Carl Martin Ampster

The Carl Martin Ampster is a single-tube analog amp and speaker simulator in a pedal, with a fully analog signal path that provides touch-sensitive dynamics and immediate response reacting naturally to playing style¹. Carl Martin describes the result as a full, rounded clean sound with natural depth that moves smoothly into a distinctly British-voiced overdrive shaped by the guitar and pickup¹. It carries a recommended retail price of USD 299, EUR 299, GBP 239², and GuitarPlayer's Rod Brakes noted it is "far more than just a regular 'Marshall-in-a-box' pedal"³.

For a player, the idea is simple: the Ampster replaces the preamp section of an amplifier on your pedalboard, adds a speaker simulation so the output sounds like a guitar cab rather than a raw line signal, and gives you a balanced XLR output so you can plug straight into a PA, a powered cab, or a recording interface. It sits in the same family of gear as other preamp pedals and speaker simulation pedals, but with a real tube in the signal path and no digital processing at all⁴⁵¹.

What it does to your sound

Carl Martin says the Ampster produces "a full, rounded clean sound with natural depth" that moves smoothly, as the Gain control is increased, into a distinctly British-voiced overdrive shaped by the guitar and pickup¹. The maker also describes touch-sensitive dynamics and immediate response from the fully analog single-tube signal path, reacting naturally to playing style¹.

MusicRadar described it as a single-channel pedal with "a set of familiar amp channel controls," which is the practical point: if you have ever dialed in a tube amp, the control set reads the same way⁴. GuitarPlayer framed it as more than a "Marshall-in-a-box," positioning it as a full amp-and-speaker solution rather than a simple overdrive pedal³.

Controls

The control set follows the layout of a single-channel amplifier head¹⁴.

There are two footswitches. MusicRadar reported that these offer LED color-coded speaker emulation switching, red for the 2x12 and green for the 4x12, plus output muting⁴.

Cabinet simulations

The Ampster carries two switchable cabinet simulations: a 2x12 open-back and a 4x12 closed-back, with an LED indicating which is active¹⁴. You change between them either with the onboard footswitch or remotely (see below). Because the simulation is analog and built in, the XLR output can go straight to a desk without a separate cab sim or IR loader in the chain.

Connections and the effects loop

The rear panel carries the connections that make the Ampster work like a small amp head rather than a simple stompbox².

• Input: guitar in, as on any pedal²
• Send / Return: an effects loop for post-preamp effects, so delay and reverb can sit after the drive stage¹
• Balanced DI: XLR output to a mixer or interface¹
• Link: passes the signal from the input out to another amp or device²⁴
• Remote: an input for external foot-switching of the cabinet type¹⁴

The effects loop is the feature MusicRadar singled out, describing it as "effects send and return allowing you to route external pedals in the same way as an amp"⁴. In practice that means your delay and reverb pedals avoid being pushed into distortion by the preamp stage, the same reason amp heads have loops.

The balanced XLR direct output is what lets the Ampster connect straight to a PA or powered cab⁴, and the link output sends your guitar's dry signal to another amp or device if you want to run a real amp alongside the direct rig⁴. Carl Martin's own support material adds that when paired with a speaker simulator, IR loader, or recording interface with cab simulation, the Ampster also works well as a direct recording preamp⁵.

Remote cabinet switching

The remote input allows external foot-switching of the cabinet type⁴. Carl Martin lists it as compatible with external controllers like the Octa-Switch The Strip¹, so a player with a larger switching system can change between the 2x12 and 4x12 simulations from a central controller rather than tapping the pedal itself.

Power

Power comes from a regulated 9V DC input, center negative, capable of delivering the current needed for the tube and analog circuitry¹. Because the tube draws more current than a typical analog pedal, the maker specifies a regulated supply rather than a basic battery-style source.

Where it came from

The Ampster carries a recommended retail price of USD 299, EUR 299, GBP 239², and Carl Martin's own product page lists it at 299,00 EUR¹. Gearnews covered the release, noting the tube amplifier with built-in DI box and speaker emulation², and MusicRadar also covered it².

Players

Carl Martin's artist pages list Pete Thorn and Johnny Marr among the Ampster's users⁶.

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Questions