The Berserker Electronics Hydronaut Delay Echo is a delay pedal designed to ride the line between warm and clear, vintage and modern. It is an analog-voiced delay with no digital modeling and no presets, and it follows the company's Aquanaut Delay Echo, taking what worked on that pedal and adding a fourth knob, Tone, to shape the repeats1. For a player, it is a straightforward set-and-turn delay: up to 600ms of delay time, a Tone control that places the repeats anywhere from dark and buried to bright and crystal-clear, and a Bias LED that acts as a health indicator for the delay circuit1.
What it does to your sound
Pedal of the Day's review describes the Hydronaut as a hybrid delay, and the character of the repeats is the heart of it: "The repeats sit just a touch behind your dry signal. Never overpowering, never sterile. They bloom with a subtle warmth," the review continues, noting they stay articulate enough to cut through a live mix1. The review also found the pedal sits well alongside other effects, saying it "plays well with dirt and modulation alike," which matters if you are running it into overdrive, fuzz or chorus pedals1.
The circuit itself was not modeled or calculated into being. As the review puts it1:
"Inside, the circuit is tuned by ear. Hours of tweaking values and listening through different amps, guitars, and rigs un..."1
That ear-tuning shows up in how the controls behave, particularly the Tone knob1.
The controls and the Tone knob
The Tone knob is the headline addition on the Hydronaut. "New on the Hydronaut is the 4th knob: Tone," Pedal of the Day notes, and it lets you place the repeats exactly where you want them in the mix1. The two ends of its travel are described as distinct voicings:
| Tone knob position | Character of the repeats |
|---|---|
| Minimum ("Analog") | Darker, more buried, and slightly submerged in the mix1 |
| Maximum ("Digital") | Brighter, more present, and crystal-clear on top of the dry signal1 |
In practice that means one knob covers the range from a vintage-style dark echo that sits behind the band to a clearer, more modern repeat that stays upfront. Beyond Tone, the pedal carries a Bias LED tied into the delay chip's bias point, which acts as a simple voltage protection and health indicator, a small diagnostic feature that gives you a visual check on the circuit's condition1.
Hydronaut versus Aquanaut
The Hydronaut is the second delay in Berserker's lineup, an improved version of the Aquanaut. The review's summary of the relationship: "the new Hydronaut takes all the good stuff from the first pedal and improves upon it, with glorious results"1. The concrete difference is the Tone knob, added as the fourth control where the Aquanaut had three1. Players who found the Aquanaut's repeat voicing fixed will find the Hydronaut adds that shaping control without changing the pedal's basic character.
What reviewers said
The Hydronaut was featured on Pedal of the Day on 1 July 20261. The review's verdict on the pedal's flexibility was emphatic: "if you can't find a sweet spot on this pedal, you might want to re-examine your life," with the reviewer singling out its overall tone flexibility1. Between the 600ms maximum, the Tone knob's two voicings and the absence of menus or presets, the pedal comes across in that review as a delay for players who want to turn knobs and play, not program.
Videos
Pedal of the Day
Jack Fossett Guitar
Questions
What is the maximum delay time on the Berserker Hydronaut?
The Hydronaut goes up to 600ms of delay time. Pedal of the Day notes that this figure was chosen deliberately, saying it goes up to 600ms because that sweet spot in delay time matters. That range covers the short slapback and medium echo territory most players use, though it will not reach the long, self-oscillating delays of pedals with multi-second maximums.
Is the Hydronaut analog or digital?
Pedal of the Day describes the Hydronaut as an analog-voiced delay with no digital modeling. The pedal is designed to sit between warm and clear, vintage and modern, and the review found it plays well with dirt and modulation pedals alike. There is no digital modeling on board and no presets to store.
Does the Hydronaut have presets?
No. The Hydronaut has no presets. Pedal of the Day's review puts it plainly: no digital modeling, no presets, just honest analog-voiced delay. Players set the knobs by hand each session, which suits the pedal's straightforward design.
What does the Tone knob do on the Hydronaut?
The Tone knob shapes the character of the repeats. At its minimum, Pedal of the Day describes the repeats as darker, more buried, and slightly submerged in the mix, the classic analog character. At its maximum, described as the Digital setting, the repeats are brighter, more present, and crystal-clear on top of the dry signal.
What does the Bias LED on the Hydronaut show?
The Hydronaut has a Bias LED tied into the delay chip's bias point. Pedal of the Day describes it as acting as a simple voltage protection and health indicator, giving the player a quick visual check on the condition of the delay circuit.
What is the difference between the Hydronaut and the Aquanaut?
The Hydronaut is an improved follow-up to the Berserker Electronics Aquanaut Delay Echo. The main addition is a fourth knob, Tone, which shapes the repeats from dark and buried to bright and clear. Pedal of the Day says the Hydronaut takes all the good stuff from the first pedal and improves upon it, with glorious results.
Sources (1)
- Berserker Electronics Hydronaut Delay Echo, Pedal of the Day (www.pedal-of-the-day.com), 2026-07-01
