The Hungry Robot Mosfet Breaker is an overdrive pedal built on the Marshall Blues Breaker circuit, with a Mosfet gain stage driving its front end. Hungry Robot describes it as "heavily modded and tweaked Bluesbreaker with the same Mosfet gain stage driving the front end," that gain stage being the one from the maker's Mosfet Screamer1. The original Marshall Bluesbreaker was an overdrive booster pedal, and the circuit has been the starting point for many overdrive designs since2.
Where it came from
Hungry Robot states the pedal's development "came about from playing around with parts of the circuit in the shop" until the maker felt the design had been improved1. The maker is explicit that the pedal is not a copy of the well-known Bluesbreaker clones: "It is not inspired by any other Bluebreaker clones (KOT/MG)"1. In other words, it shares its starting point with pedals like the KOT and MG versions but takes its own path, borrowing the Mosfet gain stage from the Mosfet Screamer rather than following either clone design1.
Controls
The pedal's controls include two toggle switches alongside its knobs1.
| Control | What it does |
|---|---|
| Gain toggle | Controls the gain on the Mosfet stage1 |
| Bass boost toggle | Provides a bass boost for running the controls wide open when there is too much treble, or for a more creamy tone1 |
Availability and the Classics line
The Mosfet Breaker was a discontinued model. In 2022, Hungry Robot marked its ten year anniversary by launching the Classics line, bringing back older discontinued pedals1.
Classics pedals are sold direct-only from Hungry Robot and are built one by one as orders come in, so they are not stocked by dealers1.
The Mosfet Screamer, whose gain stage the Mosfet Breaker borrows, is also part of the Classics reissue program1. For a current Hungry Robot overdrive with a different approach, the maker also offers The Lumen, and the wider category is covered on the Overdrive Pedals page.
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Questions
Is the Hungry Robot Mosfet Breaker a clone of a Bluesbreaker pedal?
No. Hungry Robot describes it as a heavily modded and tweaked Bluesbreaker with the same Mosfet gain stage driving the front end, and the maker states it is not inspired by any other Bluesbreaker clones such as KOT or MG. It takes the Bluesbreaker circuit as a starting point and changes it, rather than copying an existing clone design.
What does the bass boost toggle do?
One of the pedal's toggle switches provides a bass boost. Hungry Robot describes it as being for times when you want to run your controls wide open but there is too much treble, or when you want a more creamy tone. A second toggle controls the gain on the Mosfet stage.
Where can you buy the Hungry Robot Mosfet Breaker?
The Mosfet Breaker is part of the Hungry Robot Classics line, and Hungry Robot states these offerings are direct-only, meaning they are sold through the maker rather than through dealers. Each pedal is built one by one as orders come in.
What is the Mosfet Screamer?
The Mosfet Screamer is an earlier Hungry Robot overdrive whose Mosfet gain stage drives the front end of the Mosfet Breaker. Hungry Robot describes the Mosfet Breaker as following in the footsteps of the Mosfet Screamer, and both pedals appear in the maker's Classics reissue line.
Is the Mosfet Breaker still in production?
The Mosfet Breaker was a discontinued model, but in 2022 Hungry Robot marked its ten year anniversary by launching the Classics line, bringing back older discontinued pedals. The Mosfet Breaker is offered as a Classics reissue, built one by one as orders come in and sold direct-only.
Sources (2)
- Mosfet Breaker, Hungry Robot Pedals, 2022-07-31
- Bluesbreaker by Marshall, RockBoard PedalPedia, 2026
