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Matamp GT120

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Page last updated Apr 25, 2026

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Description

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The GT120 is a reissue of the original 70s amp. Unmistakable Green Matamp organic sound at incredible sound pressure levels or classic Matamp warm clean.

The preamp is the original circuit including the four position drive switch, bass boost and presence/boost circuit incorporating the inductor.

The key to this amp is its clean tone. The preamp has origins going back to the days of Orange Matamp when Peter Green described the tone he wanted to Tony and Mat as “sweet….but not like treacle…like honey.” Coupled with four EL34s the warm sweet clean tone is a perfect match for fuzz.

The power amp has been slightly updated to feature individual bias adjustment per valve. This makes matched sets a thing of the past and enables the user to replace a single valve while still maintaining optimum performance.

The big difference in this reissue is that the amp is now hand wired on turret tracks, our hybrid PCB turret construction method that we have been using throughout this millennium. Greatly improving reliability and serviceability over previous versions, including the original amps from the 1970s. We have searched the country to find a transformer company still capable of making transformers that live up to the quality and reliability of the old units.

The GT120 can drive multiple cabs from the 4, 8 & 16 ohm speaker outputs. The amp has been updated to allow multiple cabs to be connected direct from the head without daisy chaining.

Also available in Green for no extra cost!

Product specs

Amp Type

tube

Videos

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Does It Doom?

Matamp GT120 vs Orange OR120 Doom Metal Amp Shootout

Does It Doom?

Green Matamp GT120 MV Amplifier Demo - Sleep - From Beyond

Does It Doom?

Sunn Model T vs Matamp GT1 vs Green Matamp GT120 Doom Metal Amp Shootout riffing in A Standard

Seger Guitars

Doom Metal Amps: Matamp GT120 Demo

Fuzzlord Effects

Matamp GT120 + Orange OR50 both at max volume | Insane sounds!

siets96

Green Matamp GT 120 Master Volume Full Review

Bobby Bass Universe

Matamp GT120 Fuzzlord Effects Alchemist pickups (neck) no pedals | audio clip

PedalTVchannel

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Matamp GT120.

Comparisons

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Unlike the typical JCM800 design, the Matamp GT120 is not based on a Bassman-style circuit and offers a different tonal approach.
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Owners have compared the GT120 to the Orange OR120, noting similarities in sound, but distinct differences in features such as tone stack and power amp design.
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Offers more low end than Orange amps, enhancing its capability for heavy music genres.
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Value and pricing

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Despite the owner's controversial reputation, the amps maintain high resale value due to their rarity and build quality, with offers reaching up to $3,000.
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Buying directly from Matamp UK can be cost-effective due to favorable exchange rates; customs fees are reportedly non-existent.
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User experience

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Owners note the amp is exceptionally loud, even compared to other high-powered amps, and is often described as redefining what "loud" truly means.
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It's essential to play the amp cranked to appreciate its tone, as its power amp distortion is a key part of its sound.
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Owners suggest the amp is exceptionally loud and may require a power soak for manageable volume levels.
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Use cases and applications

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The GT120's immense headroom and fuzz capability make it ideal for heavy fuzz and stoner doom genres, creating a dense "wall of smoke" sound.
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Achieving tones akin to Tool or Helmet may require an overdrive or boost pedal for a more immediate attack and high-gain tone.
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Known for its doom tones, but can also produce thick, clean sounds ideal for a variety of styles, including Black Flag-style riffs.
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Features and functionality

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The amp features a shelving EQ design distinct from typical tone stacks, allowing for a unique tonal palette that is not a direct clone of Matamp or Orange circuits.
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The Baxandall tone stack design offers an adjustable mid slope, allowing for diverse tonal characteristics from chimey to dark.
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FAC control settings greatly influence the sound; turning it down emphasizes low drone, while 2-3 o'clock settings help cut through a mix.
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The GT120 features a unique active shelving EQ, allowing for more fidelity in lows and highs, enhancing its versatility in tone shaping.
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The amp is versatile, allowing for both high-gain destruction and cleaner tones depending on settings.
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Build quality

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The GT120 is known for its robust construction, likened to being "as solid as a brick sh!t house," emphasizing its durable build quality.
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Mods and upgrades

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Using a high-gain rack preamp, like the ART DST 80/80, can be combined with the GT120MV’s preamp for modern gain textures.
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Custom hieroglyphic symbols are available upon request, offering a unique aesthetic option.
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