the
power transformer (6.3v tube filament)
and connect them to pins 4 and 5 on the
power tube socket closest to the power
transformer.
{Prepare the Black wire and connect to
the mains switch on the lug furthest from the
power transformer.
{Prepare the Green wire with the YellowYellow
stripe and the Red with the YellowYellow stripe and
connect both wires to the grounded lug on the
terminal strip.
{Prepare the Black wire with the Red stripe
and connect it to an empty, non-grounded lug
on the terminal strip.
{Prepare the YellowYellow wire with the WhiteWhite
stripe and connect it to an empty, non-
grounded lug on the terminal strip.
{Run the Black wire with the WhiteWhite stripe
toward the back panel of the chassis where
the power plug will be installed.
68K
1M
500 K 25 K
250 K 500 K 500 K
1 M
500 K
1M

11WWW.MOJOTONE.COM
OUTPUT TRANSFORMER
{Red, Blue and Brown wires are the primary
and the Black, YellowYellow ,Green and Orange are
the secondary.
{Twist the Blue and Brown wires
together and run them between the two
output sockets. Connect the Brown wire to
the 7 pin of the output tube socket closest to the
power transformer. Connect the Blue wire to the
7 pin of the output tube socket furthest from the
power transformer.
{Prepare and connect the Red wire to the
left (+) terminal of the can capacitor that is
installed between the rectier socket (EZ81)
and the power tube socket (EL84).
{Run the secondary wires toward the
rear panel where the impedance selector will
be installed.
COMPONENTS
{Connect The 10k metal oxide resistor
between the positive (+) terminals on the can
capacitor mounted from the inside, and the 2.7k
metal oxide resistor between the positive (+)
terminals on the can capacitor mounted from the
outside.
{Prepare two legnths of YellowYellow wire and twist
together for the standby switch. Connect one wire
from the left terminal of the switch to the 3 pin on
the rectier tube socket. Connect the other from
the right terminal to the left (+) terminal on the can
capacitor mounted from the outside of the chassis.
{Prepare the Black wire for the mains switch.
Connect to the left terminal of the switch and run it
to where the fuse holder will be installed.
{Connect one wire from the indicator lamp
to the right terminal on the mains switch. Run
the other wire to where the power plug will be
installed.
{Prepare the Blue and Green wires for the
can capacitor mounted from the inside of the
chassis. Connect the Blue wire from the right
positive (+) terminal to an open, non-grounded,
lug on the terminal strip. Connect the Green
wire from the Bottom negative (-) terminal to the
grounded lug on the terminal strip.
{Prepare bare wire and connect from
the bottom negative (-) terminal on the can
capacitor mounted from the outside of the chassis
to the closest ground lug. Connect a 10k metal
oxide resistor from the right positive (+) terminal
to the same lug the Blue wire is connected to on
the terminal strip.
{Double check wiring and solder all
connections in this section EXCEPT ones with
the red circle ( ).
68K
1M
500 K 25 K 250 K 500 K 500 K
1 M
500 K
1M
500 K 25 K 250 K 500 K 500 K
1 M
500 K
2.7 K
10 K
68K
10 K
1M

BUILD. MODIFY. REPAIR.12
SECTION 8:
CIRCUIT BOARD ASSEMBLY
& INSTALLATION
{Begin by applying traces (or “jumper
wires”) to the board.
PRO Tip: Utilize the different sections on
the post of the turret when attaching your
wires and components. This makes for easier
soldering and repair.
{Once jumper wires are in place, follow
wiring diagram to create leads where necessary.
These will be the wires that go out from the
component board to other components in the
circuit. Insert these leads down through the front
of the board and bend around back to secure.
PRO Tip: Use the included Wiring Diagram to
approximate lead lengths.
10 nF 10 nF 10 nF
10 nF
4.7 nF
22 nF 22 nF 22 nF
100K
100K
100K
820Ω
47K
47K
470K
470K
470K
470K
5.1K
16uF
680 nF
47 pF
500 pF
25 uF
+
100 Ω
100Ω
25 uF
+
130Ω
2.7 K
5.1K
820Ω
100K
100K
2.7 K
820Ω
470K
500 pF
10K
22 nF
470K
470K
100K
22 nF
10 nF 10 nF 10 nF
10 nF
4.7 nF
22 nF 22 nF 22 nF
100K
100K
100K
820Ω
47K
47K
470K
470K
470K
470K
5.1K
16 uF
680 nF
47 pF
500 pF
25 uF
+
100Ω
100Ω
25 uF
+
130Ω
2.7 K
5.1K
820Ω
100K
100K
2.7 K
820Ω
470K
500 pF
10K
22 nF
470K
470K
100K
22 nF

