Marshall JCM 800 Modified Guitar Amp Head 100 Watt
The Marshall JCM800 Modded Head replicates the classic tones of the iconic amp with added versatility. Featuring gain boost for tonal control & mid-boost added clarity to cut through a mix
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The amp that shaped rock history just got a serious upgrade. The Marshall JCM 800 Modified takes the legendary tone that powered AC/DC, The Ramones, and the Red Hot Chili Peppers and adds the kind of tonal flexibility today's players crave.
Inspired by the global community of guitarists who've spent decades modding their Marshalls in search of the perfect sound, this version keeps the iconic JCM800 voice at its heart while giving you the modern controls to push it further. Smooth, warm breakup or high-gain drive — it's all here, ready to cut through any mix and own any stage.
The Classic JCM800 Tone You Know and Love
The original JCM800 earned its place in rock royalty for good reason. Introduced in the ‘80s, its punchy, high-gain character became the backbone for punk rockers and metal bands alike, dominating stages for everyone from Slayer to Guns N' Roses. The JCM 800 Modified faithfully captures that signature sound.
Iconic punch and gain: Delivers the unmistakable high-gain character that made the JCM800 a legend.
Single-channel simplicity: Honors the no-frills, no-reverb design that built its reputation.
Built for any genre: Moves from smooth, warm breakup to aggressive high-gain roars with ease.
Modern Features for Today's Guitarist
This is where the Modified earns its name. Three new switches give you far more control over your sound, letting you shape that legendary tone to fit whatever you're playing. It's the same DNA, with a lot more room to experiment.
Gain boost switch: Adds extra gain and flexibility for seamless transitions between clean breakup and full-on saturation.
Mid-boost switch: Enhances mid-range frequencies for added depth and clarity, so every note stands out in the mix.
Tight switch: Trims low frequencies to sharpen your tone, keeping each note clear and defined.
Crafted in England, Built to Last
Like the original, the JCM 800 Modified is built by hand in the Bletchley, England factory. It's a blend of classic engineering and modern thinking, made by people who care as much about tone and durability as you do.
Handcrafted quality: Skillfully assembled in Marshall's historic Bletchley factory.
Classic meets modern: Combines traditional Marshall construction with new tonal capabilities.
Made to perform: Built to handle the demands of the road and deliver night after night.
Ready to Rock?
The Marshall JCM 800 Modified is more than a reissue — it's a tribute to the players who never stopped tinkering with their tone. By pairing the iconic JCM800 sound with a gain boost, mid-boost, and tight switch, it gives you the freedom to explore new sonic territory without losing the classic character that made this amp famous. If you want a piece of rock history with the versatility to match your sound, this is the amp for you.
Marshall JCM 800 Modified Guitar Amp Head Features:
Unparalleled tonal flexibility
Smooth, warm breakup to high-gain roars
Enhanced tonal versatility and control
Faithfully replicates the classic JCM800 tone
Gain boost switch provides extra gain and tonal flexibility
Dimensions (W x H x D): 746 x 304 x 214 mm / 29.5“ x 12" x 8.4"
Frequently Asked Questions
The Modified keeps the original's iconic tone but adds three new controls: a gain boost, a mid-boost, and a tight switch. These give you far more tonal flexibility while preserving the classic JCM800 sound at its core.
It's incredibly versatile, handling everything from punk and classic rock to heavy metal and modern high-gain styles. The added switches let you dial in smooth breakup or aggressive saturation for just about any genre.
Each JCM 800 Modified is handcrafted in Marshall's factory in Bletchley, England. It's the same home of craftsmanship behind the original JCM800.
The gain boost adds extra gain for higher saturation, the mid-boost lifts mid-range frequencies for depth and clarity, and the tight switch cuts low frequencies to sharpen your tone. Together, they give you precise control over your sound.
Yes, it stays true to the original's single-channel, no-reverb design. The added switches expand its tonal range without complicating that classic, straightforward layout.