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StewMac NYC BIG MUFF PI Instructions Manual

Tone bypass mod
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NYC BIG MUFF PI
TONE BYPASS MOD
INSTRUCTIONS

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Summary of Contents for StewMac NYC BIG MUFF PI

  • Page 1 NYC BIG MUFF PI TONE BYPASS MOD INSTRUCTIONS...
  • Page 2 This mod is only intended for the big box NYC Big Muff Pi pedals released in the 2000's. If you run into issues with this modification, a StewMac tech advisor is a click or call away: stewmac.com/contactus or 1.800.848.2273 Big Muff is a registered trademark of New Sensor Corp.

  • Page 3: Parts List

    #1606 [ 2] 1/8" heat shrink - 2" length Wire Cutter [ 1] Mini toggle switch #1607 1/4" Drill Bit #4850 [ 1] NYC Big Muff Pi Tone Bypass Mod instructions Kester Pocket-Pak Solder #0505 Solder Sucker #0503 Solder Wick...
  • Page 4 CONNECTING THE NEW SWITCH For your new switch to be connected properly, an understanding of tinning and soldering is necessary. TINNING Tinning is an important part of the soldering process as it helps to make stronger solder joints. Tinning a wire is done by heating the wire with a soldering iron and then melting a layer of solder on it.
  • Page 5 MORE HELPFUL SOLDERING SOLDERING TIPS AND TRICKS • Keep your soldering tip clean by wiping it often Hold the tip against the connection on a damp sponge. until the connection reaches soldering temperature. This should take just a • Also keep it tinned by few seconds.
  • Page 6 DESOLDERING Much like soldering, you run the risk of damaging the circuit board while desoldering. If too much heat is applied to a circuit board the solder pad can pull away from the board, breaking its electrical connection. A solder sucker and solder wick are your best friends when desoldering. Here are a few tips on how to use them: 1.
  • Page 7 DISASSEMBLE THE PEDAL Remove the four screws that secure the back of the pedal housing. As you are removing the back panel, be careful not AMPLIFIER to catch the circuit board on any of the wires. If your pedal has a glued LED light, do not remove it.
  • Page 8 DRILL A HOLE FOR THE NEW SWITCH Use a 1/4" drill bit to drill a hole AMPLIFIER in the pedal housing directly between the tone and sustain holes and just above the black line (pictured). Measure the VOLUME TONE SUSTAIN location of the hole you will drill and mark that location on the underside of the housing.
  • Page 9 INSTALL JUMPERS ON THE SWITCH Cut two 4" white jumpers, strip roughly 1/4" of ATTACH BLACK WIRES TO SWITCH insulation from the end of the wires, and tin the Cut two 4" black jumpers, strip roughly 1/4" of freshly exposed wire. Wrap the wires through the insulation from the end of the wires, and tin the eyelet of one of the outside solder lugs on the freshly exposed wire.
  • Page 10 TIPS ON HEAT SHRINKING Heat shrink is used to insulate an electrical connection, like a solder joint, to prevent the connection from shorting. Slide the heat shrink all the way up to the switch, completely covering the solder joint and solder lug. Wave the flame from a lighter or the tip of a soldering iron near the...
  • Page 11 FIND CAPACITOR C8 The location of this capacitor varies by model. To find out which model you have, locate the version code. The code (similar to “EC3003 REV B”) is printed in large white letters along the bottom of the board. The last letter in that code (A, B, C, D, or E) is the version you have.
  • Page 12 ATTACH BLACK WIRE TO C8 Solder the free end of the same black wire to the lifted leg of C8.
  • Page 13 FIND RESISTOR R5 If your Big Muff is version A or B, it will be located between the tone and sustain pots. On version C, D, HEAT SHRINK SOLDER JOINT or E, it will be located just below capacitor C8. For Slide the heat shrink over the new solder joint all versions, locate the leg closest to the sustain pot and use a heat source to shrink the insulation to...
  • Page 14 ATTACH BLACK WIRE TO R5 Slide another 1" length of 1/8" diameter heat shrink HEAT SHRINK SOLDER JOINT over the second black wire that you just soldered to the new switch. Solder the free end of the same Slide the heat shrink over the new solder joint and use black wire to the lifted leg of R5.
  • Page 15 Chassis side view REASSEMBLING AND TESTING Install the new switch into its hole first, and then reinstall the rest of the components back in to the pedal housing. Re-attach the back panel with the four mounting screws. Plug in your guitar and an amp, and take your Big Muff for a test drive.

  • Page 16: Technical Support

    StewMac is not responsible for any damage caused by attempting these modifications. 21 N. Shafer St., Athens, OH 45701 800-848-2273 stewmac.com ©2019 StewMac. All rights reserved. • #2215 Updated December 2019...