13WWW.MOJOTONE.COM
{Starting at one end of the front side of
the board, identify the necessary components
for each turret connection and begin placing
the leads into the hole on top of the turret.
PRO Tip: When a capacitor and resistor are
both running between the same turrets,
you can twist their leads, one around the
other, and solder to form a solid mechanical
connection.
{Once all components, jumpers, and
leads are in place, start at one end of the
board and begin soldering every turret.
{Make Sure you don’t have any bad or
“cold” solder joints by lightly pulling each wire
after solder has set.
{Locate the four small pre-drilled holes in
the chassis for mounting the turret board. Install
a turret board standoff on each hole using the
1/4‘‘ 4-40 screws.
{Line the mounting holes on the turret
board with the turret board standoffs and
secure using the 1/4‘‘ 4-40 screws.
10 nF 10 nF 10 nF
10 nF
4.7 nF
22 nF 22 nF 22 nF
100K
100K
100K
820Ω
47K
47K
470K
470K
470K
470K
5.1K
16uF
680 nF
47 pF
500 pF
25uF
+
100Ω
100Ω
25uF
+
130Ω
2.7K
5.1K
820Ω
100K
100K
2.7 K
820Ω
470K
500 pF
10K
22 nF
470K
470K
100K
22 nF
12
3
4
56
7
8
12
3
4
56
7
8
12
3
4
56
7
8
4-40
x 1/4”
standoff
4-40
x 1/4”

BUILD. MODIFY. REPAIR.14
SECTION 10:
WIRING SOCKETS,POTS,
JACKS & CAN CAPACITOR
TUBESOCKETFILAMENTWIRES
ProTip: This is a high gain preamp and is more
sensitive to lament hum from wiring
lead dress. Take care that signal wires
are routed away from the lament
wirings and previous gain stages.
{Twist tightly together a length of about
3’ of Red and Black wire to start wiring the
tube laments. Starting with the power tube
that is closest to the rectier tube, prepare
and connect the twisted wire between the
tube sockets.
PRO Tip: Make sure the power tube laments
are “in phase”. This means that the lament
wires (Red and Black twisted wire running
between the power tubes sockets) must
connect to the corresponding pins between
the sockets. Pin 4 to pin 4, Pin 5 to pin 5.
Preamp tubes do not have to be in phase.
{When wiring the preamp tubes, Be
sure to keep the Red wires close together
and centered when running them across the
tube socket to pin 5. Also note that there is a
jumper between pins 4 & 5.
PROTip: Since there is a wire connected to the
5 pin, you can achieve the jumper wire to
the 4 pin by stripping the wire back further,
running it through the 5 pin and reach to the
4 pin. Solder the wire to both pins. Use this
method on any jumper on the tube sockets.
500 K 25 K 250 K 500 K 500 K
1 M
500 K
10 nF 10 nF 10 nF
10 nF
4.7 nF
22 nF 22 nF 22 nF
100K
100K
100K
100K
820Ω
820Ω
10K
47K
47K
470K
470K
470K
470K
470K
470K
470K
5.1K
16uF
22 nF
22 nF 680 nF
47 pF
500 pF
500 pF
25 uF
+
100 Ω
100 Ω
25 uF
+
130Ω
2.7 K
2.7 K
5.1K
820Ω
100K
100K
2.7 K
68K
100K
1M
68K
68K
10 K
10 K
1M

