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Summary of Contents for Mojotone TMB
- Page 2 The 18watt TMB is based on the Two EL84s give the amp’s normal channel a warm and circuit used in vintage Marshall models 1958, 1973, and round character which, when the volume is pushed higher, 1974 (more affectionately known as the ‘18-watters’.)
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Page 3: Table Of Contents
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, reproduce, distribute, publish, display, perform, modify, create deriva-... -
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 Be especially careful when you solder work on a circuit while power is applied. -
Page 5: Parts Inventory
*optional based on order (1) Void Free Birch Head Cabinet* (1) Faceplates (front & back)* (1) Void Free Birch Combo Cabinet* (1) Aluminum Chassis (1) Mojotone British Vintage (1) British Style 18 Watt (1) British Style 18 Watt EL 84 EZ 81 (1) Turret Board 30w, 12“, 8Ω... -
Page 6: Component Identity & Orientation
RESISTORS CAPACITORS (2) Sprague Atom Carbon Composite Silver Mica 25µf @ 50V W 1M (1) 47pf @ 500V (1) Mojotone W 2.7k Electrolytic KingCap W 5.1k (2) 500pf @ 500V 16µf @ 475V W 10K W 47k Mojotone Dijon... -
Page 7: Chassis Assembly
SECTION 5: Chassis ASSEMBLY 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 INDICATOR MAINS SWITCH STANDBY J1 JACK LAMP... - Page 8 CHASSIS CROSS-SECTION FOR COMPONENT ASSEMBLY POWER & STANDBY POTENTIOMETER INPUT JACKS 9-PIN SWITCH & KNOB SOCKET FACEPLATE CHASSIS INDICATOR LAMP CHASSIS CROSS-SECTION FOR CAN CAP. ASSEMBLY The faceplate will be secured by the washers and nuts from the components being mounted through MOUNTING FROM OUTSIDE CHASSIS it.
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Page 9: Transformer Wiring
SECTION 6: TRANSFORMER WIRING 500 K 25 K 250 K 500 K 500 K 500 K FROM OUTPUT TRANS. POWER PHASE INVERTER PREAMP TUBE SOCKETS TUBE SOCKET TUBE SOCKETS EL84/6BQ5 ECC83/12AX7 ECC83/12AX7 R E C T I F I E R T U B E S O C K E T EZ81 socket closest to the power transformer. - Page 10 FOR 240V OPERATION: USE BLACK LEAD AND BLACK/RED LEAD SOLDERING BASICS pro tip: 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˚...
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Page 11: Component Wiring
SECTION 7: Component wiring 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 be- 500 K 25 K tween the positive (+) terminals on the can capacitor mounted from the outside. - Page 12 PRO Tip: When a capacitor and resistor are both Once all components, jumpers, and leads are in running between the same turrets, you can twist place, start at one end of the board and begin sol- their leads, one around the other, and solder to dering every turret.
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Page 13: Wiring The Sockets, Jacks & Pots
Locate the four small pre-drilled holes in the COMPLETED chassis for mounting the turret board. Install TURRET BOARD a turret board standoff on each hole using the STANDOFFS 1/4‘‘ 4-40 screws. Line the mounting holes on the turret board with the turret board standoffs and secure using the 1/4‘‘... - Page 14 TUBE SOCKET FILAMENT WIRING TUBE SOCKET WIRING 47 pF POTENTIOMETER WIRING 500 K 25 K 250 K 500 K 500 K 500 K CAN CAPACITOR WIRING: INPUT JACK WIRING Prepare the wire and connect Blue from the can cap mounted between the rectifier tube and power tube, to 500 K 500 K...
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Page 15: Rear Panel Component Installation & Wiring
47 pF CAN CAPACITOR 32µF + 32µF @500V SECTION 10: REAR PANEL COMPONENT INSTALLATION AND WIRING RECTIFIER TUBE FROM INDICATOR LAMP 9 PIN SOCKET CAN CAPACITOR EL84 32µF + 32µF FROM MAINS SWITCH FROM OUTPUT TRANSFORMER @500V FROM POWER TRANSFORMER POWER TUBE PHASE INVERTER 9 PIN SOCKETS... -
Page 16: Initial Chassis Testing
Remove the four mounting screws from the speak- With a pair of needle nose pliers, take the tinned wire and make a small “hook” on both the white & er baffle. black wires. With the cabinet laying face down, place the speaker on the baffle, line up the speaker mounting Insert the white wire “hook”... -
Page 17: Chassis Installation & Final Assembly
arcing or smoke from any component or transformer. the Standby switch to ON. Check the B+ voltages If you see anything, shut down the amp immediate- on pin 1 and pin 6 of the preamp tubes. ly. Disconnect the amplifier from wall socket, check voltages on the filter capacitors (DC voltage), make Turn the amp back to Standby and then turn off the sure they are drained, and then recheck your wiring. -
Page 18: Troubleshooting
Comes with DVD that has over 800 schematics of vin- YOU HAVE JUST BUILT YOUR VERY OWN MOJOTONE 18WATT TMB. THERE IS ONLY ONE ON THE PLANET THAT IS LIKE YOURS. WE HOPE tage tube amp technology. YOU HAVE ENJOYED THIS EXPERIENCE AND GAINED KNOWLEDGE TO HELP YOU... - 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 re- cordings 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 dam-...
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