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Summary of Contents for Mojotone Tweed Champ
- Page 2 THE MOJOTONE ojotone’s Tweed Champ Style Amp Kit is based on the beloved 5 watt amp from the 1950s. These amps were TWEED CHAMP perfect for recording and were featured on a wide array of recordings from Joe Walsh’s “Rocky Mountain Way” all the way to Derek &...
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Page 3: Table Of Contents
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... -
Page 4: Safety
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 SAFETY GUIDELINES TO KEEP YOU SAFE AS YOU WORK: Never •... -
Page 5: Parts Inventory
SECTION 3: PARTS INVENTORY *optional based on order (1) Chrome Chassis 12AX7 12AX7 (1) Solid Pine Cabinet* (1) 10'' Install Power Cord (1) 8'' Jensen C8R 25w 4Ω Speaker* (1) MOJO 760 Power Transformer (1) NOS 771 Output Transformer (1) Eyelet Board & Backer Board w/ hardware 4 7 0Ω... -
Page 6: Component Identity & Orientation
(1) Pilot Light (1) Three-Lug Ground (1) Indicator Lamp Assembly (1) Jewel Lens (1) Speaker Jack (2) Rubber Grommets w/ hardware w/ hardware RESISTORS CAPACITORS HARDWARE (4) 4-40 '' Screw & Kep Nuts (1) 2w 4.7k Metal Oxide (2) 8-32 ’’... -
Page 7: Chassis Preparation
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. FLATTENED VIEW OF INSIDE OF CHASSIS Mount the power transformer FUSE INDICATOR using its pre-assembled hardware and... - Page 8 CHASSIS CROSS-SECTION FOR COMPONENT ASSEMBLY - INDICATES CHASSIS EDGE POT. & INPUT JACKS SPEAKER JACK KNOB FUSE INDICATOR HOLDER LAMP Mount the potentiometer Mount octal tube sockets and tension clamp using its pre- assembled hardware and 1/2” nut driver. using the (4) 3⁄8” 4-40 screws and keps nuts. When Make sure potentiometers are mounted with mounting, be sure to choose an orientation and their lugs facing up towards the open end of...
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Page 9: Transformer Wiring
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. POWER TRANSFORMER FLATTENED VIEW OF INSIDE OF CHASSIS FUSE INDICATOR... - Page 10 SOLDERING BASICS 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 ˚ SO NEVER DIRECTLY TOUCH IT OR ANY COMPONENT THAT YOU ARE SOLDERING WHEN IT IS HEATED.
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Page 11: Section 7: Board Assembly
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. COMPLETED WITH COMPONENTS 1.65V 4 . 7K 370V 325V 275V 165V... - Page 12 BACK SIDE OF EYELET BOARD 1.65V 1.65V 165V 165V 275V 325V 370V Once jumper wires are in place, follow wiring Once all components, jumpers, and leads diagram to create leads where necessary. are in place, start at one end of the board and These will be the wires that go out from the begin soldering every eyelet hole.
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Page 13: Board Installation Into Chassis
SECTION 8: BOARD INSTALLATION INTO CHASSIS Hold your board up to the chassis Repeat with main component board. roughly in the area it will need to be installed. Use the 6-32 keps nuts and hand tighten screws. Locate the two small fiber board mounting Once in place, fasten down the screws and nuts holes drilled into the chassis. -
Page 14: Wiring The Sockets, Jacks & Pots
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. FUSE INDICATOR VOLUME 1M... -
Page 15: Initial Chassis Testing
SECTION 10: INITIAL CHASSIS TESTING Ensure Check the B+ voltages with all solder joints and connections are good. on pin 8 on the rectifier and pin 3 on the output tube socket. Turn Physically inspect every tube socket closely. off the amplifier. Look and listen Install the preamp tube, for loose hardware by shaking... -
Page 16: Cab Prep & Speaker Installation
SECTION 11: CAB PREP AND SPEAKER INSTALLATION CABINET PREPARATION Remove the upper and lower back panel of the cabinet. Mounting holes for the chassis have already 4.7K been drilled and are located on either side of the chassis cutout. Test fit your chassis into the cabinet. SAFETY FIRST! THE TUBES WILL BE HOT IF THE AMP WAS RECENTLY ON. -
Page 17: Chassis Installation
SECTION 12: CHASSIS INSTALLATION Install the 2 chassis mount screws Hold the upper back panel in place into mount and slide holes on top of cab. Turn the cabinet upside down the chassis back so it is flush against the back panel. may make it easier for chassis installation. Remove the back panel PRO TIP: and tighten down the Be mindful of tweed and tolex when... -
Page 18: Troubleshooting
RESOURCE LITERATURE Tube Guitar Amplifier Essentials and All About Vacuum Tube Guitar Amplifiers • by Gerald Weber Truly must read books by Gerald Weber for any amp tech. You can purchase these at Mojotone. The Tube Amp Book • 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. - Page 19 Ready for your 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 perfect for recording and were featured on a wide array of recordings from Joe Walsh’s “Rocky Mountain Way”...
- Page 20 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...
- Page 21 137 WORTH BEVERAGE DR. , BURGAW, NC 28425 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 fitness for any particular purpose. MojoTone, LLC will not be liable for damages...
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