The Behringer UT300 Ultra Tremolo is a compact tremolo stompbox aimed at players who want the classic tremolo effect made famous by vintage '50s amps. Tremolo works by pulsing the volume of your instrument signal at a rate you set, producing that rhythmic swell-and-fade heard on countless recordings from the era. Behringer describes the UT300 as the pedal to reach for "when you've got to have the classic tremolo made famous by vintage '50s amps."1
It is a simple three-knob pedal, and Behringer's own description of the circuit's lineage explains the approach: "Vintage amps produced this intriguing effect by pulsing the volume of the instrument signal at a user-adjustable rate."1
The controls: Rate, Wave and Depth
The UT300 keeps things to three dedicated controls for sound shaping1:
| Control | What it sets |
|---|---|
| Rate | The speed of the volume pulse |
| Wave | The shape of the pulse |
| Depth | How far the volume dips |
That three-knob layout will look familiar to anyone who has used a Boss TR-2-style tremolo. Josh of JHS Pedals, writing about Behringer's pedals, noted the resemblance: "The Ultra Tremolo UT300 is a three knob tremolo. The original BOSS TR2 is a three knob tremolo, very similar labelings."34 MusicRadar's buying guide likewise lists the TR-2's controls as "Rate, depth, wave," the same trio in a different order.5
Power and switching
The UT300 runs on 9V DC, center negative2, and Behringer says "you can power this groovy little stomp box with either our PSU-SB DC power supply (not included) or a 9 V battery."1 The PSU-SB is sold separately, so budget for one if you plan to keep the pedal on a board.
The power supply is not included with the pedal. The UT300 uses 9V DC center negative, the standard polarity for most pedalboard supplies.12
For switching, Behringer states that "a top-quality On/Off switch maintains excellent signal integrity in bypass mode,"1 and the pedal carries a bright LED to show when the effect is engaged.1
Videos
SLÄRP
The Guitar Manifesto
Chuck's Guitar Geekery
Questions
Does the Behringer UT300 run on a 9V battery?
Yes. Behringer says you can power the UT300 with either its PSU-SB DC power supply, which is not included with the pedal, or a 9V battery. That makes it easy to try on a board or take to a jam without carrying a power supply, though a supply is the usual choice for regular use.
What power supply does the Behringer UT300 use?
Behringer specifies its own PSU-SB DC power supply, sold separately. The pedal runs at 9V DC, center negative, which is the standard polarity used by most pedalboard power supplies, so a typical multi-output brick will power it alongside your other pedals.
Is the Behringer UT300 true bypass?
Behringer does not use the phrase true bypass. The maker states that a top-quality On/Off switch maintains excellent signal integrity in bypass mode, meaning the pedal is designed to pass your signal cleanly when switched off.
Does the Behringer UT300 have an LED?
Yes. The UT300 has a bright LED that shows the effect state, so you can see at a glance whether the tremolo is engaged, even on a dark stage.
Sources (5)
- UT300 | Behringer, Behringer
- UT300 Ultra Tremolo by Behringer, RockBoard PedalPedia, 2026
- WHAT'S THE DEAL WITH BEHRINGER?, JHS Pedals
- BOSS Effects Pedals for Keyboardists, BOSS (articles.boss.info), 2025-07-17
- Best tremolo pedals for guitar: Shake up your tone, MusicRadar, 2019-10-23
