The 29 Pedals OAMP is an analog output driver pedal made by 29 Pedals in California. The maker describes it as an output driver that replaces conventional buffers, line drivers and preamps: it makes up to 29dB of gain, provides final signal conditioning and sweetening, and will drive lots of cable or capacitance, down to 600 ohms1. In practice that makes it a last-stop pedal, placed at the end of a chain to push a signal cleanly toward an amp, a long pedalboard run, or an audio interface when playing direct. It sits in the same family as boost pedals and preamp pedals, and RockBoard's PedalPedia tags it as preamp, booster and overdrive2.
What it does to your signal
The OAMP is built around two gain stages. The Level control sits between them, and Paolo De Gregorio of Delicious Audio noted that it "doesn't affect the overall input and output impedances," so adjusting level does not change how the pedal interacts with the gear before and after it4. The Presence control, in his words, "dials in some classic amp-style mid-scoop to tailor the midrange drive, or simulate an amp when going direct"4, which is the feature that makes the direct-to-interface use case workable without a speaker simulator.
"OAMP makes up to 29dB of gain, provides final signal conditioning and sweetening, and will drive lots of cable or capacitive loads."
Controls
| Control | What it does |
|---|---|
| Two toggle switches | Each stage has low and hi gain settings plus a fixed tone filter, to manage the 29dB of gain1 |
| Level | Sits between the two gain stages; does not affect input and output impedances4 |
| Presence | Amp-style mid-scoop for tailoring midrange drive or simulating an amp going direct4 |
Power and practical notes
Power is the OAMP's most forgiving specification: it accepts 7.5 to 35 volts of AC or DC in either polarity with no change in tone, whatever power supply feeds it1. The one thing to plan around is current: at 100mA2, it draws more than many standard pedal power supply outputs deliver per outlet, so it needs an outlet rated for that draw rather than a low-current daisy-chain connection.
RockBoard's PedalPedia states that with nothing plugged into the insert, the OAMP is true bypass when switched off2. The insert jack is part of the pedal's routing options, so its bypass behavior depends on what is connected there.
Versions and availability
The maker's product page lists two hardware revisions, OAMP Rev E and OAMP Rev C, and as of 26 October 2026 both variants were shown as sold out or unavailable1. Separately, 29 Pedals' own support page announced "EUNA and OAMP back in stock for now!!" as of 26 October 20263, so availability has been moving. RockBoard's entry notes that if you are familiar with the EUNA, the OAMP is a similar concept with a few key differences2. The maker's page listed the pedal at £227.58 GBP as of 26 October 20261.
Videos
29 Pedals
Mark Johnston
Demos In The Dark
News
Questions
Is the OAMP analog?
Yes. RockBoard's PedalPedia entry for the OAMP lists its circuit type as analog. It is a compact pedal format unit that 29 Pedals describes as an output driver replacing conventional buffers, line drivers and preamps, so all of its gain, filtering and signal conditioning happens in the analog domain.
Does the OAMP work with either power polarity?
Yes. According to 29 Pedals, the OAMP accepts 7.5 to 35 volts of AC or DC in either polarity with no change in tone, whatever power supply you use. That flexibility is unusual among pedals and means polarity or supply type is not a concern, though the pedal draws 100mA.
What is the difference between the OAMP Rev C and Rev E?
The maker's product page lists two hardware revisions, Rev C and Rev E, and as of 26 October 2026 both variants were shown as sold out or unavailable. The page does not detail the differences between the revisions, so a player comparing them has only the revision names to go on.
Is the OAMP true bypass?
Yes, with a condition. RockBoard's PedalPedia entry states that with nothing plugged into the insert, the OAMP is true bypass when switched off. The insert jack is part of how the pedal routes signal, so bypass behavior depends on whether anything is connected there.
Sources (4)
- 29 Pedals OAMP, 29 Pedals
- OAMP by 29 Pedals, RockBoard PedalPedia, 2026
- OAMP Quickstart, 29 Pedals (Believable Audio)
- 29 Pedals OAMP Output Amp / Boost, Delicious Audio, 2022-09-08
