The AMT O-BASS is a bass preamp pedal from AMT Electronics, built around a model of the Orange AD200 mark3 bass amp. It is part of the AMT Bricks series of devices, a line of pedal-format preamps, and it is listed as AVAILABLE NOW by the maker1. For a bass player, it works as an amp-style front end: an analog preamp with three gain modes feeds a Power Amp section with 9 types, and an IR cabsim handles the speaker and cabinet part of the chain, so the pedal can go straight to a mixer, an audio interface or a power amp.
What it does
The pedal's signal path has three main stages, each with its own controls:
- Analog Preamp with Clean, Low gain and High gain modes3
- Power Amp with 9 types5
- IR cabsim with 1 IR for both L/R channels per preset3
- Noise Gate, set globally rather than per preset2
The preamp is analog, while the Power Amp and IR cabsim sections are handled digitally. The IR cabsim loads one impulse response for both left and right channels in each preset, which shapes the recorded or direct sound the way a bass cabinet would3.
Where it sits in the AMT Bricks range
AMT's own detailed review, written by Ivan Demichev, places the O-Bass in the company's bass lineup: "And the last 2 preamps, are the X-Bass product line"4. The same review maps the circuits to the amps they emulate: "Orange AD200 mark3 bass amp, which is the AMT Bricks O-Bass"4. The other preamp in that X-Bass line is the AMT Bricks A-Bass, so a player choosing between the two is choosing between two different amp voicings in the same pedal format.
The O-Bass is a tube-hybrid design: AMT states the preamplifier can be equipped with a tube of one of the following types: AMT-12AX7WS, 12AX7, ECC83, or another 12AX7-compatible tube1.
Using it on a board
As a preamp with a built-in cabsim, the O-BASS covers ground a player might otherwise split across several pedals: it can replace a separate preamp pedal and a speaker simulation pedal in a direct-to-FOV or direct-to-interface rig. The global Noise Gate is worth knowing about before dialing in sounds: because it is not per preset, the gate setting carries over no matter which preamp mode or Power Amp type is selected2. Players interested in AMT's other bass gear can also look at the AMT Bass ZEALOT BZ-300 power amp or the AMT BC-1 bass crunch pedal, and the Bass Pedals page collects the wider category.
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Questions
Is the AMT O-BASS part of the AMT Bricks series?
Yes. AMT Electronics describes the O-Bass as part of the AMT Bricks series of devices. Within that series, the X-Bass product line holds two bass preamps, and the O-Bass is one of them, sitting alongside the A-Bass in the company's bass preamp range.
Does the AMT O-BASS have a noise gate?
Yes. The O-BASS includes a Noise Gate that works as a global setting, so it applies across the pedal rather than being set separately for each preset. That helps keep the signal clean when switching between the Clean, Low gain and High gain preamp modes.
How many power amp types does the AMT O-BASS offer?
The Power Amp section offers 9 types. Combined with the analog preamp's three modes (Clean, Low gain and High gain) and the IR cabsim, it gives a player a range of amp-like voicings in one pedal.
Sources (5)
- AMT O-Bass, AMT Electronics, 2026
- AMT O-BASS, AMT Electronics
- Обзор предусилителей AMT A-bass и O-bass, Media center of AMT Electronics
- AMT BRICKS preamps, AMT Electronics, 2026
- BASS OVERDRIVE / DISTORTION / FUZZ, Media center of AMT Electronics
