Elka Rhapsody (1974–1980)

That lush, wobbly string pad you just heard? There’s a good chance it came from this Italian workhorse with a split personality and a growl like a cello in a thunderstorm.

Overview

The Elka Rhapsody isn’t just another string machine—it’s a chameleon. Born in Italy during the mid-1970s synth explosion, it split the difference between organ, string ensemble, and keyboard hybrid in a way few others did. Officially known as the Rhapsody 610 and Rhapsody 490, these weren’t just variations on a theme—they were different beasts for different players. The 610, with its 61-key span, offered a splittable keyboard and four distinct sounds: lush strings, rich violoncello, a surprisingly serviceable analog piano, and a clavichord that leans more toward harpsichord, especially as heard on tracks like The Yardbirds’ “For Your Love.” The 490, its little brother, trimmed the fat—49 keys, no split, and only the string and cello voices. But don’t let the simplification fool you: under the hood, they’re nearly identical, right down to the circuitry. In fact, the Hohner StringVox? Same machine, different paint job—black for Elka, beige for Hohner, with German switch labels. That’s how close they are.

What sets the Rhapsody apart isn’t just its sound, but its architecture. Unlike synths that layer square waves or use complex oscillators, the Rhapsody works like an organ at heart: a master top octave generator feeds pitch data to divider chips, one for each key, each living on its own tiny voice board. There are 61 of these little boards in the 610 model, labeled A through Z (with I, J, K, Q, V, and X missing), each subtly tuned to filter the sound differently across the keyboard. The lowest five keys share the same board type (A), while the top few use Z boards. This zoning gives the instrument a dynamic character—warm and rounded down low, bright and cutting up top. And then there’s the chorus: a double-stacked, multi-speed beast that adds both "life" and "ensemble" via a fast modulator, plus a slow one for that signature "slow beating" effect. It’s this chorus that keeps the long, organ-like releases from sounding sterile—instead, they breathe, they shimmer, they haunt.

And yes, it’s stable—mostly. Owners report it as a very pitch-stable instrument, though there’s a quirk in early 1975 units: the F#/Gb note runs nearly 6 cents flat. Not catastrophic, but noticeable to a trained ear or when playing with other instruments. Still, once warmed up, it holds its ground. The keyboard action? Great, if a bit dusty after decades—easily cleaned, and the chassis, while described as "rugged and very strange," opens up with just four screws. Two on top, two underneath, and you can flip the keybed up like a hood to access those voice boards. Need to fix a dead clavinet note? Swap the voice board with one from a less-used key in the same range—Elka built in a kind of modular repairability that was ahead of its time.

Specifications

Key Features

Split Personality, Literally

The Rhapsody 610 wasn’t just about more keys—it was about control. With a splittable keyboard (2/3 octaves), you could run violoncello in the left hand and strings or piano in the right, each with its own volume slider. Four sliders in total let you balance the two split zones and the two sound layers independently. This made it a live favorite—Tangerine Dream’s Christopher Franke used it in every concert from 1975 into the early '80s, layering textures on the fly. The 490, lacking this split and the piano/clavinet sounds, was simpler but still powerful for pure string work.

Chorus That Moves

The double chorus isn’t just an effect—it’s the soul of the Rhapsody. One modulator runs fast, adding "life" and "ensemble," while the other crawls, creating a slow, pulsing "beating" that mimics the natural imperfections of a string section. Early units used an ITT ICA350 delay chip (a round, six-legged module), while most others used the 8-pin ICA350Y (with only six pins active). This chorus is why the Rhapsody never sounds like a flat organ—even with long, sustained notes, it feels alive, organic, almost human.

Modular Repairability

Each key has its own voice board—61 in the 610, each labeled A-Z (with gaps). If a note flubs on clavinet but works elsewhere, you can swap boards. No need to trace a failed transistor or capacitor across a dense PCB—just lift the keybed, unplug the board, and swap it with a spare from a less-used key. This design, while labor-intensive to manufacture, is a godsend for restorers. The same goes for the LFO board, which sits on its own module and can be easily modified—some units even have added trimmers for fine-tuning modulation depth.

Generation Gap

There’s a quiet divide among collectors: 1st vs. 2nd generation. Units with serial numbers below 5000 (like #3786) are considered "1st Generation"—they have colored buttons on the left side and, according to some, a "more raw and rich sound in the harmonics." After 1975, the circuits were repositioned: modulation boards moved from behind the divider circuits to under the keyboard, and the master oscillator changed from the S2555/S2556 chip combo to the AY-1-0212 (General Instruments). The 1975 version ran at 2 MHz; later models dropped to 667.527 kHz. Whether this shift degrades the sound is debated, but the consensus leans toward the early models having a slightly more aggressive harmonic character.

Historical Context

Elka wasn’t a synth pioneer—they were organ builders first. The Rhapsody emerged right as the market boomed for keyboards that emulated string instruments, and it became one of the most widely spread string machines of its time, sold by the thousands. It gave Elka a foothold in the professional keyboard market—so much so that the company leveraged its success to fund the development of the legendary Synthex. The Rhapsody was famously the only identifiable keyboard in Tangerine Dream’s onstage rig, a testament to its reliability and sonic signature. Artists like Jean-Michel Jarre, Klaus Schulze, Vangelis, and Tony Banks of Genesis all reached for it, drawn to its deep, growling bass and shimmering highs. Supertramp used it too, and Claudio Simonetti of Goblin wielded its textures in horror soundtracks where atmosphere was everything.

Collectibility & Value

The Rhapsody has a cult following, and for good reason: it sounds tremendous, especially when layering all four sounds. The violoncello has a "deep and gravelly" bass end that delivers a "tremendous 'growl,'" while the strings are lush and haunting. The piano is… well, it’s there—functional, analog, but not a stage piano replacement. The clavinet? Not as funky as a Hohner D6 or E7, but perfect for that mid-70s Tangerine Dream vibe on albums like *Encore*. The 1st Generation units are especially prized for their richer harmonic character, though the flat F#/Gb in 1975 models is a known tuning flaw.

Maintenance is manageable but requires attention. The non-detachable power cord is a liability—rewiring may be needed. The volume pedal uses an LDR (B8-731-03 from Phillips) and a bulb, both of which can fail over time. Divider chips (ITT SAY110 or SAJ110) are known weak points; the SAJ210 is a more reliable replacement. But the modular voice boards make troubleshooting easier than most string machines. A Tubbutec MIDI retrofit exists, adding modern control without gutting the original circuitry—a smart upgrade for players who want vintage tone with contemporary integration.

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Service Manuals & Schematics

• Schematic — archive.org
• Schematic — archive.org
• Schematic — archive.org

Related Models

• ARP String Synthesizer (1975)