Monte Allums Guotar Pedal Mods

DISCLAIMER - Absolutely no refunds. All sales are final. We cannot be held responsible if you ruin your pedal. I got ripped off by a buyer of my TR-2 mod. Said he wasn't happy with the mod so I offered to buy the TR-2 from him. I gave him $110 in good faith. When I received the pedal it was non-functioning. He had drilled the hole for the pot in the wrong place piercing the ribbon going to the depth pot and completely pulled 4 traces from the PCB. And he wanted to know why the mod sounded bad. Because of this I will no longer issue refunds of any type on mods. If you do not have the skills required to perform the mod then please let us do the mod for you. Monte Allums

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DL4, DM4, FM4 & MM4 Line 6 Stompbox Modeler Mods

— Volume Drop Fix Mod
— Super Bright LED Replacement

— Switch Replacement
— Voltage Diode Replacement
— Voltage Capacitor Replacement
— Easy to Follow PDF Instructions Sent after Purchase

This mod will work with all of the Line 6 Stompbox Modelers. All the Stompbox modelers use the exact same PCB.

The DL4 is a great delay pedal. I’ve used them in the studio and live for several years. But as is the case with many mass produced pedals, Line 6 cut a few corners to bring the price point down. The switches are usually the first to go. The DL4 is also very susceptible to voltage changes. As a result there are a few areas in the circuit that over time usually go bad and need to be replaced. If your DL4 suddenly fails to start up, first check the power supply with a Multi-Meter. If the power supply is good then there’s something inside the DL4 that is the problem. Now granted I cannot cover every possible cause of your issue here, but there are some common areas to look at that are simple to fix with the right tools and a little time. With this mod I address the most common causes of problems with the Line 6 Stompbox Modelers.

Some people want to know why Line 6 hasn’t addressed these issues. Well, why should they? If a DL4 goes south, Line 6 knows they are going to make money on repairs and or sell more product. Simple economics. Don’t forget Music Man Amps. They were made so well there were no residual monies to be made on repairs. That helped contribute to their failure as a company.

With this Kit you will receive four 3mm Super Bright Clear LEDs, 4 Switches, Zener Diode, 1000uF Capacitor Solder and Desoldering Braid along with detailed easy-to-follow High Rez PDF Mod Instructions sent to you as an e-mail attachment.

LED Color


DL4, DM4, FM4 & MM4 Line 6 Audio Grade Capacitor and Burr Brown Opamp Mod

The DL4 is a great delay pedal. I’ve used them in the studio and live for almost 20 years. But as is the case with many mass produced pedals, Line 6 cut a few corners to bring the price point down. The Electrolytic Capacitors Line 6 uses can be upgraded to Audio Grade Capacitors and there are two TL072 opamps in the input and output circuits that can be upgraded.  Together replacing them improves the overall tone of the pedal. 

Electrolytic capacitors, with age, are notorious for leaking, losing their tolerance and going bad. The result can be pedal failure, noise and hum, and generally poor performance of the effect. Just like in tube amps, Electrolytic Capacitors in pedals also go bad with age and use. By replacing them the performance of the pedal is enhanced by ensuring clean power to the circuit. Where possible I replaced electrolytics with high quality Metal Film Capacitors. The Audio Grade Capacitors will take the Harshness out of the circuit.

There are different quality levels of Electrolytic Capacitors.  Here I have chosen Nichicon Audio Grade Electrolytic Capacitors.  These capacitors are some of the best audio grade electrolytics available and will take your pedal to a whole new level in audio quality.  You’ll find they will give you a tighter low end and smoother mids and highs.  For the opamps I chose the Burr Brown OPA2134UA.  These opamps will add clarity and fullness to the effect along with lower noise. 

Together these changes will push your Line 6 pedal into new tonal territory and breath new life into the effect.  The capacitors are through-hole and are easily replaced.  The two opamps are surface mount (SMD) and are actually not that hard to replace once you get the technique down.  I recommend watching several of the surface mount soldering videos on Youtube.  You’ll find as I did that with the right tools and technique replacing surface mount components can be done with relative ease. 

Even though some of the Electrolytics are not in the signal path I feel they should be replaced.  Especially on the older Line 6 pedals.  Some of these pedals are 20 years old.  Electrolytics, over time, go bad, leak and lose tolerances, which affect the quality of the effect.

IMPORTANTI am only aware of 2 different Line 6 pcb versions. I am still doing research so there may be more. If you do have a different version than listed here please contact me. Here are the two versions I offer a capacitor and opamp mod for. Please open your pedal up and confirm which version you have and order the appropriate version.

Vintage Version

Newer Version

SoundFile.mp3 — HSS Strat into a OD-308 then into a modded Line 6 DL4 and then straight into a Mac Pro VIA an MBox Pro 3 using Presonus Studio One.

Opto_Line6-DL4.mp3 Opto_Line6-DL4_ODR1_2.mp3 Opto_Line6-DL4_ODR1_5.mp3 Opto_ODR1_Reverse.mp3
Opto_Line6-DL4_2.mp3 Opto_Line6-DL4_ODR1_3.mp3 Opto_Line6-DL4_ODR1_6.mp3 Opto_ODR1_2.mp3
Opto_Line6-DL4_3.mp3 Opto_Line6-DL4_ODR1_4.mp3 Opto_Line6-DL4_ODR1.mp3 Opto_ODR1.mp3

With this Kit you will receive Solder and Desoldering Braid along with detailed easy-to-follow High Rez PDF Mod Instructions sent to you as an e-mail attachment after purchase.



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