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

Boss HM-2 Heavy Metal Cap Upgrade Mod Kit

Electrolytic caps in tube amps, over a period of time, start to leak, loose their tolerance and go bad. It’s just the nature of Electrolytic caps. Sometimes the leaking is actually visible. But Electrolytic caps can look okay and still be faulty. By replacing Electrolytic caps in older pedals you can actually improve the overall effect of that pedal. Honestly I was skeptical until I received an email from a client that was having issues after he modded his Boss BF-2 with one of my kits.  He said the flange effect was barely noticeable.  A couple of weeks later I received another email from the same client.  The client said he had solved the issue by replacing all the Electrolytic caps in his BF-2.  This peaked my interest so I started experimenting.

I was astonished how some of my older pedals benefited from the cap upgrade!  Noise seemed to be reduced and clarity and presence of the effect were enhanced.  I am now offering these Cap Upgrade Kits for many of the pedals I offer kits for.  In some cases some of these caps are already upgraded in the kits that I offer.  But I am offering kits that replace all the Electrolytic caps for those that have not purchased my kits.  They will benefit from upgrading the Electrolytic caps that I do not replace in my kits.  You’ll find that some of these same caps are already replaced in the kits I offer.  It’s a win win all around for those that want the maximum benefit when upgrading their pedals.  But I didn’t stop there, when possible I have upgraded these Electrolytics with Metal Film and Tantalum.  Not only do these caps have tighter tolerances but they will also last the life of the pedal.


Boss HM-2 Heavy Metal Vintage Plus Mod Kit

This pedal was made from 1983 to 1991 and if you're into Swedish Death Metal tones this is your ticket. The tone sweep garners a wide EQ pallet but the gain pot doesn't do much past about 10 o'clock. The gain is also very much like a fuzz box.

I do recommend doing the cap upgrade (sold above) on the electrolytics. They tend to go bad over time which affects the circuit in a negative way. Bad caps will leak causing hum and noise and weekening the effect. A new set of caps really makes this pedal come alive.

I convert the 12 volt circuit to 9 volts which gives the circuit more headroom and bring the voltage up to more modern standards. I have also added some upper mids to the circuit and taken the buzz out of the gain and added smoothness and harmonics. I have also upgraded critical components in the circuit to give the effect a more Hi-Fi quality.

What you end up with is a very thick and almost soupy gain structure with a ton of crunch that is suitable for a wide vaviety of tones. Welcome to the your New Boss HM-2!

NOTE: I include in the instructions how to convert the HM-2 from ACA 12 Volts to PSA 9 Volts. It is an option and you can certainly choose to keep the pedal 12 volts ACA if you like.

Boss HM-2 Sound Sample.mp3

Boss HM-2 Sound Sample.mp3



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