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Yamaha / Synthesizers

GX-1

The Yamaha GX-1, first released as Electone GX-707,[a] is an analog polyphonic synthesizer developed by Yamaha as a test bed for later consumer synths and Electone series organs for stage and home use. The GX-1 has four synthesizer "ranks" or three manuals, called Solo, Upper, and Lower, plus Pedal, and an analog rhythm machine. The GX-707 first appeared in 1973 as a "theatre model" for use on concert stages, before the GX-1 was publicly released in 1975.

Origins

Yamaha introduced the GX-1 in 1973 as the most ambitious and expensive synthesizer ever commercially produced. This dual-manual polyphonic organ/synthesizer hybrid weighed over 300 kg and cost approximately $50,000—roughly the price of a house in 1973. Only approximately 100 units were manufactured, making it one of the rarest production synthesizers in existence.

Design & