Related Manuals for StewMac '81 BRIT-800
Summary of Contents for StewMac '81 BRIT-800
- Page 1 ’81 BRIT-800 A M P L I F I E R K I T ORIGINAL BRITISH CIRCUIT The king of shred A S S E M B LY I N S T R U C T I O N S With loads of helpful tips!
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Page 2: Table Of Contents
COPYRIGHT WARNING This material is protected by copyright and has been created by and solely for the purposes of StewMac . You may not sell, alter or further reproduce any part of this material, or distribute it to any other per- son . -
Page 3: About This Iconic Amp
. StewMac ICON KITS bring classics that are no longer made, or are simply unaffordable, within reach . And the best part is you get to build them with your own hands . -
Page 4: How To Build This Kit
Gain Processing Gain Gain You don’t need to read the schematic, but it’s fun! See how your guitar’s signal gets processed into sound Negative Feedback page #10735 © 2019 StewMac Resistor Potentiometers Diode Transformer Jack Ground Shielded Capacitor Electrolytic Cap. -
Page 5: Parts List
(4) 4-40 threaded standoff, 1/2" (1) Chassis (10) 4-40 machine screw, 3/8" (1) Turret board (14) 4-40 machine screw, 1/4" (16) 4-40 locknut (1) Faceplate/backplate set (3) Filter cap mounting clamp (1) Small rubber grommet (4) Large rubber grommet stewmac.com © 2019 StewMac... - Page 6 (1) White heater wire (2) Ground tab (1) Black heater wire (1) Bare copper bus wire (1) Power cord Heat-shrink tubing Transformers (2) 1/8” diameter (2-1/2” length) (1) Power transformer (1) Output transformer (1) Filter choke stewmac.com © 2019 StewMac...
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Page 7: Tools And Supplies
Drill with a 5/32" bit #3000 For mounting turret board and filter cap Guitar Tech Screwdriver Set Ruler Item #4905 StewMac Shop Rule Digital multimeter Item #3618 Fieldpiece Pocket Multimeter Snuffer stick (bleed resistor) Item #1552 Snuffer Stick #1606 Pencil... -
Page 8: Amp Voltages Are Seriously Dangerous
To discharge a capacitor, clip the snuffer stick lead to ground—preferably a mounting bolt on the power transformer . Hold the tip of the stick to the cap’s positive lead and use your multimeter to watch the voltage drain to less than 18V . stewmac.com © 2019 StewMac... -
Page 9: How To Read Resistor Values
. K = 1,000 Installing capacitors with the polarity backwards will make the circuit malfunction and quickly destroy the capacitor— even causing it to explode . Read this band first (closest to an end) stewmac.com © 2019 StewMac... -
Page 10: Complete Wiring Diagram
. Your amp-building skills will get stronger with each step! Our diagrams show a flat view of the metal chassis stewmac.com © 2019 StewMac... -
Page 11: Prepping The Turret Board
. A good solder joint wire ends . Push-back wire works best is shiny—a sign that it was left to cool when you strip away about 1/4" of the undisturbed . cloth wrap . stewmac.com © 2019 StewMac... - Page 28 .68 F .022 F .022 F...
- Page 30 .022 F .022 F 5W 10K .022 F .01 F .022 F .022 F 5W 10K...
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Page 42: Installing Parts And Preparing For Testing
500mA fuse in DON’T INSTALL THE TUBES YET! the H . T . fuse socket . DON’T PLUG THE AMP IN YET! The next page is going to keep you out of trouble! stewmac.com © 2019 StewMac... -
Page 43: Testing And Troubleshooting
ON . The power switch should your connections . light up . Let the amp warm up for a few minutes and then flip the standby switch to ON . Again, if you get smoke or smells, unplug immediately . stewmac.com © 2019 StewMac... - Page 44 . Plug the amp in and flip the power switch ON . Give the tubes 30 seconds to warm up and then flip the standby switch to ON as well . stewmac.com © 2019 StewMac...
- Page 45 ON . begin probing for loose connections: VHT Bias Tester (StewMac #1580) . Watch the bias meter as the power from the input jacks to the This method starts with a simple tubes heat up .
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Page 46: Final Assembly
StewMac is here to help the sound is 100% JCM800 . screws through the floor of the For more than fifty years, StewMac World renowned for that sizzling in- chassis . Tighten the screws down to has supplied instrument builders and your-face crunch, this amp is actually hold the chassis tight to the cabinet . -
Page 47: Photograph Of Completely Wired Chassis
© 2019 StewMac... -
Page 48: Learning More: Secrets Revealed In The Schematic
. part of the amplifier, the first pre-amp tube in the Gain stage . stewmac.com © 2019 StewMac... -
Page 49: Circuit Schematic
© 2019 StewMac... -
Page 50: More Iconic Amp Kits From Stewmac
. It’s all here: clarity, distortion, and rectifier tube sag . D I F F I C U LT Y H O U RS : #10737 22 WATTS / 12" SPEAKER / ORIGINAL AB763 CIRCUIT stewmac.com © 2019 StewMac... - Page 51 This isn't a pocket-sized digital simulation; this is the real deal! Listen to Dick Dale’s “Misirlou" while doing this easy build . D I F F I C U LT Y #10733 ORIGINAL 6G15 CIRCUIT H O U RS : stewmac.com © 2019 StewMac...
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Page 52: Full Page Wiring Diagram
.68 F .022 F .022 F .022 F .022 F 5W 10K .022 F .01 F .022 F .022 F 5W 10K stewmac.com © 2019 StewMac... -
Page 53: Tube Replacement Chart
A M P L I F I E R K I T O R I G I N A L B R I T I S H C I R C U I T DANGER: Unplug the amp before changing tubes. Tube locations from left to right: EL34 EL34 12AX7 12AX7 12AX7 (ECC83) (ECC83) (ECC83) stewmac.com © 2019 StewMac... - Page 54 © 2019 StewMac...
- Page 55 © 2019 StewMac...
- Page 56 StewMac tools + ideas for guitarmaking 21 N . Shafer St ., Athens, OH 45701 800-848-2273 stewmac .com ©2019 StewMac . All rights reserved . #10735 Updated June, 2019...
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