Mojotone Tweed Champ User manual
THE MOJOTONE
TWEED CHAMP
5F1 STYLE COMBO AMP
Mojotone’s Tweed Champ Style Amp Kit is based on the
beloved 5 watt amp from the 1950s. These amps were
perfect for recording and were featured on a wide array
of recordings from Joe Walsh’s “Rocky Mountain Way” all
the way to Derek & the Dominos’ “Layla.” Modeled after
the historic Class-A 6V6 platform, this amp delivers warm
tones that are harmonically rich and have a beautiful low
volume crunch.
The amp utilizes one 6V6 power tube and one 12AX7
preamp tube, giving the amp its famed lush harmonic
composition. We chose our Mojotone American Vintage
AV8C 15 Watt speaker to complement the 5F1 style circuit
since it has a nice clean sound at its lowest volumes but
introduces an articulate and unique grit as you increase the
amp’s volume.
Don’t be fooled by the fact that this circuit features only a
single volume control; 5F1s have been used by some of the
greatest guitarists and on some of the greatest recordings
of all time. Our Tweed Champ style amplier is extremely
tactile and responds well to dynamic playing; so no matter
if you play jazz, classic rock, blues or anything in between,
you will not be disappointed.
CONTENTS
SECTION 1: SAFETY PG.3
SECTION 2: TOOLS PG.3
SECTION 3: PARTS INVENTORY PG.4
SECTION 4: COMPONENT IDENTITY & ORIENTATION PG.4
SECTION 5: CHASSIS PREPARATION PG.6
SECTION 6: TRANSFORMER WIRING PG.8
SECTION 7: BOARD ASSEMBLY PG.10
SECTION 8: BOARD INSTALLATION INTO CHASSIS PG.12
SECTION 9: WIRING THE SOCKETS, JACKS & POTS PG.13
SECTION 10: INITIAL CHASSIS TESTING PG.14
SECTION 11: CAB PREP & SPEAKER INSTALLATION PG.15
SECTION 12: CHASSIS INSTALLATION PG.16
SECTION 13: SOUND TEST PG.17
SECTION 14: TROUBLESHOOTING PG.17
MORE FROM MOJOTONE PG.18
Copyright © 2018 MojoTone, LLC
All content included in this book including text, graphics and images is the property of MojoTone, LLC and protected by U.S. and international copyright laws. The collection, arrangement and assembly of all
content in this book is the exclusive property of MojoTone, LLC and protected by U.S. and international copyright laws. You may not copy, reproduce, distribute, publish, display, perform, modify, create derivative
works, transmit, or in any other way exploit any part of copyrighted material without permission from MojoTone, LLC .
www.mojotone.com 3
SECTION 1:
SAFETY
SECTION 2:
Tools
SAFETY FIRST! ELECTRONICS CAN BE DANGEROUS AND MUST BE TREATED WITH RESPECT.
ANY CIRCUIT THAT WORKS WITH 120 VAC POWER FROM AN ELECTRICAL OUTLET
IS ESPECIALLY DANGEROUS AND COULD POTENTIALLY KILL YOU. HERE ARE SOME
SAFETY GUIDELINES TO KEEP YOU SAFE AS YOU WORK:
CERTAIN TOOLS ARE REQUIRED TO SUCCESSFULLY BUILD YOUR AMP. THE FOLLOWING
TOOLS ARE RECOMMENDED TO COMPLETE YOUR PROJECT:
• ½”NutDriver
• Setofneedlenosepliers (one with no grip and one with serrated edge)
• WireCutters
• WireStrippers
• SolderingIron&Solder
• AdjustableWrench
• PhillipsHeadScrewdriver
• Drillwith3/16”drillbitand5/32”drillbit
• SharpieMarker
• Ruler
• Multimeter
• Lotsofpatience
• Never work on a circuit while power is applied.
• Donot connect power to a circuit until the circuit is nished and you have carefully checked your work (twice).
• Ifyousmellanythingburning, immediately disconnect the power and examine your circuit to nd out what
went wrong.
• Keepyourworkareadryandorganized.
• Becarefularoundlargecapacitors; they can continue to hold voltage long after they are disconnected from
power. Discharge electrolytic capacitors if power has been applied to the unit.
• Beespeciallycarefulwhenyousolder. A hot soldering iron can easily burn you.
• Alwaysworkinawell-ventilatedspace.
• Havesafetyequipment such as a re extinguisher, a rst-aid kit and a phone nearby.
• BePatient! Rushing through any type of technical work just leads to frustration and compounds issues that can
easily be avoided.
