 JAM Pedals has officially announced the release of the RetroVibe Mk4, the latest evolution of its highly acclaimed Uni-Vibe interpretation. Combining the lush, syrupy tones of late-1960s psychedelia with modern performance features, the Mk4 is designed to be the definitive modulation powerhouse for the contemporary pedalboard.
Priced at ÂŁ399.00, the RetroVibe Mk4 maintains a 100% analog signal path while introducing game-changing digital control features like tap tempo and speed ramping—tools previously unheard of in traditional “Vibe” circuits.
Vintage Soul, Modern Brain: What’s New in the Mk4?
The RetroVibe has long been a favorite for those seeking the “vocal” shimmer associated with Jimi Hendrix and David Gilmour. However, the Mk4 takes a massive leap forward in functionality.
1. Expanded Modulation Range
Building on the V3’s foundation, the new Mk4 widens the Depth and Speed ranges. Whether you require a subtle, shimmering movement for clean passages or a full-on “seasick” psychedelic wobble, the RetroVibe Mk4 delivers more headroom and versatility than ever before.
2. Tap Tempo & Ramping Functions
For the first time, players can sync their modulation to the beat of a song via a dedicated TAP footswitch. Even more impressive is the Ramping Function. By holding down the tap switch, players can trigger a smooth transition between two different speeds. This allows for Leslie-style rotary swells and dramatic “slow-downs” that respond dynamically to your performance.
3. Expression and External Integration
The pedal features dedicated TS and TRS inputs, allowing users to connect a standard 10k expression pedal to manually sweep the speed. It also supports external tap tempo switches, making it easy to tuck the main unit into the back of a rack or pedalboard while maintaining full control at your feet.
Key Features at a Glance
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All-Analog Circuitry: Delivers authentic, three-dimensional warmth.
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Chorus & Vibrato Modes: Toggle between classic phaser swirl and pitch-shifting wobble.
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True Bypass: Ensures your dry signal remains pristine when the effect is off.
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Internal Level Trimmer: Fine-tune the output volume to match your rig perfectly.
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Compact Footprint: High-end boutique tones without sacrificing pedalboard real estate.
RetroVibe Mk4 Specifications
| Feature | Details |
| Circuit Type | All-Analog Uni-Vibe |
| Switching | True Bypass |
| Controls | Depth, Speed, C/V Toggle, Internal Level |
| Connectivity | Input, Output, Expression (TRS), External Tap (TS) |
| Power | 9V DC (Negative Tip) |
| Price | ÂŁ399.00 |
FAQ: Everything You Need to Know
Q: Does the RetroVibe Mk4 use real photocells?
A: Yes! To achieve that authentic “throb” and asymmetrical sweep, JAM Pedals utilizes high-quality photocells and a bulb, staying true to the original 1960s design while improving reliability.
Q: Can I use any expression pedal with the RetroVibe?
A: The RetroVibe Mk4 is optimized for a standard passive 10k expression pedal. Using other impedances may result in an uneven speed sweep.
Q: What is the difference between Chorus and Vibrato modes?
A: Chorus mode mixes the dry signal with the modulated signal to create the iconic Uni-Vibe “swirl.” Vibrato mode removes the dry signal entirely, resulting in a pure pitch-shifting effect.
Q: How does the ramping function work?
A: You can define a “target” speed on the pedal. By holding the TAP footswitch, the rate will gradually accelerate or decelerate to that speed. The “travel time” (how long it takes to get there) is also user-adjustable.
Guitar Bomb Verdict
The JAM Pedals RetroVibe Mk4 is a rare breed of guitar effect—one that honors the heritage of analog tone without being limited by vintage technology. By integrating tap tempo and ramping into a genuine photocell-based circuit, JAM Pedals has created a tool as useful for the modern session player as for the vintage purist.
At ÂŁ399.00, it is a premium investment for those who refuse to compromise on their “Vibe” tone.
Price & Availability
Available at Andertons, priced at ÂŁ399
Available at Thomann, priced at €449
More Information
#Jam Pedals #RetroVibe Mk4
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