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Leslie Model 720

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Page last updated Dec 29, 2025

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Description

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The Leslie Model 720 is a staple in the world of keyboard amplifiers, revered for its iconic rotary speaker sound that has defined countless classic recordings. This amplifier is designed to deliver the authentic Leslie experience, combining vintage warmth with modern reliability. Ideal for organists and keyboardists who crave that signature swirling sound, the Model 720 excels in both live and studio settings. Its robust construction ensures durability, while the intuitive controls make it user-friendly for musicians of all levels.

Featuring a dual-channel rotary system, the Leslie Model 720 provides a rich, multidimensional sound that brings your keyboard performances to life. The model is equipped with a horn and rotor, driven by two separate motors, allowing musicians to switch between fast and slow speeds seamlessly. This dynamic range gives you the ability to craft a variety of soundscapes, from subtle modulations to dramatic, sweeping effects.

For those looking to integrate the Leslie Model 720 into their existing setup, it offers versatile connectivity options, including 11-pin and 6-pin connectors. This makes it compatible with a wide range of keyboards and organs, ensuring easy integration into your musical arsenal.

Key Features:

Dual-channel rotary system for authentic Leslie sound
Smooth transition between fast and slow speeds
Horn and rotor driven by independent motors
Versatile connectivity with 11-pin and 6-pin connectors
Durable construction for reliable performance in live and studio environments
User-friendly interface suitable for musicians of all skill levels

Videos

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Adrian Rose

Adrian Rose Hammond XK2 Leslie 720 Tangerine

Adrian Rose

Leslie 720 Demo

John Noxon

Adrian Rose Hammond Aurora Classic + Leslie 720 Parkys Theme.

Adrian Rose

Hammond B200 Leslie 720

Doctor Alex

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Leslie Model 720.

Features and functionality

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The Leslie 720 requires a specific setup with a model 540 on top and is not inherently compatible with Hammond models without modifications.
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The Leslie 720 can be modded to control speed through pin connections: pin 7 or 8 for fast/slow switching, pin 5 to 6 for power on.
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The Leslie 720 has early solid-state amps attached to the metal lower rear panel, which are often considered problematic and are frequently replaced.
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Mods and upgrades

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An 1174 kit is necessary to connect the Leslie 720 to an 11-pin organ or keyboard, requiring correct channeling connections for compatibility.
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Owners recommend building or using a preamp pedal to connect guitars, as the Leslie 720 expects a line level signal, not a direct guitar input.
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It's possible to rewire the 720 and add a Trek LCO crossover to improve functionality, although this approach is not widely advised.
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Software and compatibility

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The Leslie 720 is not suitable for use with a B-3 or other G-G preamp output tonewheel organs without additional modifications.
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Use cases and applications

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The 720 is considered a poor choice for many applications compared to other Leslie models, as it was designed for specific 70s organs.
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The Leslie 720 is noted for its potential in guitar recording, providing a unique sound when used with the correct preamp setup.
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The 720 was originally designed for use with non-Hammond multi-channel organs like Gulbransen and Yamaha, which may limit its appeal for traditional Hammond enthusiasts.
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Setup and maintenance

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Users highlight the need for a preamp to boost guitar signal since the Leslie 720 requires a test signal of 2V@400Hz, which is hotter than a standard guitar output.
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Comparisons

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The Leslie 720 lacks a crossover, unlike models like the 122/147, which affects its ability to deliver the classic Hammond sound without modifications.
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Value and pricing

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Some owners consider the 720 worth purchasing at a low price due to its potential as a cost-effective alternative for hobbyists, despite its limitations.
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