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Discontinued – We no longer modify these amplifiers.Various factory issues have proven time consuming to resolve/repair. To date we have absorbed a great deal of time/cost associated with repair(s) of these models, however we can no longer continue to do so & nor do we wish to charge customers for costly repairs. Please note; our Mods do not cause/contribute to noted factory issues. All warranties for Voodoo Mods still apply.

Sorry no exceptions - Any and all units shipped in after 01-09-12 will be returned at sender's expense.

We recommend the Marshall JVM205 / JVM210. By comparison the JVM205/210 is more reliable, parts are readily available and we have several professional musicians touring/using these.

 

Marshall JCM900 4500 "Metal" Mods
Standard Mod™  $295.00  
Deluxe Mod™  $574.00 
Platinum Modified™  $898.00  FREE SHIPPING!
Platinum Modified™ 
$918.00  International Customers!

 

Mod Process & FAQ's
Packing & Shipping Info

 

 

 

 

 

"Highly saturated, liquid-like high gain, effortless to play with blistering harmonics all coupled with a deep/chunky low-end! A modern metal players dream come true!!" 

 

  Standard Mod™  $295.00
Circuitry Modifications

Description / Specs:

  • All Modifications are exclusive to Voodoo Amps®  
  • Highest gain Mod available for the JCM900 4500 series
  • Designed for Modern Metal players
  • Channel A - Improved cleans but most ideal when used as a rhythm channel
  • Channel B - Greatly increased gain & highly saturated!
  • Maximum versatility with our new "Saturate" control pot & Global control (included) 
  • Saturate control allows you to dial in more saturated gain to meet your needs
  • No matter how much gain you use you can still hear all the notes within the chords
  • When you turn the gain control to 10 - it's all useable
  • Increased sustain - Smoother & more liquid like
  • Increased rich harmonic detail & complexity
  • Pinch harmonics are effortless - Zakk fans will love it!
  • Endless liquid-like sustain -Incredibly smooth & easy to play
  • Leads & rhythms are extremely fluid - Vibrato & bends feel smoother / easier
  • EQ section is much more active, responsive & musical
  • Brighter or warmer / browner tones can be dialed in via EQ adjustments
  • Mids are very focused & cut through with ease
  • Big low-end - perfect for modern metal palm mutes
  • Highs are smoother & more open
  • The tone is much more inspiring, smoother/easier to play & more fun to play on
  • Faster attack - tracks every note you play immediately
  • Over all frequency response is better balanced / more even sounding
  • Cranked tones at lower volumes
  • Will cut through & sit in the mix much better live as well as in the recording studio
  • Saturate & Global controls are installed in place of Reverb controls
  • Note: Reverb is disabled - reverb cables & pan are removed
  • Note: Channel A makes for a better clean channel verses a crunch channel 
  • All other features will function the same - Features are not removed nor disengaged 
  • Recommended Voodoo Add-On™ controls; Bottom or Push/Pull Bottom
  • We do not offer Modifications or upgrades to the fx-loop, switching circuitry or reverb   
  • All components used are high quality & are chosen for quality of tone, feel & reliability 
  • Please list "Metal Mod" in the notes section of the Mod-Form
  • Voodoo Mods™ retain your amps resale value verses decreasing it
  • Approximate turn-around time 5-7 days - rush service is available 

 

  Deluxe Mod™  $574.00
Output Transformer Upgrade to Standard Mod™

Description/Specs:

  • Includes Standard Mod™ (see above)
  • Incudes Upgraded Mercury Magnetics VA-4500-O Voodoo-Designed™ Output Transformer
  • $229.00 & $50.00 Installation fee (included)  
  • Vastly increased sustain - leads are much more liquid like & fluid
  • Effortless Pinch / artificial harmonics
  • Greatly improved articulation & definition
  • Increased / deeper bass response
  • Increased even-order harmonics (IE: sounds much more musical)
  • Massive rhythm tones - when you hit a chord it's there immediately
  • Increased headroom (cleans stay cleaner & louder at gigging/stage volumes) 
  • Approximate turn-around time 5-7 days - rush service is available 
  • Transformer FAQ's

 

  Platinum Mod™  $898.00  FREE SHIPPING!
Power Transformer Upgrade to Deluxe Mod

  • Includes Deluxe Mod™
  • Includes Upgraded Mercury Magnetics VA-4500-P Voodoo-Designed™ Power Transformer
  • $249.00 & $75.00 Installation fee (included) 
  • 120V 60Hz Operation
  • Improved power regulation 
  • Greatly reduced noise and hum
  • Improved frequency response
  • Improved feel & tone  - Smoother feel & easier to play 
  • Greatly improved bottom end - smooth / liquid like to play on 
  • A must for touring musicians, engineers and producers! 
  • Platinum Mod™ will give you the best tone, feel and performance 
  • Average turn-around time 5-7 days - rush service is available
  • Transformer FAQ's
  • Voodoo Amps® World AC Voltage Guide

 

  Platinum Mod™  $918.00  International Customers!
Power Transformer Upgrade to Deluxe Mod

  • No need for step-down transformers that can harm your amp!
  • Includes Deluxe Mod™
  • Includes Upgraded Mercury Magnetics VA-4500-PE Voodoo-Designed™ Power Transformer
  • $269.00 & $75.00 Installation fee (included)
  • Specify your voltage - 100V, 220V, 230V, 240V & More!
  • Improved power regulation
  • Greatly reduced noise and hum
  • Improved frequency response
  • Improved feel & tone  - Smoother feel & easier to play  
  • Greatly improved bottom end - smooth / liquid like to play on
  • A must for touring musicians, engineers and producers!
  • Platinum Mod™ will give you the best tone, feel and performance 
  • Average turn-around time 5-7 days - rush service is available
  • Save money! Buy from Ebay USA, have it shipped directly to us & we will ship it you!
  • Save money on shipping! We offer several shipping options, please Email us for an estimate!
  • Transformer FAQ's
  • Voodoo Amps® World AC Voltage Guide  

 

 Mod-Form  /  Mod Process & FAQ's  /  Packing & Shipping  /  Reviews  /  Contact

"Get inspired - upgrade your tone now!" 