NEED A TOOL? DO YOU SEE SOMETHING ON THIS LIST THAT YOU DON’T HAVE? TURN TO
PAGE 18 FOR A FULL LIST OF TOOLS, PARTS AND KITS TO ADD TO YOUR WORK BENCH.
BUILD. MODIFY. REPAIR.
4
SECTION 3:
PARTS INVENTORY *optional based on order
(1) Solid Pine Cabinet*
(1) Eyelet Board & Backer Board
Vacuum Tubes*
(1) 1MA Potentiometer
w/ hardware
(1) Chicken Head Knob (1) Fuse Holder & 2amp Fuse
w/ hardware
(1) J12A 1/4'' Shorting Jack
w/ hardware
(2) Octal Tube Socket & Tension Clamp (1) 9-Pin Tube Socket & Tube Shield
(1) MOJO 760 Power Transformer
w/ hardware
(1) NOS 771 Output Transformer
(1) Chrome Chassis
(1) 10'' Install Power Cord (1) 8'' Jensen C8R 25w 4Ω Speaker*
(1)
(1)
(1)
5Y3 6V6
12AX7
100Ω
1M
220K
68K
100K
22K
4.7K
1.5 K
470Ω
5Y3 6V6
12AX7
100Ω
1M
220K
68K
100K
22K
4.7K
1.5 K
470Ω
5Y3 6V6
12AX7
100 Ω
1M
220K
68K
100K
22K
4.7K
1.5 K
470Ω
5Y3 6V6
12AX7
100Ω
1M
220K
68K
100K
22K
4.7K
1.5 K
470Ω
5Y3 6V6
12AX7
100 Ω
1M
220K
68K
100K
22K
4.7K
1.5 K
470Ω
5Y3 6V6
12AX7
100 Ω
1M
220K
68K
100K
22K
4.7K
1.5 K
470Ω
www.mojotone.com 5
SECTION 4:
COMPONENT IDENTITY & 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 NEG-
ATIVE SIDE, OR A SMALL INDENTION ON THE POSITIVE SIDE.
SAFETY FIRST! A CAP IN THE WRONG ORIENTATION CAN EXPLODE! SO FOLLOW YOUR SCHEMATIC
AND WIRING DIAGRAM AND PAY CLOSE ATTENTION WHEN ORIENTING YOUR POLARIZED CAPS.
POLARIZED NON-POLARIZED
++
--
--
(1) Indicator Lamp Assembly
w/ hardware
(1) Jewel Lens (2) Rubber Grommets(1) Speaker Jack
w/ hardware
(1) Pilot Light (1) Three-Lug Ground
RESISTORS CAPACITORS HARDWARE
WIRES
22 gauge Yellow Pre-Tinned
(4) 4-40 1/4'' Screw & Kep Nuts
(2) 8-32 1/4’’ Screw & Kep Nuts
(6) 4-40 3/8’’ Screw & Kep Nuts
(2) 6-32 1/2’’ Screw & Kep Nuts
(2) 10-32 11/2’’ Screw & Kep Nuts
18 gauge Green Pre-Tinned
22 gauge Black Stranded
22 gauge White Stranded
(2) .022µf @ 600v Orange Drop
(1) 2w 4.7k Metal Oxide
(1) .5w 220k Carbon Comp.
(2) .5w 22k Carbon Comp.
(1) .5w 1m Carbon Comp.
(2) .5w 1.5k Carbon Comp.
(2) .5w 100Ω Carbon Comp.
(2) .5w 68k Carbon Comp.
(1) 16µf @ 475v Electrolytic
(2) 8µf @ 475v Electrolytic
(2) .5w 100k Carbon Comp.
(1) 25µf @ 50v Sprague Atom
16uF
8uF
25uF
+
0.022uF
BUILD. MODIFY. REPAIR.
6
Mount the fuse holder using its pre-
assembled hardware and adjustable wrench.
Install fuse.
Solder the two 100Ω resistors on the
indicatorlampthen mount it using its pre-
assembled hardware and adjustable wrench.
1 2
1 AMP
FUSE
12AX76V65Y3
12
3
4
56
7
8
12
3
4
56
7
8
TWEED CHAMP Layout Model 5E3
Revision 2.1 12/03/2018
1
2
3
4
5
6
7
89
SECTION 5:
Chassis preparation
PLEASE NOTE: ALL PARTS LISTED IN THE CHASSIS PREP SECTION STARTS AT ONE END OF
THE CHASSIS AND COMPLETES ON THE OPPOSITE END, BOTH TOP AND BOTTOM.
Mount the power transformer
using its pre-assembled hardware and
your 1/2“ nut driver. The transformer
will be recessed through the
rectangular cutout in the “belly” of the
chassis.
