HYDRA Stereo Reverb & Tremolo
$249.00
The new HYDRA is a high fidelity and true stereo Reverb and Tremolo. Designed to be the perfect end to ANY pedalboard, regardless of genre. Save up to 3 presets and dive deep into the HYDRA’s potential using our Alt Control feature. The Hydra features on-board or remote tap-tempo, you can swap the order of the Tremolo and Reverb, expression pedal control, Infinite Hold Reverb trails and so much more!
5 in stock
The HYDRA combines high-fidelity Reverb and Tremolo to add space and dimension to your guitar, bass, or keyboard signal. After the team at Keeley completed the ECCOS, we wanted to craft the perfect companion pedal, the tone of which had to make it impossible to turn off.

Save up to three presets with ease using our intuitive save feature. Engage Reverb Trails on the fly, no more internal dip switches. The Hydra can be used with pro remote switching systems and offers both TRS Expression Pedal and External Tap-Tempo inputs.
The HYDRA is a complete end-of-pedalboard solution that fits perfectly in any musician’s rig, regardless of genre. Experience next-level processing power in this pedalboard-friendly enclosure. The sky, or more appropriately, the ocean floor, is the limit with the new Keeley Electronics HYDRA!
View, download, and print the HYDRA manual here:
Click here to view and download
HYDRA Features:
- Stereo high-fidelity Reverb and Tremolo effect pedal
- Dreamy and accurate sounding Spring, Plate, and Room Reverbs
- Vintage-voiced Harmonic, Vibrato, and Sine Tremolo
- 3 Preset locations
- On board or Remote Tap-Tempo
- Smart Alt Controls for Shimmer, Spring Age, Room/Hall Size
- Infinite Hold for Reverb trails
- Expression pedal can be assigned to any knob
- Effect Order, Reverb or Tremolo first, switchable on the fly
- True-Bypass or Trails switchable on the fly
- 9 Volt DC, 146mA ultra low-current design
- Made in Edmond, USA

5 in stock
4 reviews for HYDRA Stereo Reverb & Tremolo
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Dan Voetmann –
This is a great sounding reverb with a lot of options…and I love the ability to save multiple settings so I can switch between up tempo rockers and ballads and even ambient sounds with nothing more than a toe tap. I have a pedal board I gig with and also a couple of pedal boards I leave set up and plugged in at places where I play regularly. I decided to make some updates and I tried Keeley pedals for the first time. Wow! Keeley pedals are my new favorites. Great sounding pedals, powerful but simple to use live where I can’t be bending over all the time tweaking parameters between songs. I’ve purchased multiple copies of the Blues Disorder, Mantis, Phat, Noble Screamer, Hydra, 30ms, Seafoam Chorus,… to install on all my different pedal boards. They are replacing many of my long term favorites. Not a complaint but if wishes came true I’d love for more of the pedals to have A/B/C settings (like the Hydra does) so I could switch between the settings I use live with just the push of a button. Keep up the good work and I can’t wait to see what you come up with next! Thanks!
Andy Ferguson –
The Hydra is so good! The reverb and modulation in one box that size is crazy! My favorite is the vibe and how you can widen the spread with it. That in combination with shimmer on the verbs, you can create glorious ambient sounds!
gordon –
This thing is amazingly powerful. Not does it have 3 types of modulation AND 3 types of stereo reverb, but it also has 3 storable presets, expression pedal input, but it also has tap tempo, the ability to do wet/dry outputs, and lots more parameters. Sounds great too!
viewofakind –
The Stereo Reverbs are something easy to get lost in, in a good way, while I haven’t even explored all it can do, tap tempo tremolo, presets, everyone that tries it is impressed by the sound, especially my FIL who always asks “what is that?” He likes playing surfy stuff, and I ordered a Keeley custom shop version, with just a photograph I chose, they laid it on the pedal for a custom 1of1 Hydra. Friends have also said that they were able to move about 3 pedals off their board with all the features this hydra provides and its size.