Tweed Champ SCH
November 15, 2022 | Author: Anonymous | Category: N/A
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Description
THE MOJOTONE
TWEED CHAMP 5F1 STYLE COMBO AMP
ojotone’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.” “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.
M
The amp utilizes one 6V6 power tube and one 12AX7 preamp tube, giving the amp its famed lush harmonic composition. We chose chose our Mojotone American Vintage AV8C 15 Watt 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.5
SECTION 5:
CHASSIS PREPARATION PG.6
SECTION 6: SECTION 7:
TRANSFORMER WIRING PG.8 BOARD ASSEMBL ASSEMBLYY PG.10
SECTION 8:
BOARD INSTALLATION INTO CHASSIS PG.11
SECTION 9:
WIRING THE SOCKETS, JACKS & POTS PG.12
SECTION 10:
CAB PREP & SPEAKER INSTALLATION PG.14
SECTION 11:
INITIAL CHASSIS TESTING 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 © 2019 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, copy, reproduce, distribute, publish, display, perform, modify, modify, create derivative works, transmit, or in any other way exploit any part of copyrighted material without permission from Mojotone, LLC .
SECTION 1:
SAFETY 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 ME SAFETY GUIDELINES TOKEEP YOU SAFE AS YOU WORK:
Never work on a circuit while power is applied.
Be especially careful when you solder. A hot soldering iron can easily burn you.
circuit until the circuit Do not connect power to a circuit until is nished and you have carefully checked your
Always work in a well-ventilated space.
work (twice).
Have safety equipment such as a re extinguisher, If you smell anything burning, immediately
a rst-aid kit and a phone nearby.
disconnect the power and examine your circuit to nd out what went wrong.
Be patient! Rushing through any type of technical
Keep your work area dry and organized .
work just leads to frustration and compounds issues that can easily be avoided.
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.
SECTION 2:
Tools
CERTAIN TOOLS ARE REQUIRED TO SUCCESSFULLY BUILD YOUR AMP. THE FOLLOWING TOOLS ARE RECOMMENDED RECOMMENDED TO COMPLETE YOUR PROJECT:
½” Nut Driver
Sharpie Marker
Set of needle nose pliers (one with no grip and one
Ruler
with serrated edge)
Multimeter
Wire Cutters Lots of patience Wire Strippers Soldering Iron & Solder Adjustable Wrench Phillips Head Screwdriv Screwdriver er Drill with 3/16” drill bit and 5/32” drill bit
NEED A TOOL? DO YOU SEE SOMETHING ON THIS LIST THAT YOU DON’T HAVE? HAVE? TURN TO PAGE 20 FOR A FULL LIST OF TOOLS, PARTS AND KITS TO ADD TO YOUR WORK BENCH.
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3
(1) Pilot Light
(1) Indicator Lamp Assembly
(1) Three-Lug Three-Lug Ground
(1) Jewel Lens
(1) Speaker Jack
w/ hardware
RESISTORS
CAPACITORS
(1) 2w 470Ω
470Ω
16uF
220K
(1) .5w 220k
22K
(2) .5w 22k
(2) 6-321 / 2’’Screw&KepsNuts (1) 16µf 16µ f @ 475v Elect Electrolyt rolytic ic 8uF
(1) .5w 1m
1.5 K
(2) .5w 1.5k
100K
(2) .5w 100k
100Ω
(2) 8-32 1 / 4’’ Screw & Keps Nuts (6) 4-40 3 / 8’’ Screw & Keps Nuts
Carbon Composite
68K
(4) 4-40 1 / 4'' Screw & Keps Nuts
(2) .022µf .022µ f @ 600v Ora Orange nge Dro Drop p
(1) 2w 10k
4.7K
HARDWARE
0 . 0 2 2 u F
Metal Oxide
1M
(2) Rubber Grommets
w/ hardware
(2) 8µf @ 475v Elect Electrolyt rolytic ic
(2) 10-32 11 / 2’’ Screw & Keps Nuts WIRES
22 gauge Yellow Pre-Tinned 18 gauge Green Pre-Tinned
+
(2) .5w 68k (2) .5w 100Ω
25uF
(1) 25µf @ 50v Sprague Atom
22 gauge Black Stranded 22 gauge White Stranded
SECTION 4:
COMPONENT IDENTITY & ORIENTATION ENSURE ALL POLARIZED CAPS ARE IN THE CORRECT ORIENTATION WHEN INSTALLING ONTO THE BOARD.