Installrubbergrommets 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 and Blue wires go through
the grommet closest to the power
transformer. The wire goes through
the grommet furthest from 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.
POTENTIOMETER
OCTAL TUBE SOCKETS
RUBBER GROMMETS
9-PIN TUBE SOCKET
SIDE
VIEW
BOTTOM
VIEW
POWER TRANSFORMER
INPUT JACKS
SPEAKER
JACK
FLATTENED VIEW OF INSIDE OF CHASSIS
FUSE
HOLDER
INDICATOR
LAMP
GROUND
LUG
www.mojotone.com 7
Mount the potentiometer using its 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.
Quick Tip: When mounting the pots, make
sure the toothed locking washer goes between
the potentiometer and the chassis. The flat
washer will go on the outside of the chassis
and the nut will tighten down
Onceyouhavethepotssecurelyinstalled, 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.
Solder the 1M resistor on the speaker
jack closeset to the potentiometer. using their
pre-assembled hardware and 1/2” nut driver and
adjustable wrench, mount the two input jacks. Be
sure to note their orientation on the wiring diagram.
Mount octal tube sockets and tension clamp
using the (4) 3⁄8” 4-40 screws and keps nuts. When
mounting, be sure to choose an orientation and
keep this orientation uniform throughout all octal
sockets. Install octal sockets with solder lugs facing
inside the chassis. While mounting octal sockets, it
is best to simultaneously mount tube clips. To do so,
use your hand to hold tube clip over mounting holes
on the outside of the chassis, while still holding tube
socket in place. Insert screw from the outside towards
the inside, fasten nut from the inside. Repeat with
second mounting hole, then tighten both nuts using
a screwdriver.
PRO Tip: Mount the ground lug on the 5Y3 tube
socket screw closest to the edge of chassis.
Mount9-pintubesockets using (2) 1⁄4” 4-40 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.
CHASSIS CROSS-SECTION FOR COMPONENT ASSEMBLY - INDICATES CHASSIS EDGE
OCTAL
SOCKET
9-PIN
SOCKET
POT. &
KNOB
INDICATOR
LAMP
FUSE
HOLDER
INPUT JACKS SPEAKER JACK
1M
BUILD. MODIFY. REPAIR.
8
POWER TRANSFORMER SCHEMATIC
INDICATOR
LAMP
VOLUME 1M
MOJO 760ex
FUSE
HOLDER J12A J12A
12AX7
SPEAKER
JACK
6V65Y3
100Ω
100Ω
12
3
4
56
7
8
12
3
4
56
7
8
TWEED CHAMP Layout Model 5E3
Revision 2.2 12/04/2018
1
2
3
4
5
6
7
89
SECTION 6:
TRANSFORMER WIRING
PLEASE NOTE: ONLY MAKE FINAL SOLDER CONNECTIONS IF ALL LEADS ARE CONNECTED
TO COMPONENT. IT IS BEST TO ONLY SOLDER EACH JOINT ONE TIME, SO UNLESS ALL
COMPONENTS ARE IN PLACE, WAIT TO SOLDER.
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.
Strip (1/2”) and tin the two Red
wires from the power transformer
(HV secondary). Solder one wire to
pin 4 and the other to pin 6 of the 5Y3
rectier tube socket, the octal socket
that is closest to the power transformer.
These wires carry AC voltage, so either
wire can go to either pin 4 or 6.
Measure,strip, and tin thetwo
Yellow wires from the power
transformer (5v rectifier filament).
Connect these two wires to the top
opening of pins 8 and 2 of the 5Y3
rectifier tube socket. Solder pin 2 but don’t
solder pin 8 yet.
Measure,stripandtinthe2Greenwires from
the power transformer (6.3v tube lament). These
will go to your indicator light with the (2) 100Ω
resistors to ground.
Measure and strip the Black and White
wires coming from the power transformer. One of
these will go to your fuse and one will go to the
potentiometer on the bottom lug. (It doesn’t matter
which wire goes to either component)
Doublecheckyourwiring.
POWER TRANSFORMER
FROM OUTPUT TRANS.
0V
BLACK (10”)
120V
BLACK (10”) GREEN (10”)
GREEN (10”)
RED (10”)
RED (10”)
RED/YELLOW (10”)
YELLOW (10”)
YELLOW (10”)
5V AC @ 4A
6.3V @ 4A
330V @ 75MA
330V @ 75MA
FLATTENED VIEW OF INSIDE OF CHASSIS
www.mojotone.com 9
pro tip:
SOLDERING BASICS
Primary is Blue and Red. Secondary is Yellow.
SoldertheBluewire from the output transformer
to pin 3 of the 5Y3 octal socket closest to the rectier.