15WWW.MOJOTONE.COM
TUBESOCKETSIGNALWIRES
{Follow the wiring diagram and begin
wiring the tubes sockets starting from the
power tubes and work your way across the
chassis towards the preamp tubes.
{Prepare two Green wires and connect
one to pin 7 of the far right preamp tube and
run toward the “INPUTS” jacks. Connect
the other from pin 2 and run toward the
“MASTER” jack.
POTENTIOMETERS
{Prepare the bus wire that will mount
across the back of all the pots. Start from the
“BASS” control on the left side and solder
the wire on the back of each pot. This will
provide a place to run to ground since the
pots are all grounded to the chassis.
{Connect a 100k resistor from the right
terminal on the 500k “VOLUME” pot on
the far right to the right terminal on the 500k
“TONE” pot to its left.
{Prepare the two Black wires and connect
from the board to the ground buss wire that is
installed on the back of the pots.
{Follow the wiring diagram and begin
wiring the pots on the front of the chassis
with the Gray wire. Start from the left
“BASS” control and work your way across
the chassis towards the input jacks.
500 K 25 K 250 K 500 K 500 K
1 M
500 K
10 nF 10 nF 10 nF
10 nF
4.7 nF
22 nF 22 nF 22 nF
100K
100K
100K
100K
820Ω
820Ω
10K
47K
47K
470K
470K
470K
470K
470K
470K
470K
5.1K
16uF
22 nF
22 nF 680 nF
47 pF
500 pF
500 pF
25uF
+
100Ω
100Ω
25uF
+
130Ω
2.7K
2.7K
5.1K
820Ω
100K
100K
2.7 K
68K
100K
1M
68K
68K
10 K
10 K
1M
500 K 25 K 250 K 500 K 500 K
1 M
500 K
10 nF 10 nF 10 nF
10 nF
4.7 nF
22 nF 22 nF 22 nF
100K
100K
100K
100K
820Ω
820Ω
10K
47K
47K
470K
470K
470K
470K
470K
470K
470K
5.1K
16 uF
22 nF
22 nF 680 nF
47 pF
500 pF
500 pF
25 uF
+
100 Ω
100 Ω
25 uF
+
130Ω
2.7 K
2.7 K
5.1K
820Ω
100K
100K
2.7 K
68K
100K
10 K
10 K
1M
1M

BUILD. MODIFY. REPAIR.16
INPUTJACKS
{Prepare the Green signal wire from pin
2 of the preamp tube and connect it to the
rear left lug on the “MASTER” input jack.
{Prepare the three jumper wires and
connect to the “INPUTS” input jacks as
shown.
{Prepare the two Black ground wires
and connect to the “INPUTS” input jacks as
shown.
{Prepare the two 68K resistors and
connect to the “INPUTS” input jacks as
shown. Then twist the other ends together.
{Prepare the Green signal wire from
pin 7 of the preamp tube and connect at the
junction of the two 68K resistors. Trim the
excess wire from the 68K resistors.
CAN CAPACITOR
{Prepare the Blue wire and connect from
the can cap mounted between the rectier
tube and power tube, to the turret where the
two 100 Ohm 1 watt resistors meet.
{Prepare the Black wire and connect
from the grounded lug terminal, mounted by
the power transformer, to the turret closest
to the front of the chassis where the 130 Ω
resistor / 25uf capacitor are mounted.
{Prepare the Blue and Red wires and
connect from the can capacitor
mounted on the left side of the
chassis to the two points on the board as
shown.
500 K 25 K 250 K 500 K
500 K
1 M
500 K
10 nF 10 nF 10 nF
10 nF
4.7 nF
22 nF 22 nF 22 nF
100K
100K
100K
100K
820Ω
820Ω
10K
47K
47K
470K
470K
470K
470K
470K
470K
470K
5.1K
16 uF
22 nF
22 nF 680 nF
47 pF
500 pF
500 pF
25 uF
+
100 Ω
100 Ω
25 uF
+
130Ω
2.7K
2.7K
5.1K
820Ω
100K
100K
2.7 K
68K
100K
10 K
10 K
1M
68K
1M
68K
500 K 25 K 250 K 500 K 500 K
1 M
500 K
10 nF 10 nF 10 nF
10 nF
4.7 nF
22 nF 22 nF 22 nF
100K
100K
100K
100K
820Ω
820Ω
10K
47K
47K
470K
470K
470K
470K
470K
470K
470K
5.1K
16uF
22 nF
22 nF 680 nF
47 pF
500 pF
500 pF
25 uF
+
100Ω
100Ω
25 uF
+
130Ω
2.7 K
2.7 K
5.1K
820Ω
100K
100K
2.7 K
68K
100K
1M
68K
68K
10 K
10 K
1M
J1 jack
J1 jack
J1 jack
can capacitor
can capacitor
4 lug
terminal