THIS IS TYPI-
CALLY 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 SCHEMATIC AND WIRING DIAGRAM AND
PAY CLOSE ATTENTION WHEN ORIENTING YOUR POLARIZED CAPS.
POLARIZED
NON-POLARIZED
---
+
+
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5
SECTION 5:
Chassis preparation PLEASE NOTE: ALL
PARTS LISTED IN THE CHASSIS PREP SECTION START AT ONE END OF THE CHASSIS AND
COMPLETES ON THE OPPOSITE END, BOTH TOP AND BOTTOM.
Mount the power transformer
FLATTENED VIEW OF INSIDE OF CHASSIS FUSE HOLDER
using its pre-assembled hardware and
INDICATOR LAMP
your driver. The transformer will 1/2“ be nut recessed through the rectangular cutout in the “belly” of the chassis.
Install rubber grommets in holes for
POTENTIOMETER
INPUT JACKS
POWER TRANSFORMER
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 po power wer RUBBER GROMMETS
transformer (output transformer is not recessed). Install the transformer so that the Re Red d and Blue wires go through the grommet closest to the power transformer. The Yellow 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. tighten.
OCTAL TUBE SOCKETS 9-PIN TUBE SOCKET
5
6
2
6
8
3
1
8 9
7
4
8
3
5 7
4
7 1
5 2
2 4
1
GROUND LUG LU G 5Y3
6
3
SPEAKER 6V6
JACK
12AX7
Mount the fuse holder using its preassembled hardware and adjustable wrench. Install fuse.
Solder the two 100Ω resistors on the indicator lamp then mount it using its preassembled hardware and adjustable wrench. SIDE VIEW
1 AMP 1
FUSE
BOTTOM VIEW
6
BUILD. MODIFY. REPAIR.
CHASSIS CROSS-SECTIO CROSS-SECTION N FOR COMPONENT ASSEMBLY
- INDICATES CHASSIS EDGE POT. & KNOB
FUSE
INDICATOR
HOLDER
LAMP
Mount the potentiometer using its preassembled 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: Tip: When
mounting the pots, make sure the toothed locking washer goes between the potentio meter and the chass is. The flat washer will go on the outside of the chassis and the nut will tighten down. Once you have the pot securely installed, 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.
INPUT JACKS
SPEAKER JACK
Mount octal tube sockets 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. Solder a small piece of wire from the outer lugs to the center lug, so that all the terminals are now ground points.
Mount 9-pin tube sockets using (2) 4-40 1⁄4” screws Solder the 1M resistor on the input jack closest to the potentiometer. Mount the two input jacks using their pre-assembled hardware and 1/2” nut driver and adjustable wrench. Be sure to note their orientation on the wiring diagram.
and keps nuts and tighten down with adjustable wrench and screwdriver. Make sure to choose an orientation and keep it uniform throughout all 9-pin sockets.
9-PIN
1M
SOCKET
OCTAL SOCKET
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7
SECTION 6:
TRANSFORMER WIRING PLEASE NOTE: TO
ONLY
COMPONENT.
IT
MAKE IS
FINAL
BEST
TO
SOLDER ONLY
CONNECTIONS
SOLDER
EACH
IF
ALL
LEADS
ONE
TIME,
JOINT
ARE SO
CONNECTED UNLESS
ALL
COMPONENTS ARE IN PLACE, WAIT TO SOLDER.
