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Dr. Robert: guitar & bass overdrive effect pedal


Dr. Robert


The guitar overdrive pedal that replicates the iconic Vox UL730 used by The Beatles on Revolver & Sgt. Peppers albums!

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Dr. Robert

Dr. Robert

The guitar overdrive pedal that replicates the iconic Vox UL730 used by The Beatles on Revolver & Sgt. Peppers albums!

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Product description

What makes Dr. Robert pedal so special?

- The Dr. Robert is the most accurate replica of the iconic VOX UL730 amp. Made famous by The Beatles as they used it on Revolver & Sgt. Pepper's albums.

- Only 100 units of this amp were produced and most of them were destroyed.

- Klaus Voormann has created the artwork for the Dr. Robert pedal. 

It has not been easy to get here. If you are curious about why and how we got here, we strongly recommend you watching the full series of videos in our Youtube channel talking about all secrets behind the Dr. Robert effect pedal.

Dr. Robert pedal main features

  • Replica of the VOX UL730 S/N: 3042

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.

  • 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.

  • 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...

  • 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.

  • 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 perfectly our Smart Track® pedalboards. Using the side thumb screws you will 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 audio samples

Dr. Robert pedal demos & reviews


Dr. Robert reviews (

Dr Robert pedal review - Aclam Guitars

I own quiet a few distortion and fuzz pedals, and this one is a keeper. Its a bit different than any other fuzz I have used. Seems like its got some compression as you experiment with the mid range knob and adds more fuzz as you turn midrange clockwise when Mach Schau switch is engaged. Does have a unique tone similar to a Vox playing through my fender twin. Very nice pedal, only drawback is price. But I imagine lots of work & experimentation went into this one. Nice Job! 

Aclam Dr Robert pedal review

Great pedal. Gets all of those Revolver sounds and more. Very impressive quality, build, design, and execution. The artwork by Klaus Voormann is a nice touch.

Aclam Dr Robert review opinion reverb

Just as I thought my Casino Elite sounded pretty dang good I plugged it into Dr. Robert and I am now happy as a piggie in Sh*t 

Amazing Dr Robert review reverb

Adds 3 new sounds to my tone, Every setting is musical. Mid knob is the secret weapon

Revolver away dr robert review aclam pedal

What a great pedal! Lotsa good to say about it. It does all it claims and has ALOT of gain. It sounds great clean too.....and the artwork is so appropo. (it wouldn't sound quite as good w/o Klaus' penmanship) I would be very careful with their suggested settings in the manual as the gain is set far too high to mate with your normal amp settings. Before you try them I would suggest turning the volume way down to get a unity gain with your normal amp settings, then add any boost with the pedal. My only downside is that it is pricey, but it took a lot to get it here, if you watch the videos (recommended) and it could take less real estate if it wasn't for the track mount system which I feel few of us have. It is a very un-universal system.

Happy with purchase Dr Robert pedal review

1st rate construction, with a nice throw back sound to the Beatles classic years.

Interesting preamp od pedal dr robert review reverb

It does bring the sound of a very rare Vox UL730. Some of the suggested presets are weird though/ requires some dialing in.

Product features

13.6 x 8.7 x 5.5cm (5.4” x 3.4” x 2.2”) with knobs
1 x Anti-sliding rubber pad & 1 x Velcro® pad
415g. (0.91 lbs)
9V DC Center Negative or a 9V battery
Current Draw
≈35 mA
True bypass


(+34) 93 170 17 67

If you have any question about our products or services, call us or send us an email and we will be happy to help you.

What customers think about this product?

06 Aug. 2019
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06 Aug. 2019
The customer has rated the product but has not posted a review, or the review is pending moderation

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