SoldertheRedwire from the output transformer
to pin 3 of the octal socket closest to the
speaker jacks.
Connect the Yellow wire from the output
transformer to the tip lug of the speaker jack.
Doublecheckyourwiring.
OUTPUT TRANSFORMER
OUTPUT TRANSFORMER SCHEMATIC
Prepare the joint to be soldered, i.e. twist leads
together, hook leads into eyelets, etc.
Tin(apply solder to)thetipofthesolderingiron.
This will keep it from oxidizing and prolong the life
of your soldering tip. Wipe excess on sponge.
Cleanthetipoftenwhilesoldering.This will help
the iron heat more consistently and evenly.
Be sure to use clamps or tweezers if needed to
hold the components to be soldered in place.
Touchtheirondirectlyonthejointto be soldered
for about two seconds to get it hot enough to melt
the solder.
Touchthesoldertothejoint. As it melts let it ow
onto the joint to create a solid bond.
Liftthe solder offrst and then remove the iron
from the component.
Anothermethod is to tin the stripped wire and then
touch it directly to the heated component.
Placesolderingironbackintotheholder.
5000 Ω 4 Ω
YELLOW (3.5”)
LEAD GROUNDED TO CASE
RED (5.5”)
BLUE (5.5”)
SOLDERING IS AN ESSENTIAL SKILL FOR EVERY LEVEL OF AMP BUILDER. HERE ARE A FEW
TIPS FROM THE AMP PROS AT MOJOTONE.
SAFETY FIRST! THE SOLDERING IRON TIP REACHES A TEMPERATURE OF 400˚C
SO NEVER DIRECTLY
TOUCH IT OR ANY COMPONENT THAT YOU ARE SOLDERING WHEN IT IS HEATED. ALWAYS WORK IN A
WELL VENTILATED AREA OR USE A SMOKE ABSORBER.
SOLDER EXAMPLES
PROPER
SOLDER
PROPER
SOLDER
COLD
SOLDER
COLD
SOLDER
BUILD. MODIFY. REPAIR.
10
SECTION 7:
BOARD ASSEMBLY
FOLLOW THE WIRING DIAGRAM TO POPULATE BOARD. BE SURE TO TAKE NOTE OF POLARIZED
CAPACITOR ORIENTATION FOR THE (1) 16UF CAPS, (2) 8UF CAPS AND (1) 25UF CAPS.
CROSS-SECTION OF EYELET BOARD
COMPLETED WITH COMPONENTS
TWEED CHAMP Layout Model 5E3
Revision 2.2 12/04/2018
370V 325V 165V275V 19V
1.65V
1.65V165V
220K
68K
68K
100K
100K
22K
22K
1.5 K
1.5 K
0.022 uF
0.022 uF
8uF
16 uF
8uF
25uF
+
4.7K
470Ω
370V325V165V 275V19V
1.65V
1.65V 165V
Starting at one end of the front side of the
board, identify the necessary components
for each eyelet connection and place leads
through the eyelet holes. Once inserted, bend
the leads under the bottom of the board to hold
them in place.
PRO Tip: When a capacitor and resistor are both
running between the same eyelet holes, you
can twist their leads around one another and
solder to form a solid mechanical connection.
Once all components are in place on the
front side of the board, ip the board over and
start applying traces or jumper wires to the
backside of the board. These are illustrated on
your wiring diagram as striped lines connecting
different eyelet holes. Use your yellow cloth-
covered wire and cut each piece to size. Insert
leads and bend around front of eyelet board to
secure them.
PRO Tip: Make a small hook with the wire so
that the wire “hooks” into the eyelet.
www.mojotone.com 11
Oncejumperwiresareinplace, 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.
Quick Tip: Use the included Wiring Diagram to
approximate lead lengths
Once all components, jumpers, and leads
areinplace, start at one end of the board and
begin soldering every eyelet hole.
MakeSure you don’t have any bad or “cold”
solder joints by lightly pulling each wire after
solder has set.
BACK SIDE OF EYELET BOARD
TWEED CHAMP Layout Model 5E3
Revision 2.2 12/04/2018
370V 325V 165V275V 19V
1.65V
1.65V165V
220K
68K
68K
100K
100K
22K
22K
1.5 K
1.5 K
0.022 uF
0.022 uF
8uF
16 uF
8uF
25uF
+
4.7K
470Ω
370V325V165V 275V19V
1.65V
1.65V 165V
BUILD. MODIFY. REPAIR.
12
SECTION 8:
BOARD INSTALLATION INTO CHASSIS
Holdyourboard up tothechassis roughly in
the area it will need to be installed.