POWER TRANSFORMER
FLATTENED VIEW OF INSIDE OF CHASSIS FUSE HOLDER
Twist all matching pairs of wires
INDICATOR LAMP
VOLUME 1M
J12A
J12A
coming out of the power transformer. 1 0 0 Ω
Measure length needed for each wire, allow yourself extra lead and cut
1 0 0 Ω
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
M O J O 7 6 0
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 pow er transformer. These wires carry AC voltage, so either wire can go to either pin 4 or 6.
FROM OUTPUT TRANS.
Measure, strip, and tin the two Yellow wires from the power
5
6
5
6 8 9
7
4
8
3 2
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
1
4
7
3
8
7 6
1
5 2
2 4
1
3
SPEAKER JACK
5Y3
6V6
12AX7
POWER TRANSFORMER SCHEMATIC
solder pin 8 yet.
RED (10”)
330V @ 75MA
Measure, strip and tin the 2 2 Green wires from the power transformer (6.3v tube lament). These will go to your indicator light with the (2) 100 Ω resistors to ground.
RED/YELLOW (10”) 0V BLACK (10”)
330V @ 75MA RED (10”)
Measure and strip the Black and White wires coming from the power transformer. 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)
GREEN (10”)
6.3V @ 4A 120V BLACK (10”)
YELLOW (10”)
5V AC @ 4A
Double check your wiring.
8
GREEN (10”)
YELLOW (10”)
BUILD. MODIFY. REPAIR.
OUTPUT TRANSFORMER SCHEMATIC
OUTPUT TRANSFORMER
Primary is Blue and Red. Secondary is
Yellow.
Solder the Blue wire from the output transformer to pin 3 of the 5Y3 octal socket closest to the rectier. rectier.
Connect the
Yellow
wire from the output
transformer to the tip lug of the speaker jack.
BLUE (5.5”)
5000 Ω RED (5.5”)
YELLOW (3.5”)
4 Ω LEAD GROUNDED TO CASE
The Red wire from the output transformer transformer will be soldered to the board once it has been installed.
Double check your wiring.
PRO Tip: SOLDERING BASICS SOLDERING IS AN ESSENTIAL SKILL FOR EVERY LEVEL OF AMP BUILDER. HERE ARE A FEW TIPS FROM THE AMP AMP PROS AT MOJOTONE.
SAFETY FIRST! THE SOLDERIN ING IRON TIP REACHES A TEMPER ERATURE OF 400˚ SO NEVER DIRECTLY TOUCH IT OR ANY COMPONENT C
THAT YOU ARE SOLDERING WHEN IT IS HEATED. ALWAYS WORK IN A WELL VENTILATED AREA.
Prepare the joint to be soldered, i.e. twist leads
Touch the iron directly on the joint to be soldered
together, hook leads into eyelets, etc.
for about two seconds to get it hot enough to melt the solder. Ensure all components in the joint are heated evenly.
Tin (apply (apply solder to) to) the tip of the soldering iron. This will keep it from oxidizing and prolong the life of your soldering tip. Wipe excess on sponge. Clean the tip often while soldering. This will help the iron heat more consistently and evenly. Be sure to use clamps or tweezers tweezers if needed to hold the components to be soldered soldered in place.
Touch the solder to the joint. As joint. As it melts let it ow onto the joint to create a solid bond. Lift the solder off rst rst and then remove the iron from the joint. Place soldering iron back into the holder holder..
SOLDER EXAMPLES
PROPER SOLDER
COLD SOLDER
PROPER SOLDER www.mojotone.com
COLD SOLDER
9
SECTION 7:
BOARDD ASSEM BOAR ASSEMBL BLYY
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. COMPLETED WITH COMPONENTS
220K
6 8 K
6 8 K
1 . 5 K
F u 6 1
F u 8
F u 8
Ω 0 7 4
F u 2 2 0 . 0
F u 5 2
+
2 2 K
4.7K
F u 2 2 0 . 0
K 0 0 1
K
1 0 0 K
22K
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
Once all components are in place on the front side of the board, ip the board over and start applying traces or jumper wires wires to the backside of the board. These are illustrated on
the leads under the bottom of the board bo ard to hold them in place.
your wiring diagram as striped lines connecting different eyelet holes. Use your yellow clothcovered wire and cut each piece to size. Insert leads and bend around front of eyelet board to secure them.
