Hammond

The tonewheel organ — jazz, gospel, rock, and everything between

The Hammond organ is the sound of Sunday morning and Saturday night, of gospel ecstasy and jazz sophistication, of rock excess and soul grit. No single keyboard instrument has shaped more genres of popular music than the Hammond B-3 and its tonewheel siblings. Plug one into a Leslie speaker and you've got the most soulful sound ever produced by electricity.

History

Laurens Hammond was a clock maker and inventor, not a musician. When he patented the tonewheel organ in 1934 and founded the Hammond Organ Company in 1935, he was primarily thinking of it as an affordable substitute for pipe organs in churches and homes. The instrument worked by spinning metal tonewheels past electromagnetic pickups — each wheel had a specific number of bumps on its edge that generated a particular frequency. The sound was then shaped by drawbars — sliding controls that mixed different harmonics together, allowing the player to construct timbres from fundamental frequencies and their overtones.

The early models — the Model A, B, and C — found their way into churches, funeral homes, and living rooms across America. But something unexpected happened: jazz musicians discovered that the Hammond organ, especially when pushed hard through an amplifier, had a raw, gritty quality that was utterly unlike the refined sound of a pipe organ. The slight imperfections of the tonewheel mechanism — crosstalk between harmonics, key click from the mechanical contacts, the subtle chorus effect of the scanner vibrato — gave the instrument a complex, living sound that responded to the player's touch in ways that felt genuinely expressive.

Jimmy Smith changed everything. In the late 1950s, Smith developed a virtuosic, bluesy playing style on the Hammond B-3 that single-handedly established the jazz organ trio as a major format. His recordings for Blue Note — The Sermon, Back at the Chicken Shack, Midnight Special — were massive sellers that demonstrated the Hammond's potential as a lead instrument, not just an accompaniment. Smith's influence spawned an entire generation of jazz and soul organists: Jimmy McGriff, Jack McDuff, Richard "Groove" Holmes, Shirley Scott, and dozens more.

The B-3 model, introduced in 1955, became the definitive tonewheel organ. Its combination of two 61-note manuals, a 25-note pedalboard, and the signature drawbar system made it enormously versatile. Paired with a Leslie rotating speaker — whose spinning horn and drum created a complex, swirling Doppler effect — the B-3 produced a sound so rich and three-dimensional that it could fill a room like no other keyboard instrument.

The Hammond crossed into rock music through the British Invasion and the organ-driven sound of the late 1960s. Keith Emerson of The Nice and later Emerson, Lake & Palmer turned Hammond performance into athletic spectacle, literally attacking the instrument on stage. Jon Lord of Deep Purple drove his C-3 through a Marshall stack, creating a snarling, overdriven sound that competed with Ritchie Blackmore's guitar. Steve Winwood, Gregg Allman, and Booker T. Jones all built signature sounds around the Hammond.

Hammond stopped producing tonewheel organs in 1975, transitioning to cheaper transistor-based instruments. The original tonewheels became increasingly valuable on the used market, and today a well-maintained B-3 with a Leslie 122 is one of the most prized setups in all of keyboard music.

Notable Instruments

Hammond B-3

The B-3 is the Stradivarius of keyboards. Weighing over 400 pounds (not including the Leslie speaker, the dolly, or the herniated disc you'll get moving it), it is the most gloriously impractical, stubbornly analog, and profoundly soulful keyboard instrument ever manufactured. And musicians will cheerfully endure all of its physical demands because nothing — nothing — sounds like a real B-3 through a Leslie.

The drawbar system is the B-3's secret weapon. Those nine sliding controls per manual let you blend harmonics in real time, constructing timbres on the fly during performance. Pull out the first two drawbars for a warm, fluty jazz tone. Slam all nine out for a screaming, harmonically complex rock sound. The percussion circuit adds a transient click that gives notes a percussive attack — essential for Jimmy Smith-style jazz playing. The scanner vibrato adds a complex modulation that's more sophisticated than simple tremolo. And the Leslie speaker transforms everything, adding a swirling, three-dimensional movement that makes the B-3 sound alive in a way that recorded music struggles to capture.