Locate the two small ber board mounting
holesdrilled into the chassis. With these in mind,
try to eyeball a good place to drill these holes into
your berboard. This should be between large
components so you don’t risk puncturing anything
vital.
Onceyouhaveidentied a good orientation for
the holes, hold the berboard in place and using
the left edge as a guide, make a small mark with a
pencil or sharpie on the edge of your chassis as a
guideline.
Inserttheblankbackboardintothechassisand
align its left edge with the sharpie / pencil guideline
you just made.
Oncealigned, hold the backboard rmly in place,
tilt the chassis onto it’s side and use your sharpie
/ pencil guideline to mark the backboard through
the mounting holes.
Usingan1⁄8”drillbit, create the mounting holes
in your backboard.
Linebackboardup with main component board
and mark the component board through the holes
in the backboard.
Using the same drill bit, make the mounting
holes in your main component board. Be careful
when drilling that you do not drill through any
components or clip them.
Tilt the chassison it’s side and insert the 6-32
screws from the top of the chassis through to the
outside.
Holdingthescrewsinplace, insert the backboard
into the chassis, and push the mounting holes down
over the screws.
Repeatwithmaincomponentboard.
Usethe6-32kepsnuts and hand tighten screws.
Once in place, fasten down the screws and nuts
using a screwdriver and adjustable wrench.
INDICATOR
LAMP
VOLUME 1M
MOJO 760
FUSE
HOLDER J12A J12A
12AX7
SPEAKER
JACK
6V65Y3
100 Ω
100 Ω
12
3
4
56
7
8
12
3
4
56
7
8
TWEED CHAMP Layout Model 5E3
Revision 2.2 12/04/2018
1
2
3
4
5
6
7
89
HOLES FOR BOARD MOUNTING
COMPLETED
COMPONENT
BOARD
BACKER BOARD
www.mojotone.com 13
SECTION 9:
WIRING THE SOCKETS, JACKS & POTS
PLEASE NOTE: SPACE IS VERY LIMITED IN A TWEED CHASSIS. THINK AHEAD WHEN SOLDERING
THE LEADS INTO PLACE AND STAY ORGANIZED. FOLLOW THE WIRING DIAGRAM AND WORK FROM
THE FRONT OF THE CHASSIS TO THE BACK AND FROM THE POWER TRANSFORMER END OVER.
SoldertheB+wire from the lower left eyelet of
the board to pin 8 of the rectier. Verify that you
have 2 wires on pin 8 of the rectier socket
Using the Wiring Diagram, begin wiring the
tube sockets starting from the power tubes and
work your way across the chassis towards the pre-
amp tubes.
ReferringtotheWiringDiagram, install and wire
the input jacks. This is one of the most problematic
areas for wiring. Be sure to note orientation of
solder lugs.
Pro Tip: Remove Input Jacks to install the resistors
before you begin wiring
Referring to the Wiring Diagram, wire the
potentiometer.
Referring to the Wiring Diagram, Install the
three-line power cord and strain relief.
INDICATOR
LAMP
VOLUME 1M
MOJO 760
FUSE
HOLDER J12A J12A
12AX7
SPEAKER
JACK
6V65Y3
100 Ω
100 Ω
12
3
4
56
7
8
12
3
4
56
7
8
TWEED CHAMP Layout Model 5E3
Revision 2.2 12/04/2018
1
2
3
4
5
6
7
89
1M
220K
68K
68K
100K
100K
22K
22K
1.5 K
1.5 K
0.022 uF
0.022 uF
8uF
16 uF
8uF
25 uF
+
470Ω
BUILD. MODIFY. REPAIR.
14
SECTION 10:
INITIAL CHASSIS TESTING
Ensure all solder joints and connections are good.
Physicallyinspect every tube socket closely.
Look and listen for loose hardware by shaking
chassis.
Ensure chassis is free from debris before plugging in.
Check for pinched or burnt wire insulation.
Adjust lead dress so it is easy to see components.
Poweronamp without the tubes installed.
Usingamultimetercheck the power transformer
secondary AC voltages for 6.3v (at tube socket for
laments). This will be pins 4,5 and 9 on pre-amps
and pins 2 and 7 on the 6V6’s.
Usingamultimetercheck for 5v on pins 2 and 8
of the rectier socket.
Turnofftheamp and install the rectier tube (5Y3).
Turnonamp and allow it to warm up (approximately
one minute). Watch for any kind of arcing or
smoke from any component or transformer. If you
see anything, shut down the amp immediately.
Disconnect the amplier from wall socket, check
voltages on the lter capacitors (DC voltage), make
sure they are drained, and then recheck your wiring.