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. connec tion.
PRO Tip: Make a small hook with the wire so that the wire “hooks” into the eyelet. CROSS-SECTION CROSS-SECTIO N OF EYELET BOARD
10
1 . 5
BUILD. MODIFY. REPAIR.
BACK SIDE OF EYELET BOARD
Once jumper wires are in place, 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.
Once all components, jumpers, and leads are in place, place, start at one end of the board and begin soldering every eyelet hole. Make Sure you Sure you don’t have any bad or “cold” solder joints by lightly pulling each wire after solder has set.
PRO Tip: Use the included Wiring Diagram to approximate lead lengths
SECTION 8:
BOARD INST INSTALLA ALLATION TION INTO CHASSIS CHASSIS Hold your board up to the chassis roughly in the area it will need to be installed. M O J O
Locate the two small ber board mounting holes drilled into the chassis. With these in mind,
HOLES FOR BOARD MOUNTING
7 6 0
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.
Once you have identied a good orientation for the holes, hold the berboard in place and using www.mojotone.com
5
6
5
6 8 9
7
4
8
3 2
1
7
4
8
3
7
6
1
5 2
1
2 4
3
11
the left edge as a guide, make a small mark with a pencil or sharpie on the edge of your chassis as a guideline.
Holding the screws in place, insert the backboard
Insert the blank backboard into the chassis and
Repeat with main component board.
align its left edge with the sharpie / pencil guideline you just made.
Use the 6-32 keps nuts and hand tighten screws.
Once aligned, hold the backboard rmly in place,
Once in place, fasten down the screws and nuts using a screwdriver and adjustable wrench.
into the chassis, and push the mounting holes down over the screws.
tilt the chassis onto it’s side and use your sharpie / pencil guideline to mark the backboard through the mounting holes. COMPLETED COMPONENT
Using an 1⁄8” drill bit, create the mounting holes
BOARD
in your backboard.
Line backboard up with main component board and mark the component board through the holes in the backboard.
BACKER BOARD
the Be mounting Using bit, make holes inthe yoursame maindrill component board. careful when drilling that you do not drill through any components or clip them.
Tilt the chassis on it’s side and insert the 6-32 screws from the top of the chassis through to the outside.
SECTION 9:
WIRING THE SOCKETS, JACKS & POTS 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
PLEASE NOTE:
POWER TRANSFORMER END OVER. SOCKET WIRING
Follow the wiring diagram diagram and begin wiring the tubes sockets starting from the power tubes and work your way across the chassis towards the preamp tubes.
Connect the Green wire wire on on the right to one of the ground lugs on the input jack on the right. POWER CORD INSTALLATION
Strip about 5” of the outer insulation insulation of the power cord.
POTENTIOMETER & JACK WIRING
12
Follow the wiring diagram diagram and begin wiring the volume pot on the front of the chassis and work your way across the chassis towards the input jacks.
Insert stripped wires wires through the hole in the bottom left corner of the chassis next to the rectier tube.
Connect the Yellow wires wires to to the input jacks.
Use the strain relief to to clamp around the power cable about 2” before the portion of the power
BUILD. MODIFY. REPAIR.
