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The guitar overdrive pedal that replicates the legendary Vox UL730 amp

The Dr. Robert is a guitar overdrive pedal based on the Normal channel of our Vox® UL730 S/N: 3042. This amp in a box pedal was designed to be the closest replica of the amp’s soul and character. A meticulous process of tracing the original tag board circuits and measuring each component’s value has resulted in a sonic approach never reached before. 

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Dr. Robert Features

The most accurate replica of the original UL730 preamp

We’ve found some internet and old schematics but major discrepancies between the published schematic and the real thing were detected. We checked every component type and value so we are 100% sure this is the closest you can get to the rarest Vox amp.

The pedal also works with the same voltage the original amp does, the circuit takes the 9VDC and converts it to 18VDC.

Mach Schau! (extra feature)

Get more saturation with an independent volume control. Use it in solo parts to raise the volume or just to have more distortion with the same volume.
"Mach Schau!" was shouted by the businessman from one the Hamburg's venues when The Beatles resided in Hamburg when energy fell flat, and they had to put on more of a show.

High end components and true bypass switching

You will find the finest and closest components to the original amp on the Dr. Robert: Carbon comp resistors, Nichicon Fine Gold and Wima caps, Alpha pots and switches...

Dr. Robert works for guitar & bass players

The VOX UL400 series (designed for bass) almost have the same circuitry than the VOX UL730 preamp.
We tunned the FET circuit so Dr. Robert sounds flawless with bass too. No low-end drops resulting in a great preamp and distortion tool to plug directly to the desk or into an amp.

Bass and Treble internal controls

The original VOX UL730 had a 3 band eq: Middle, Bass and Treble.
Middle control is the one that helps to tailor the tone better, that is why this is one of the main controls. You can access to Bass and Treble controls inside the pedal. Check out the internal controls section to know more about this.

Artwork made by Klaus Voormann

Klaus Voorman, designer of The Beatle’s Revolver album cover sign the artwork for the Dr. Robert.

Take advantage of the Smart Fastening System

Our pedals use a custom enclosure designed to match our Smart Track® pedalboards. Using the side thumb screws you will be able to attach and lock the pedal into the pedalboard, with no risk to loose it or to get robbed easily.
It also comes with a high quality Velcro® pad so you can use it on any other pedalboard in the market.

 

Controls

Internal controls

 

The "Middle" control is one of the keys of this amp in a box, which is one of the most interesting mid-range eq ever found on an amp. From subtracting mid-frequencies creating a scooped sound, to adding them to build up the sound in gain; tailoring the “Middle” knob will allow you to control both the midrange and saturation of the Dr. Robert. As the solid-state preamp of the UL730 doesn’t create much distortion by itself, it has been coupled with a custom FET saturation engine to mimic the attributes of the tube power amp section.

The original UL730 had a 3 band eq, but since the Middle control is the one that helps to tailor the tone better we decided to put the Bass and Treble controls inside the pedal. Just to make the user interface cleaner and easier to operate.

This amp in a box pedal will also allow you to add saturation to your main sound using the “Mach Schau!” section of the guitar overdrive pedal, with an independent volume control to swap between rhythmic and solo tones.

 

Dr. Robert audio samples

RAIN

(Played with a Epi)

PAPERBACK WRITER

(Played with EPI)

(Played with Gretsch 6120)

(Played with Gretsch 6120 PepBox)

SHE SAID SHE SAID

(Played with a Epi)

(Played with a SG)

DR.ROBERT

(Played with a Epi Omni)

 

TAXMAN

(Played with a Strato Omni)

TAXMAN (SOLO)

(Played with a Strato Solo)

SGT. PEPPER'S

(Played with a Casino Rhythm GT)

SGT. PEPPER'S

(Played with a Lead Epiphone Casino Solo - Cm 01)

(Played with a Lead Strato Solo - Cm 01)

 

Dr. Robert tech specs

Dimensions:13,6 x 8,7 x 5,5cm (5,4” x 3,4” x 2,2”) with knobs
Bypass: True bypass
Power requirements9V DC Center Negative 100mAminimum or a 9V battery
 Current draw: ≈40 mA
 Included: 1 x Anti-sliding rubber pad & 1 x Velcro® pad


Download the complete user manual.