Check the B+ voltages with on pin 8 on the
rectier and pin 3 on the output tube socket. Turn
off the amplier.
Install the preamp tube, then power up the
amplier and ensure the laments are working.
Check the B+ voltages on pin 1 and pin 6 of the
preamp tube.
Turntheampoff and install the output tube (6V6).
Pluginthespeaker.
Powerontheamp and check for proper lament
operation.
Checkthevoltagesat the test points on the wiring
diagram. Check the voltage on pin 5 of the 6V6
tube. Ensure the voltage reading is near 0V +/-
50mV to avoid “red-plating” of the tubes.
Quick Tip: Red plating occurs when too much
current is applied to the plate (anode) of a vacuum
tube. It will overheat and glow cherry red. Turn the
power off immediately if this happens.
Lettheampidle on for half an hour or so for the
chassis to be warm and do the bump test.
Quick Tip: A bump test is exactly what it means.
Use a non conductive tool, such as a wooden
handle of hammer or plastic handle of a screw
driver, to hit the edge of the chassis or pick your
amp up about an inch and drop it.- Don’t worry it
won’t harm your amp. This helps you test for bad
solder joints and any loose hardware as well as lets
you know if there is a physical problem with one
of your tubes.
www.mojotone.com 15
CABINET PREPARATION
Remove the upper and lower back panel of the
cabinet.
Mounting holes for the chassis have already
beendrilledand are located on either side of the
chassis cutout.
Testtyourchassis into the cabinet.
SAFETY FIRST! THE TUBES WILL BE HOT IF
THE AMP WAS RECENTLY ON.
Ensure that the (4) copperhead bafe mount screws
are tight. This is called a “oating” bafe design
and is prone to rattle if the hardware is not tight.
SPEAKER INSTALLATION
Unscrew the four nuts from the speaker mounting
bolts inside the cabinet. Align the speaker mounting
holes to the bafe bolts then place the speaker into
the cabinet with the terminals on top and facing
the chassis.
Note the orientation of the speaker terminals and
gently press the speaker onto these bolts ensuring
that the bolts are emerging through the mounting
holes of the speaker at the same time.
QUICK TIP: Be careful! It’s easy to stick a speaker
stud through the speaker cone.
Install and tighten the KEPS nuts.
SPEAKER WIRE HARNESS ASSEMBLY
Twistthe two 15” lengths of black and white 18ga.
stranded wire together.
Pushtheinsulationback 1⁄2” from both wires on
one end and tin them.
Solder the tinned wires to the plug; White through
the center and soldered on the tip (trim excess),
and Black to outer bottom lip.
SECTION 11:
CAB PREP AND SPEAKER INSTALLATION
220K
68K
68K
100K
100K
22K
22K
1.5K
1.5K
0.022uF
0.022uF
8uF
16uF
8uF
25uF
+
4.7K
470Ω
220K
68K
68K
100K
100K
22K
22K
1.5 K
1.5 K
0.022uF
0.022uF
8uF
16 uF
8uF
25uF
+
4.7K
470Ω
220K
68K
68K
100K
100K
22K
22K
1.5 K
1.5 K
0.022uF
0.022uF
8uF
16uF
8uF
25uF
+
4.7K
470Ω
BUILD. MODIFY. REPAIR.
16
SECTION 12:
CHASSIS INSTALLATION
Installthe2chassismountscrews into mount
holes on top of cab. Turn the cabinet upside down
may make it easier for chassis installation.
PRO TIP: Be mindful of tweed and tolex when
installing. Use painter’s tape if you need to at pinch
points for the cab, as it can protect from tearing or
lifting up the tweed covering.
Makesureyoudonotpinchanywires between
the chassis screws/nuts, chassis and cabinet. Do
not over-tighten the chassis screws as it may deform
and weaken the cabinet.
Place the chassis into the cabinet, lining up
holes with mount screws.
Install and hand tighten the keps nuts for the
chassis screws. Do not tighten these two screws
yet. Leave them somewhat loose for chassis
alignment.
Holdtheupperbackpanelinplace and slide
the chassis back so it is ush against the back panel.
Remove the back panel and tighten down the
two chassis mount screws.
Checkchassisalignment with the back panel in
place, adjust as necessary.
Plugspeakerintospeakerjack..
Install the cord strain relief to the side of the
cabinet using #6 screw.
Installthetubes.
Install the upper and lower back panels. Do
not over-tighten the screws.
