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Dr. Robert: Replicates the legendary Vox UL730 used by The Beatles

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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The story behind the Dr. Robert effect pedal

Get immersed & discover the creaton process in the story of a vintage enthusiast and a circuitry master, pursuing the tone that has dazzled countless guitarists around the globe. Learn how this could be achieved in this six-episode documentary full of anecdotes, ups and downs, and eventually the accomplishment of what began as a long-time obsession.

 

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 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.

 

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


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

Paperback Writer

Epiphone Casino

Gretsch 6120

Gretsch 6120 PepBox

She said she said

Epiphone Casino

Gibson SG

Rain

Epiphone Casino

Dr. Robert

Epiphone Omni

 

Taxman

Strato Omni

Taxman (solo)

Stratocaster

Sgt. Peppers (Rythm)

Epiphone Casino

Sgt. Peppers (Lead)

Epiphone Casino Solo

Fender Stratocaster Solo

 

Demos and reviews of the Dr. Robert pedal

What customers think about our products?

Dr. Robert

01 July 2020 Chang Ling Fatt

Must own pedal!

I bought the pedal through online store. Customer service is very responsive and friendly. The delivery via Fedex was faster than expected. I played with the pedal non-stop after receiving. It is a faithful recreation...

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Dr. Robert

18 March 2020 Paul Carey

exceptionally good distortion pedal

Sure, there is the direct Beatles influence in designing this pedal, which is part of what made me get it, but there is really much more.Ive always loved those sounds on Revolver and Sargent Peppers and never...

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Dr. Robert

28 Jan. 2020 richard bondel

Dr Robert

It seems like a lot of money for a distortion pedal but it offers something different and it's very well made. You have to remove the back to access the battery compartment, which is time-consuming, but you get to see...

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Dr. Robert

27 Nov. 2019 Ola Göransson

Special pedal

It’s rare that I buy a pedal that gets more than occasional usage. Especially overdrives. This one, however, is So good it could be constantly engaged. With the eq function it is really versatile

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Dr. Robert

08 Nov. 2019 William Richins

Dr Roberts pedal

Another great pedal from a company that exceeds customer expectations.

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Dr. Robert

16 Oct. 2019 Daniel Carollo

dan

great pedal and service

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Dr. Robert

28 Aug. 2019 Richard Lloyd

Great pedal

Sounds amazing and works great. Have yet to run through all it’s paces. Very easy interface. No retreat on this purchase

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Dr. Robert

27 Aug. 2019 Drew Cole

Very satisfied

I’m giving this product a five out of five. The sounds are extremely authentic and paired with the right pick ups it’s dead on perfect. The packaging is fantastic and the box comes with beautiful touches and a...

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Dr. Robert

06 Aug. 2019 Robert Gonzalez

Dr. Robert

Beautiful pedal! Really gets the 7-series sounds I've been chasing all these years. Aclam customer service is excellent!

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Dr. Robert

06 Aug. 2019 Graeme Wells

Dr Robert Rocks

This is an amazing Pedal. Authentic & Versatile. Blown away.

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

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."

Premier Guitar (Premier Gear)

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.”

Guitar Player

Read this review 


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Guitar world logo

"Here's your prescription to replicate The Beatles’ Vox UL 730 amp sounds"

"An obscure and largely forgotten amp gets rightly put back on the map in a versatile drive pedal with visceral power and a raw grind that will find a role in many kinds of music."

Guitar World

Read this review 


Sonically, the Dr. Robert is a joyous experience.

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

Interactive Guitar magazine

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.”

Maverick magazine

Read this review 


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”

Pedal of the day

Read this review 


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Setting up on a pedalboard



Take advantage of our custom enclosure to attach the effect pedal to your pedalboard.

We incorporated a proprietary locking system which allows the user to fasten the pedal without the need of using the typical hook and loop method. This custom fastening system follows the same philosophy behind the Smart Track fasteners but integrated in the enclosure reducing the space occupied by each pedal.
That translates into more pedal density for the same space, and who doesn’t want that? We strongly recommend you to take a look at our line of pedalboards, which are the best complement to our pedals!

velcro pedalboard attach effect

Velcro pedalboard

Take the included super strong Velcro® pad and stick it on the base plate. Again, make sure the base is clean of dirt and dust.

how to attach aclam pedal to smart track pedalboard

Smart Track pedalboard®

Add the anti-sliding rubber pad at the bottom of your pedal, specially shaped for this unit. Surface must be clean and dry before applying adhesive pad.

Loosen the 2 thumb screws to unlock the bottom pieces out of the pedal. Place the pedal, inserting the bottom pieces inside the grooves.

Move the pedal to its final position. Tighten the two thumb screws with your hands or with a screwdriver.

Install_pedal_wood_pedalboard

DIY woodboard

You can screw the pedal directly to your pedalboard with wood bolts through the enclosure side holes.

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Get Inspired With The Dr.Robert Playlist

 



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