The B-3's cultural resume is essentially a history of popular music. Jimmy Smith on The Sermon. Booker T. Jones on "Green Onions." Keith Emerson on "Lucky Man." Jon Lord on "Highway Star." Steve Winwood on "Gimme Some Lovin'." Gregg Allman on "Whipping Post." Billy Preston with The Beatles. Garth Hudson with The Band. The list is endless because the B-3 is endlessly versatile — it can whisper in a ballad and scream in a rock anthem, and it always sounds like the most human of all electronic instruments.

Organ

• B-3000 — Hammond B-3000 solid-state console — B-3 facilities, piano and string voices, transposer, key click, sold with Leslie. Not a tonewheel screamer.

Organs

• A100 — A self-contained tonewheel organ with built-in reverb, amplifier, and speakers, sharing internal design with the B-3. Covers the complete spec table.
• B-3 (1954-1974) — The Hammond B-3 wasn’t just an instrument—it was a sonic revolution, spinning sound from steel and electricity to become the voice of jazz, gospel.
• C-3 (1955-1974) — A tonewheel organ identical in operation to the legendary B-3, favored by rock and prog pioneers for its rich, overdrivable tone.
• E100 — Hammond E100 console organ: 25-note pedals, two full keyboards, built-in rhythm section, 50W, 899 gns at launch. A group organ, not a B-3.
• G-100 — Hammond G-100 — archive sources describe the G-100 name as Yamaha's 100-watt guitar combo, not a Hammond organ. Identity unverified.
• H100 — Hammond H100 — an unresolved entry. Period trade press describes an S-W H100 horn cabinet for PA or instrument use; identity and specs unconfirmed.
• L100 — A spinet tonewheel organ with built-in speakers, produced from 1961 to 1972. Find full specifications and production years here.
• M100 — Hammond M100 spinet tonewheel organ — two 44-key manuals, 13-note pedals, AO-29 tube amp. Production years unconfirmed; restoration costs vary widely.
• M102 — Hammond M102 spinet tonewheel organ — the portable M-series Hammond, period-advertised for quick assembly, listed at £600 average secondhand.
• R100 — Hammond R100 — identity, specs, and years unconfirmed; archive flags R100 schematic references as resistor designators, not product documentation.
• SK1 — A portable digital organ with tonewheel emulation and extra voices, available in multiple keyboard sizes. Find full specifications and production years here.
• X66 — The Hammond X66 (1967–1973) was Hammond's most expensive organ, featuring 12 tone wheels, four drawbar sets, and 18 presets.
• XK-3 — Hammond XK-3 digital tonewheel organ (c.2005) — a single-manual alternative to the New B3 with modelled tonewheels, Leslie simulation, and MIDI.
• XK-5 (2016) — A digital organ using modeled tonewheel technology, designed for portability and expandability. Find full specifications and production years here.
• XM-1 — Hammond XM-1 drawbar organ module from the mid-1990s, known from Sound on Sound review and UK retailer ads. Limited real-time controls; companion XMc-1 added physical drawbars.

Synthesizer

• DPM-48 — Hammond DPM-48 digital drum machine — 22 pads, 8 outputs, 84K EPROM samples, RAM cartridge storage. Reviewed by E&MM in 1984.

Synthesizers

• Novachord — A 72-note polyphonic electronic instrument using 163 vacuum tubes, first shown at the 1939 New York World's Fair. This page has full specifications.

Unknown

• 125E — Hammond 125E universal output transformer — 15W per unit, 4/8/16Ω secondaries, ~200pF interwinding capacity, documented in period DIY amplifier builds.

Other Models

• B-200 — Hammond B-200 portable organ — harmonic percussion, variable key click, 44/49-note manuals, 13-note pedals, paired with the 215W Leslie HL-822.
• T-500 — Hammond T-500 tonewheel spinet organ — 74 tonewheels, two manuals, Rhythm III auto chording, built-in cassette deck. Early 1970s; often free on the used market.
• T200 — Hammond T200 spinet organ — first Hammond of its size with a built-in two-speed Leslie, drawbars, LCD, 11-pin Leslie out.