17WWW.MOJOTONE.COM
SECTION 10:
Rear PANEL ASSEMBLY
& WIRING
{Install rear faceplate, fuse holder,
impedance selector and speaker jacks on the
back of the chassis using included hardware.
Make sure the impedance selector is snug so
that it does not rotate when you are switching
between different output impedances.
{Snap A/C power jack into chassis with
the center pin oriented closest to the inside
of the chassis.
{Follow the wiring diagram and begin
with wiring the fuse holder and working to
the right towards the speaker jacks.
{Install the knob on the impedance selector,
Note which color wire that the selector tab is
pointing to, and align the knob to that number on
the back panel, tighten the set screw. (YellowYellow 4
Ω, Green 8 Ω, Orange 16 Ω).
{Use a small at head screw driver to
remove the fuse holder cap. Install the fuse
into the cap and reinstall into the fuse holder,
push in and twist to the right about a quarter
turn.
from indicator lamp
from mains switch
from power transformer
1 M
BRITISH STYLE 18watt
POWER TRANSFORMER
GAINTREBEL
MASTER
MIDDLE
BASS
10 nF 10 nF 10 nF
22 nF 22 nF 22 nF
100K
100K
100K
820Ω
820Ω
47K
47K
470K
470K
470K
470K
470K
470K
5.1K
47 pF
500 pF
500 pF
100 Ω
100 Ω
5.1K
10 K
10 K
130 Ω
25uF
+
CAN CAPACITOR
32µF + 32µF
@500V
2.7 K
MAINS FUSE MAINS INPUT IMPEDANCE
4 8 16
SPEAKERS
fuse holder assembly
fuse holder A/C power jack
impedance
switch
ground tab
ground tab
J1 jack J2 jack
impedance selector assembly
from output transformer
A/C power jack assembly
input jack assembly

BUILD. MODIFY. REPAIR.18
SECTION 12:
Speaker Wiring &
Installation
SPEAKER WIRING
{Twist the two 15” lengths of Black and
WhiteWhite 18 gauge stranded wire together.
{Push the insulation back about 1⁄2” from
both wires on one end and tin them.
{Unscrew the cover off of the 1⁄4” plug.
Solder the white wire to the tip terminal.
Solder the black wire to the sleeve as shown
in the illustration.
{Bend the two retaining tabs over to hold
the wires to the jack.
{Install the clear plastic shielding over the
wiring, then install the cover on the jack.
{On the other end of the wiring harness,
push back the insulation on the wires by 1⁄2”,
twist and tin them.
{With a pair of needle nose pliers, take the
tinned wire and make a small “hook” on both
the white & black wires.
{Insert the white wire “hook” into the
positive (+) terminal on the back of the
speaker. Use the needle nose pliers to carefully
crimp the “hook” on the terminal, forming a
mechanical connection. Then solder the wire
to the terminal. Repeat the same process with
the black wire on the negative (-) terminal.
SPEAKER installation
{Remove the upper and lower back panel
of the cabinet.
{Mounting holes for the chassis have
already been drilled on the upper back panel.
{Remove the four mounting screws from
the speaker bafe.
{With the cabinet laying face down,
place the speaker on the bafe, line up the
speaker mounting holes with the holes on the
bafe.
{Finger tighten the mounting speaker
screws. Starting with the top left screw,
tighten with a screwdriver, then tighten the
screw diagonally from it. Then tighten the
remaining screws in the same way.
{Reinstall the lower back panel.
ECC83S ECC83SECC83S
ONBASSMIDDLETREBLEGAINTONEVOLUME
MASTERINPUTS
STANDBY
ON
MAINS
INDICATOR
EL 84EL 84
EZ 81
ECC83S ECC83SECC83S
EL 84EL 84
EZ 81
MAINS FUSE MAINS INPUT IMPEDANCE
4 8
16
SPEAKERS
ECC83S ECC83SECC83S
ONBASSMIDDLETREBLEGAINTONEVOLUME
MASTERINPUTS
STANDBY
ON
MAINS
INDICATOR
EL 84EL 84
EZ 81
ECC83S ECC83SECC83S
EL 84EL 84
EZ 81
MAINS FUSE MAINS INPUT IMPEDANCE
4 8 16
SPEAKERS
ECC83S ECC83SECC83S
ONBASSMIDDLETREBLEGAINTONEVOLUME
MASTERINPUTS
STANDBY
ON
MAINS
INDICATOR
EL 84EL 84
EZ 81
ECC83S ECC83SECC83S
EL 84EL 84
EZ 81
MAINS FUSE MAINS INPUT IMPEDANCE
4 8 16
SPEAKERS