StewMac ’66 D-REVERB Assembly Instructions Manual
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StewMac ’66 D-REVERB Assembly Instructions Manual

22w combo amp kit original ab763 circuit
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'66 D-REVERB
C O M B O A M P K I T
ORIGINAL AB763 CIRCUIT
A S S E M B LY I N S T R U C T I O N S
Famously clean with
enough guts to gig!
With loads of
helpful tips!
22W

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Summary of Contents for StewMac ’66 D-REVERB

  • Page 1 ’66 D-REVERB C O M B O A M P K I T ORIGINAL AB763 CIRCUIT Famously clean with enough guts to gig! A S S E M B LY I N S T R U C T I O N S With loads of helpful tips!

  • 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

    . It’s all here: clarity, distortion, and rectifier tube sag . 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

    TR2: 125C3A Input Output TR3: 125A1A REVERB REVERB UNIT TR4: 125A20B PEDAL 1 amp To tube heaters slow-blow fuse and pilot light #10733 © 2018 StewMac Resistor Capacitor Potentiometers Diode Transformer Jack Ground Shielded Preamp tube Power tube Rectifier tube...

  • Page 5: Parts List

    (1) Black wood screw (3) Insulator boards (1) Power cord clamp (1) Faceplate/backplate set (1) Strain relief for power cord (6) Rubber grommet (1) 12” speaker (2) Chassis mounting strap (4) Chassis strap screw and nut stewmac.com © 2019 StewMac...
  • Page 6 (1) Filter choke the insulation back instead of trimming it. BUT: Trimming it still works better! Reverb Heat-shrink tubing (1) Reverb tank (2) 1/8" diameter (1) Reverb tank bag (1) Reverb wiring kit (1) Footswitch stewmac.com © 2019 StewMac...

  • Page 7: Tools And Supplies

    Drill with a 5/32", 5/64", and 1/4" bit #3000 For mounting eyelet 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...

  • 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

    Installing capacitors with the polarity backwards will make the circuit malfunction and quickly destroy the capacitor— even causing it to explode . x1,000 +/- 5% +/- 5% Blue Gray Orange Gold K = 1,000 Read this band first (closest to an end) stewmac.com © 2019 StewMac...

  • Page 10: Prepping The Cabinet

    . keep them neat . to mark the depth, or use a StewMac On the black and white speaker leads, Push the insulation back 3/8" and Depth-stop Drill Bit (item #1712) .
  • Page 11 Cut out the tube replacement chart on page 63 . Put a thin coat of glue or Criss-cross contact cement on the back and glue tightening it to the inside wall of the cabinet . prevents warping. stewmac.com © 2019 StewMac...

  • Page 12: Prepping The Eyelet Boards

    Drill a third 1/4" hole centered be- rest of the holes . tween eyelets P and R (hole Q) . Separate the boards and set the insu- lator board aside . stewmac.com © 2019 StewMac...

  • Page 13: Tips For Great Soldering

    Also tin component leads like multi- is shiny—a sign that it was left to cool when you strip away about 1/4" of the strand wires to help the solder flow . undisturbed . cloth wrap . stewmac.com © 2019 StewMac...
  • Page 14 OUTPUT TRANSFORMER (Mounted outside)

  • Page 54: Installing Parts And Preparing For Testing

    PLUG THE AMP IN YET! covering the filter cap board . and install the knob so that the The next page is going to keep indicator line points to number 1 . you out of trouble! stewmac.com © 2019 StewMac...

  • Page 55: Testing And Troubleshooting

    Measure the DC voltage at eyelet 46 your connections . for your B+ voltage . This should be roughly 490V DC . Turn the power and standby switches to OFF and unplug the amp . stewmac.com © 2019 StewMac...
  • Page 56 35 to eyelet 62 . stewmac.com © 2019 StewMac...
  • Page 57 Step 165 . is by using a bias meter, such as the tubes have cooled, remove them from VHT Bias Tester (StewMac #1580) . The old-school way of adjusting the their sockets . bias is by ear: after setting the bias...

  • Page 58: Final Assembly

    . It usually takes just a minor wiring ad- justment, perhaps resoldering a loose joint, to correct this sort of distortion .  stewmac.com © 2019 StewMac...

  • Page 59: Tips For Using The 66D

    StewMac is here to help! 6 . If you’re using single-coils, maybe For more than fifty years, StewMac bump the bass up a bit more, and give has supplied instrument builders and humbuckers a little more treble .

  • Page 60: Learning More: Secrets Revealed In The Schematic

    As the signal from the guitar becomes more amplified, the ripple of DC current transformer . becomes less evident and the fully filtered current is sent to the most sensitive part of the amplifier, the first pre-amp tube in the Gain stage . stewmac.com © 2019 StewMac...

  • Page 61: Circuit Schematic

    Power stewmac.com © 2019 StewMac...

  • Page 62: 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 63 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...

  • Page 64: Complete Wiring Diagram

    © 2019 StewMac...

  • Page 65: Tube Replacement Chart

    DANGER: Unplug the amp before changing tubes. Tube locations from left to right: 5AR4 12AT7 12AX7 12AX7 12AT7 12AX7 12AX7 (GZ34) (ECC81) (ECC83) (ECC83) (ECC81) (ECC83) (ECC83) Use only 1-amp slow-blow fuse, size 5mm x 20mm. #10737 stewmac.com © 2019 StewMac...
  • Page 66 © 2019 StewMac...
  • Page 67 © 2019 StewMac...
  • Page 68 StewMac tools + ideas for guitarmaking 21 N . Shafer St ., Athens, OH 45701 800-848-2273 stewmac .com ©2019 StewMac . All rights reserved . #10737 Updated February, 2019...

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