12AX7
12AX7 J11 5Y36V6
5Y3
6V6
CHASSIS REAR PANEL
PLUG SPEAKER
CABLE HERE
www.mojotone.com 17
SECTION 13:
SOUND TEST
SECTION 14:
TROUBLESHOOTING
CONGRATULATIONS!! YOU HAVE JUST BUILT YOUR VERY OWN TWEED DELUXE. THERE IS
ONLY ONE ON THE PLANET THAT IS LIKE YOURS. WE HOPE YOU HAVE ENJOYED THIS
EXPERIENCE AND GAINED KNOWLEDGE TO HELP YOU BECOME MORE CONFIDENT TO BUILD
MANY MORE AMPS AND SPREAD YOUR KNOWLEDGE.
DEPENDING ON THE ISSUE YOU HAVE, YOU WILL NEED TO DIAGNOSE WHICH PART OF
THE CIRCUIT IS FAULTY. TRY TO WORK THE PROBLEM ANALYTICALLY, YOU CAN MAKE
PROBLEMS WORSE OR CREATE NEW ONES BY DOING UNNECESSARY REPAIRS. 99% OF THE
TIME IT IS SIMPLE, A BAD SOLDER JOINT, NO SOLDER ON JOINT, CAPACITOR IN BACK-
WARDS, ETC.. HERE ARE A FEW RESOURCES WE SUGGEST.
RESOURCE WEBSITES
• www.ampwares.com
The best resource with the most extensive info on most vintage amps.
• https://robrobinette.com/How_Amps_Work.htm
The non-electronic tech’s guide to understanding basic tube ampliers and how they work . By Rob Robinette
• TDPRI.com
Telecaster discussion page reissue -various builders are on this forum and a wealth of info for history and help.
RESOURCE LITERATURE
• TubeGuitarAmplierEssentialsandAllAboutVacuumTubeGuitarAmpliersby Gerald Weber
Truly must read books by Gerald Weber for any amp tech. You can purchase these at Mojotone.
• TheTubeAmpBook By Aspen Pitman.
A great resource for schematics and basic tube info. Comes with DVD that has over 800 schematics of vintage tube
amp technology.
• RCATubeReceivingManual
This is one of the books that really started the guitar amp craze. In the back of the book, there are many drawings
that will look familiar to you. Leo Fender used this very book to develop his rst amps. These are out of print, but
you can nd them on Ebay and Amazon.
Turnontheamp and let it warm up.
Afterwarm-up, ensure the tubes are not “red plating.”
Rotateallcontrolsfullyandlistenfornoise. It is normal to have some noise at high volume levels.
Pluginaninstrumentcable and listen for any crackle, pops, strange oscillations or feedback.
Leaveonforawhile so the tubes and components can “burn in” - (not literally)
ROCKOUT!!
BUILD. MODIFY. REPAIR.
18
TWEED CHAMP 5F1 STYLE COMBO
TWEED DELUXE 5E3 STYLE COMBO
MOJOTONE TWEED BASSMAN 5F6-A STYLE COMBO
BLACKFACE PRINceTON REVERB® STYLE COMBO
BLACKFACE DELUXE REVERB® STYLE COMBO
Mojotone’s Tweed Champ Style Amp Kit is based on the beloved 5 watt amp from the
1950s. These amps were perfect for recording and were featured on a wide array of
recordings from Joe Walsh’s “Rocky Mountain Way” all the way to Derek & the Dominos’
“Layla.” Modeled after the historic Class-A 6V6 platform, this amp delivers warm tones
that are harmonically rich and have a beautiful low volume crunch. SKU # G1TCK910
Mojotone’s Tweed Deluxe Style Amp is based on the popular 5E3 circuit from the 1950s
and is by far our most popular amplier. These amps were originally designed as medium
power amps that would allow a musician to plug in more than one amplied instrument at
a time. At higher volumes, this amp produces saturated tones that were adopted as signature
tones for the likes of Billy Gibbons, Neil Young, Don Felder, and Larry Carlton. SKU # G1FTD819
Mojotone’s Tweed Bassman Style Amp is based on the late 50s 5F6-A circuit which seems
to be the most commonly used of the Bassman circuits. These 40 Watt amps are known
for their bold and pristine clean sounds as well as their classic unmistakeable dirt. The
Bassman is extremely versatile and has been used by tons of iconic guitarists from Mike
McCready, of Pearl Jam fame, all the way to Stevie Ray Vaughan himself. SKU # G1TWK942
The Blackface Princeton Reverb has been a staple in guitar tone since its inception in 1964. The
Princeton Reverb was essentially all the good parts of its predecessor, the Tweed Princeton, but
with a long-spring reverb and tube-driven tremolo circuit added. Over the years the Princeton
Reverb has worked its way into the gear repertoire of many renowned guitarists such as Ryan
Adams, Larry Carlton, Glen Campbell, and Tommy Tedesco. SKU # G1BPR108
One of our most popular amps, the Mojotone Deluxe Reverb Style Kit, is based on arguably
the most widely used guitar amp of all time. Just about every iconic guitarist imaginable has
played through a Deluxe Reverb at some point or another, but this amp has been specically
touted by artists such as Mike Campbell, Vince Gill, Jackson Brown, and even Elvis Costello.