INSIDE CHASSIS VIEW FOR WIRING PREVIOUSLY CONNECTED WIRES HAVE BEEN MADE TRANSLUCENT
INDICATOR LAMP
FUSE HOLDER
VOLUME 1M
J12A
J12A 1M
1 1 0 0 0 0 Ω Ω
220K
6 8 K
M O J O 7 6 0
1 . 5 K
F u 6
F u 8
1
F u 8
Ω 0 7 4
+
10 K
F u 2 2 0 . 0
F u 2 2 0 . 0
F u 5 2
2 2 K
5
6 8 K
K 0 0 1
1 . 5 K
1 0 0 K
22K
6
5
6 8 9
4
7
4
3
8
3
2
1
7 8
7 6
1
5 2
2 4
1
3
SPEAKER JACK
5Y3
6V6
that was stripped. Compress the strain relief and insert it into the chassis using an adjust wrench or needle nose pliers. Strip the Black wire wire in the power cord and solder it to the fuse holder.
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12AX7
Strip the White wire wire in the power cord and solder it to the right side of the power switch. Strip the Green wire wire in in the power cord and solder it to the grounded lug of the 3 lug terminal strip next to the power transformer. transformer.
13
SECTION 10:
CAB PREP AND SPEAKER INSTALLATION CABINET PREPARATION
Remove the upper and lower back panel of the
Ω 7
.
.
cabinet. 1
.7
Mounting holes for the chassis have already been drilled and are located on either side of the chassis cutout.
220K
6 6 8 8 K K
1 . 5 K
F u 6 1
F u 8
F u 8
Ω 0 7 4
F u 5 2
K
+
F u 2 2 0 . 0
F u 2 2 0 . 0
K 0 0 1
Test t your chassis into the cabinet.
Ω
4.7K
22K
7 4
.
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. careful! It’s easy careful! PRO Tip: Bethe stud through speaker cone.
to stick a speaker
Install and tighten the KEPS nuts. SPEAKER WIRE HARNESS ASSEMBLY
Twist the two 15” lengths of black and white 18ga. stranded wire together.
Push the insulation back 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 to outer bottom lip. 14
BUILD. MODIFY. REPAIR.
1 0 0 K
.
K
SAFETY FIRST!
u
1
4.7
1 . 5
K
2 2 K
. K
.
SECTION 11:
INITIAL CHASSIS TESTING Ensure all solder joints and connections are good.
Install the preamp tube, then power up the
Physically inspect every tube socket closely.
amplier and ensure the laments are working. Check the B+ voltages on pin 1 and pin 6 of the preamp tube.
Look and listen for loose hardware by shaking chassis.
Turn the amp a mp off and and install the output tube (6V6).
Ensure chassis is free from debris before plugging in.
Plug in the speaker.
Check for pinched or burnt wire insulation.
Power on the amp and check for proper lament operation.
Adjust lead dress so it is easy to see components. Check the voltages at the test points on the wiring the tubes installed. Power on amp without the
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.
Using a multimeter check the power transformer secondary AC voltages for 6.3v (at tube socket for laments). This will be pins 4,5 and 9 on preamps and pins 2 and 7 on the 6V6’s. 6V6’s.
Using a multimeter check for 5v on pins 2 and 8
PRO Ti:
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 t he power off immediately immediately if this happens.
of the rectier socket.
Let the amp idle on for half an hour or so for the
Turn off the amp a mp and install the rectier tube (5Y3). Turn on amp and allow it to warm up (approximately (appro ximately 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 r echeck your wiring.
chassis to be warm and do the bump test .
PRO Tip:
A bump test is 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.
Check the B+ voltages with on pin 8 on the rectier and pin 3 on the output tube socket. Turn off the amplier.
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15
SECTION 12:
CHASSIS INSTALLATION Install the 2 chassis mount screws into mount
Hold the upper back panel in place and slide
holes on top of cab. Turn Turn the cabinet upside down may make it easier for chassis installation.
the chassis back so it is ush against the back panel.
PRO TIP: TIP: Be
Remove the back panel and tighten down the
mindful of tweed and tolex when
installing. Use painter’s 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.
two chassis mount screws.
Check chassis alignment with the back panel in place, adjust as necessary.
Make sure you do not pinch any wires between
Plug speaker into speaker jack..
the chassis screws/nuts, chassis and cabinet. Do not over-tighten the chassis screws as it may deform and weaken the cabinet.
