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Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator

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Photo of Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator and more gear in a pedalboard

Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator

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4.5 (15)

4 Reviews

This product is Vintage or Discontinued

Find out who is using Hughes & Kettner Tube Rotosphere MKII

2 community setups

32 wishlisted

53 saved

Page last updated Jul 04, 2026

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Description

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Discover the authentic Leslie tone with the Hughes & Kettner Tube Rotosphere MKII, an Analog Leslie Simulator. This meticulously designed pedal is built around a genuine Hughes & Kettner 12AX7 vacuum tube, visible on the front, setting it apart in the world of Univibe & Rotary Effects Pedals. This second iteration of the Rotosphere includes an innovative guitar/keyboard switch on the top, enabling completely distinct impedance and EQ settings.

Key Features:

Built around a genuine Hughes & Kettner 12AX7 vacuum tube
Fast and slow modes for varied sound options
Rotor balance controls for precise modulation
Separate knobs for drive and output to customize your tone
Innovative guitar/keyboard switch for distinct impedance and EQ settings

Product specs

Bypass	true bypass
Power	9V

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Vintage Stompboxes

Strymon Lex Rotary vs Hughes & Kettner Rotosphere MKII

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PROS

Best roto/Leslie sound, surpassing actual Leslie cabinets
Adds warmth and clarity to the sound
Offers instant control over EQ and signal levels
Remotely controllable, enhancing live performance
Stereo setup creates impressive soundscapes
Effective with both guitar and keyboards
Includes a unique background "wind" noise for authenticity
Drive gain adds nice tonal options

CONS

Bulky and can be a hassle to transport
Limited Leslie spin settings (fast or slow) without speed control
Can be noisy unless modified for lower gain
Fragile power supply unit, not roadworthy

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator.

Features and functionality

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The Hughes & Kettner Tube Rotosphere Mk II requires its own adapter and has been noted for being large and noisy compared to other models.
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User experience

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Owners appreciate the Rotosphere's authentic rotary sound, but find it challenging to dial in due to its complexity.
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Owners mention a preference for the Rotosphere over other analog options due to its unique tonal qualities, despite its bulkiness.
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Comparisons

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The Tube Rotosphere Mk II is considered superior to the Pigtronix Rototron, which fails to deliver a realistic Leslie sound, especially at high speeds.
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The Dynacord CLS222 rackmount unit is mentioned as a comparable product to the Rotosphere, though not necessarily cheaper.
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The Strymon Lex, Leslie G, and Neovent are recommended as high-quality alternatives to the Rotosphere for those not strictly bound to analog.
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Use cases and applications

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Despite its drawbacks, users find the Rotosphere Mk II worth the investment for its unmatched rotary sound, even at a premium price point.
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The Rotosphere is noted for its convincing sound in organ settings, appealing to musicians seeking authentic rotary effects.
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Build quality

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The tube in the Rotosphere Mk II is seen as unnecessary, adding to the pedal's size and power requirements without enhancing sound quality.
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Mods and upgrades

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A suggestion exists to create a Rotosphere-like pedal without the tube for a more compact size and simpler power needs.
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4.5 out of 5

Based on 4 Reviews and 15 Ratings

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jimmarchi1

41029

over 8 years ago

sounds amazing with caveats

I've had this a very long time... it can do a pretty convincing leslie in the right circumstances. Its a little noisey unless you really screw around with the tube in it for the lowest gain option.... the wall wart PSU is chintzy and easy to break on the road. Mine is broken. I'm not sure whats wrong with it but tis ot the tube. It passes signal but the output is crazy low and there's no low end. I don't miss it enough to worry about fixing it. Very cool effect though, just not very road worthy. Mine saw a lot of action on keys, obviously.

Roles:

Guitarist Bassist Keyboardist

Genres:

Electronic Orchestra Alternative rock

jimmarchi1

41029

8 years ago almost 8 years ago

fixed... less noisy now

yannick_robert

105

over 3 years ago

Very close to the true B3

This is the best Leslie sound i ever heard, it give you also a small background "wind" noise, but it doesn't bother more than that, it could actually be a part - like with a true B3 - of the sound.

Roles:

Guitarist

Genres:

Jazz Jazz fusion Fusion

jimmyhaggard

103

almost 9 years ago

Sounds good, but....

It is bulky and a bit of a hassle. There are only two Leslie spin settings: fast or slow. Most of the time, the fast is too fast and there is no way to lower the speed. With the slow spin, many times it is too slow, with no way to increase the speed. It would be a great pedal if there was a control to adjust the spin speed of fast and slow, with no overlap (e.g. fast only slows to a point, and slow only speeds to a point). Meanwhile, the break works great and the drive gain is very nice.