SKU # G1BDR092
Class Type: Single Ended Class A All Tube Amplifier
Output: ~5W
Circuit: 5F1
Class Type: Class A/B all Tube Amplifier
Output: ~15 watts
Circuit:5E3
Class Type: A/B all Tube Amplifier
Output: ~40 watts
Circuit: 5F6-A
Class A/B All Tube Amplifier
Output: ~12-15 Watts
Circuit: AA1164
Class Type: A/B All Tube Amplifier
Output: ~22 Watts
Circuit: AB763
Readyforyournextbuild?
Bias Type: Cathode Biased
Build time: 4 hours
Difficulty:
Bias Type: Cathode Biased
Build Time: 5 hours
Difficulty:
Bias Type: Fixed
Build Time: 6 hours
Difficulty:
Bias Type: Fixed
Build Time: 5 hours
Difficulty:
Bias Type: Fixed with an adjustable bias potentiometer
Build Time: 7 hours
Difficulty:
www.mojotone.com 19
BRITISH 18 WATT STYLE 1X12 COMBO
BRITISH 45 STYLE 2X12 COMBO
BROWNFACE DELUXE STYLE COMBO
BRITISH 800 STYLE AMP
BLACKFACE SUPER REVERB®STYLE COMBO
TWEED TWIN 5E8-A LOW POWER STYLE COMBO
If you are looking for an amplier that is compact, lightweight, but powerful, this is the jewel
for you. It produces beautiful cleans and one of the best distortion tones ever produced. The
18 watt amplier is the epitome of perfect vintage Marshall® tone. SKU # G1BCK212
This was the rst amplier Marshall® ever built, based off of the 5F6A circuit. Favored by
blues and rock guitarists, this amp can produce a warm sustain and elegant clean tones,
with a pronounced rectier “sag.” Played by guitar greats such as Angus Young and Gary
Moore. SKU # G145C228
Our Brownface Deluxe Style kits are modeled after the brown era model 6G3 from the
earlier 1960s. Great for recording or small gigs. The amp can go from a tweed clean/dirty
to a british style overdrive with the turn of the volume knob. Includes bias modulated
tremolo. SKU # G1BFD067
This kit produces similar tones to a 81-90 Marshall® JCM800 2204. SKU # G1800969
Few amps have rivaled the commanding image and sound of the Super Reverb. Since its
introduction in 1963, the Super Reverb has remained highly sought-after due to its unique
tonal qualities and extreme versatility. Having a use on stages of all sizes and in any studio
situation, the Mojotone Super Reverb style amp has the potential to handle literally any
task at hand. SKU # G1BSR125
Mojotone’s Tweed Twin Low Power Style Amp Kit is a complete tonal powerhouse.
Sporting 45 Watts of power, the amp has all the sweet, vocal qualities and rich dynamic
response as the original. Known for being a plug-and-play amp, the 5E8-A circuit has
been used most notably by Eric Clapton and has been said to ‘cut’ more than its higher
powered counterpart (Tweed Twin High Power). SKU # G1TTL031
Class TYPE: A/B All Tube Amplifier
Output: ~18 Watt
Circuit: 1974
Class TYPE: A/B all Tube Amplifier
Output: ~45 watts
Circuit: M45
Class TYPE: AB all tube amplifier
Output: ~15 watts
Circuit: 6G3
Class TYPE: A/B Tube Amplifier
Output: ~50 Watts
Circuit: 2204
Class TYPE: A/B Tube Amplifier
Output: ~40 Watts
Circuit: AB763
Class Type: AB all Tube Amplifier
Output: ~45 watts
Circuit: 5E8-A
Cathode Biased
Build Time: 6 hours
Difficulty:
Bias Type: Fixed Bias w/ adjustable potentiometer
Build Time: 6 hours
Difficulty:
Bias Type: Fixed Bias
Build Time: 5 hours
Difficulty:
Fixed Bias with an adjustable bias potentiometer
Build Time: 7 hours
Difficulty:
Bias Type: Fixed Bias w/ adjustable bias potentiometer
Build Time: 8 hours
Difficulty:
Bias Type: Fixed
Build Time: 6 hours
Difficulty:
This manual suits for next models
1
Table of contents
Other Mojotone Amplifier manuals