Install the cord strain relief to the side of the cabinet using #6 screw.
Place the chassis into the cabinet, lining up
Install the upper and lower back panels . Do
holes with mount screws.
not over-tighten the 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.
6V6
5Y3
12AX7
PLUG SPEAKER CHASSIS REAR PANEL
12AX7
16
CABLE HERE
J11
6V6
BUILD. MODIFY. REPAIR.
5Y3
SECTION 13:
SOUND TEST Turn on the amp and let it warm up. After warm-up, ensure the tubes are not “red plating. plating.”” Rotate all controls fully and listen for noise. It is normal to have some noise at high volume levels. Plug in an instrument cable and listen for any crackle, pops, strange oscillations or feedback. Leave on for a while so the tubes and components can “burn in” - (not literally) ROCK OUT!!
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.
SECTION 14:
TROUBLESHOOTING 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 BACKWARDS, ETC.. HERE ARE A FEW RESOURCES WE SUGGEST.
If the amplier oscillates or make s loud feedback noise that is not controllable by the volume, turn off the amplier and unplug it from the wall. After the lter capacitors have drained, always double check with a multimeter before proceeding, switch the red (going to the eyelet board from the output transformer) and the blue wire (going to pin 3 on the 6V6). 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 non-electronic tech’s tech’s guide to understanding basic tube ampliers 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
• Tube Guitar Amplier Essentials and All About Vacuum Tube Tube Guitar Ampliers by Gerald Weber Truly must read books by Gerald Weber for any amp tech. You can purchase these at Mojotone. • By Aspen Pitman. The T Tube ube Amp Book A great resource resource for schematics schematics and basic tube info. Comes with DVD DVD that has over 800 schematics of vintage tube amp technology. • RCA Tube Receiving Manual This is one of the books that really started the guitar amp craze. www.mojotone.com
17
Ready for your your next next build? TWEED CHAMP 5F1 STYLE COMBO Mojotone’s Tweed Champ Style Amp Kit is based on the beloved 5 watt amp from the 1950s. These amps were were perfect for recording and were featured 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, “Layla. platform, this amp delivers warm tones that are harmonically rich and have a beautiful low volume crunch. SKU # G1TCK910 Class Type: Single Ended Class A All Tube Amplifier Output: ~5W Circuit: 5F1
Bias Type: Cathode Biased Build time: 4 hours Difficulty:
TWEED DELUXE 5E3 STYLE COMBO Mojotone’s Tweed Deluxe Style Amp is based on the popular 5E3 circuit from the 1950s and is by far our most popular amplier. 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 of Tube BillyAmplifier Gibbons, Neil Young, Young, Felder, Biased and Larry Carlton. SKU # G1FTD819 Class Type: Classlikes A/B all Bias Don Type: Cathode Output: ~15 watts Circuit:5E3
Build Time: 5 hours Difficulty:
MOJOTONE TWEED BASSMAN 5F6-A STYLE COMBO Mojotone’s Tweed 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. circuits. These 40 Watt amps are known for their bold and pristine clean sounds as well as their classic classic unmistakable 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 Class Type: A/B all Tube Amplifier Output: ~40 watts Circuit: 5F6-A
Bias Type: Fixed Build Time: 6 hours Difficulty:
BLACKFACE Princeton REVERB® The STYLE COMBO Blackface Princeton Reverb has been a staple in guitar tone ton e since its inception in 1964. The Princeton Reverb was essentially all the good parts of its predecessor, pre decessor, 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 Class A/B All Tube Amplifier Output: ~12-15 Watts Circuit: AA1164
Bias Type: Fixed Build Time: 5 hours Difficulty:
BLACKFACE DELUXE REVERB® STYLE COMBO 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 guitarist imaginable has played through a Deluxe Reverb at some point or another, but this amp has been specically spe cically touted by artists such as Mike Campbell, Vince Gill, Jackson Brown, and even Elvis Costello. SKU # G1BDR092 Class Type: A/B All Tube Amplifier Output: ~22 Watts Circuit: AB763
18
BUILD. MODIFY. REPAIR.