ENGLISH   FRANÇAIS   SPANISH  DEUTSCH  日本語


The story behind the Dr. Robert effect pedal

Pursuit of an Iconic Sound,
the Inception of a Long Journey.

Chapter 1

This video marks the beginning of our short serie about Dr.Robert, Aclam’s latest overdrive pedal. In this chapter Marcel and Marc, the two people at the origin of project, take us back to the 60s to explain us how Revolver and the Vox UL series inspired them to create Dr.Robert.

Vox UL series,
Myth or Big Deal? 

Chapter 2

Our serie about Dr.Robert overdrive pedal continues with our second episode, “Myth or Big Deal”. Marcel and Marc, original creators of our latest overdrive pedal, discuss about the importance of Vox UL series for the Beatles and the music industry in general.

Amp Hunting: Speculation,
Scam, and Tomatoes

Chapter 3

In the 3rd episode of our serie about Dr.Robert overdrive pedal, Marc and Marcel, creators of Dr.Robert, tell us about their quest to find the UL amplifier. A long path, full of pitfalls, scams, and a lot of patience. Was it a happy ending?

 

Restoration and
Tonal Harvesting 

Chapter 4

The creators of Aclam’s Dr.Robert overdrive pedal are back in action in the 4th episode of our serie. Now that they have finally acquired the amplifier they were looking for, Marc and Marcel can start the restoration process.

Contextualizing the Tone

Chapter 5

Discover in the 5th episode of our serie about Dr.Robert overdrive pedal how Aclam came up with the name Dr.Robert, and the branding process featuring Klaus Voormann, the iconic designer from the Revolver album.

Fitting Pieces Together

Chapter 6

After a year working on the project, Dr.Robert overdrive pedal creators tell us about the challenges and experiences met during the creation process. A great journey that started in Barcelona, but that’s taken inspiration from a lot of places. Discover it now in the 6th and last episode of our serie.

 

Dr. Robert Live Demo!

(Bonus Chapter)

Dr.Robert is Aclam’s latest overdrive pedal. In the last chapter of our serie, we’re reviewing together with its creators the features of the product.

Mach Schau!

Dr.Robert Pedal

Discover Aclam’s newest guitar pedal: Dr.Robert. A perfect replica of the legendary Vox UL730 amp, famously used by The Beatles!

 

Demos and reviews of the Dr. Robert pedal

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What it's said about the Dr. Robert effect pedal


Not just for Beatles fans, but definitely for Beatles fans.

The llustration by “Revolver” cover artist Klaus Voorman really brings that spirit and feel of those classic LPs back to life, and the sounds fit perfectly as well

Read this review 



The Dr. Robert is a bit of an art piece as well

“The cool-sounding is a worthy and interesting addition to anyone’s stompbox collection.”

Read this review 


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This pedal is just what the doctor ordered.

“Custom FET circuitry provides the sag and sound of tubes, while the middle control increases the sweet saturation effect.”

Read this review 



The Dr. Robert is no one-trick pony. Its overdrive, fuzz, and boost

"The tones within are so close to the Beatles tones I’ve been chasing for decades, and so unique in non-Beatles contexts."

Read this review 


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Sonically, the Dr. Robert is a joyous experience.

“Pushing up the gain yields a suprising amount of grind and sustain. Kicking in the “Mach Schau” boost takes things into another level entirely.”

Read this review 


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Get Inspired With The Dr.Robert Playlist

 

If You Have A Dr. Robert...



Tag your videos & pictures with the hashtags #mydrrobert & #myrigmyrules in social media to get featured!



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