 

 

Voodoo Amps® is the Leader in Tube Amp Mods & Upgrades

Pricing, features & specifications subject to change without notice

 "We have countless Mods that we have designed & will be adding them to the site daily!"

If you do not see your amp listed here please call (607-256-0465) or email us!  

 

  

 

Customer Feedback  "I've had this 900 forever and it was never my go to amp. It lacked gain and it never really had much bottom end to it. Shipped it to Voodoo and figured I would give their Metal-Mod a try. I still can't believe how much better the amp sounds! It has a lot of thumping bass to it now and way more gain. They removed the Reverb controls and put in the Global and Saturate knobs. The Saturate does exactly that - it saturates the gain a great deal or I can back it off. Global is like sweepable mids which is killer for recording and for live gigs" - Dave Kole, CA

Customer Feedback  "Trace, First off I want to thank you and the crew for the incredible service on my amp. I don't know how you did it, but you turned my mediocre JCM900 into a marvelous metal machine!! My jaw dropped and I couldn't stop playing once I got it. I've played many amps and this one is leaps and bounds my favorite amp ever. The TONE is perfect and everything I've ever wanted in an amp. This thing even sounds better than my cousin's Mesa Triple Rectifier!

Sound quality is amazing. There is a unbelievable amount of bass. Chugs sound so fat and thick you can cut it with a knife. The EQ section, you can actually hear a big difference when you turn the knobs. The highs can cut through the mix like butter, the mids sound even more amazing with the global knob too, and the bass is INCREDIBLE. So easy to get a metal chug out of this amp. In the unmodded JCM900, the EQ seemed to be lacking. You can turn those knobs all you want, it seemed like there was only 1 default setting whether you turned the mids/treble/bass up to 10 or 1.  The mids were too screechy, the highs were too piercing and the bass was barely there)
 
Volume is another thing that amazes me about this amp mod. Pre-mod, I had to crank it to at least 7 or 8 to be heard. Now post-mod, I only need to be up to 3-4 and it is balls to the wall loud! And the best thing about it is that even at volume 1, this sounds like it's cranked!! (in the unmodded JCM 900, low volume was not an option. The thing sounded like crap anywhere under 5. Sounded thin, lifeless, and no presence at all). Thanks!" - Ryan Aquino, IL

Customer Feedback  "The JCM900's are cheap to buy and Voodoo transformed it into a magnificant metal machine. After the Mods it hangs neck and neck with lots of other amps cost $1000 or more. I'm in love with the Saturate control! Its the coolest control I've used in a long time and all amps should have it! - Craig Smith, NY

Customer Feedback  "I sent my Marshall JCM900 to Voodoo expecting a change and wound up literally blown away at what I heard back. This amp went from sweet to just well... no words can describe!. Best investment I've ever made in music, NO LIE. This gain will kill you. Man I COULD NOT be happier with my amp,its insane sounding." Buddy Rogers - Deception of a Ghost"

Customer Feedback  "THANKS SO MUCH!! You guys are masters of tone and I cannot even believe how brutal my amp sounds. Took it to band practice and everyone was floored. No one could believe it was the same amp I had been using. We're going to track a new CD and I'm gonna use for the entire record. I will be spreading the good word and telling everyone one of my guitar playing friends about you guys!" - Carl Perry, WA

Customer Feedback  "How would I describe it? Crushing brutality taken to the 10th degree and that still doesn't come close to how cool this sounds. You were so right about how easy this plays and it is very additive. I could play this all day and never get tired of it. I've written several new riffs already and I can't say enough good things. The bass is very responsive and deep but not stiff. The mids are the classic Marshall mids but have a sweet saturated feel and the highs cut through perfectly. I took the chance and got the Platinum Mod and it's everything I hoped it would be. Still can't believe this is a  JCM900 (Lol). The gain is sweet and the amp sustains farrrr better than it ever could have before. I will be sending my 1959HW to you next, thanks!" - Brett James, CT

Customer Feedback  "When I first got this amp, it absolutely sucked. Marshalls with 5881/6l6 tubes sound like garbage imho. I almost wanted to sell it, but I heard about voodoo for many years. So I decided to give them a shot. This thing is awesome now! Absolutely amazing! I have a 5150 block head, ampeg vl, and have owned a TSL100 marshall, xxx, jsx, etc. This is by far my favorite amp. I went with the Standard Mod, which totally cleaned up the amp (much quieter) the clean channel can actually be clean, and the gain channel has so much gain and balls. I also went with the el34 mod for my amp since it came with the 5881 power tubes. Much better! Nice bottom end. I dont even know how to explain how good this thing sounds!! My amp is constantly being moved to and from practice, shows, studios, etc. This thing can seriously handle every ounce of beating I have given it. I have never had any trouble with it, the mods have held tight, and all I can say is I am 100% satisfied with the outcome of my amp.

The people at Voodoo are extremely helpful and very knowledgeable when it comes to amps. Ive called and spoke with numerous people about different heads I have wanted to have modded and they always help me as much as they can. Also, when I sent my amp in, there were a few issues with it that needed to be worked out, and they called me immediately and discussed it with me. These guys are absolutely amazing."  - Mark, Harmony Central Review

 

 

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