Bias Type: Fixed with an adjustable bias potentiometer Build Time: 7 hours Difficulty:
BRITISH 18 WATT WATT STYLE 1X12 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 The 18 watt amplier is the epitome of perfect vintage Marshall® tone. SKU # G1BCK212 Class TYPE: A/B All Tube Amplifier Output: ~18 Watt Circuit: 1974
Cathode Biased Build Time: 6 hours Difficulty:
BRITISH 800 STYLE AMP This kit produces similar tones to a 81-90 Marshall® JCM800 2204. SKU # G1800969 Class TYPE: A/B Tube Amplifier Output: ~50 Watts Circuit: 2204
Fixed Bias with an adjust adjustable able bias potentiometer Build Time: 7 hours Difficulty:
BRITISH 45 STYLE 2X12 COMBO 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 Class TYPE: A/B all Tube Amplifier Output: ~45 watts Circuit: M45
Bias Type: Fixed Bias w/ adjustable adjustable potentiometer Build Time: 6 hours Difficulty:
BLACKFACE SUPER REVERB® STYLE COMBO Few amps have have rivaled 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. 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 Class TYPE: A/B Tube Amplifier Output: ~40 Watts Circuit: AB763
Bias Type: Fixed Bias w/ adjustable adjustable bias potentiometer potentiometer Build Time: 8 hours Difficulty:
BROWNFACE DELUXE STYLE COMBO
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 Class TYPE: AB all tube amplifier Output: ~15 watts Circuit: 6G3
Bias Type: Fixed Bias Bias Build Time: 5 hours Difficulty:
TWEED TWIN 5E8-A LOW POWER STYLE COMBO 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. original. Known for being a plug-and-play plug-and-play amp, the 5E8-A circuit circuit has been usedcounterpart most notably by Eric Clapton and hasSKU been said to ‘cut’ more than its higher powered (Tweed Twin High Power). # G1TTL031 Class Type: AB all Tube Amplifier Output: ~45 watts Circuit: 5E8-A
Bias Type: Fixed Build Time: 6 hours Difficulty: www.mojotone.com
19
the workbench
T oolsthe P ros use
WORKBENCH TESTED. AMP PRO APPROVED.
YEARS OF EXPERIENCE AND ENDLESS PASSION HAVE DRIVEN OUR TEAM AT MOJOTONE TO CREATE THE QUALITY PRODUCTS THAT WE OFFER. NOW YOU CAN USE THE TOOLS THAT WE DO IN YOUR SEARCH SEARCH FOR THE PERFECT TONE. MOJOTONE AMPLIFIER CHASSIS STAND SKU# N4CHS021
WELLER WTCPT TEMPERATURE CONTROLLED SOLDERING STATION SKU# N4TOL110
SKU# 1000015a
XCELITE 6-PIECE PRECISION SCREWDRIVER SET SKU# N4TOL125
WELLER ANTI-STATIC DE-SOLDER PUMP SKU# N4TOL085
XCELITE ELECTRICAL CUTTING AND STRIPPING PLIERS SKU# N4TOL113
KESTER ‘’44’’ ROSIN CORE SOLDER
MOJOTONE SYG A830L DIGITAL MULTIMETER SKU# 4152015
MOJOTONE PICKUP WINDING MACHINE SKU# 4152015
GROOVETECH JACK/POT WRENCH
RENE MARTINEZ 24-PIECE MICRO-TIP SCREWDRIVER SET
SKU# Q2GTJPT1757
SKU# Q2GTJPT1757
XCELITE SERRATED LONG REACH PLIERS SKU# N4TOL116
CONTACT & ORDERING INFO
800-927-6656
XCELITE 6” LONG NEEDLE NOSE PLIERS SKU# N4TOL124
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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, Disclaimer: Mojotone, LLC disclaims 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.
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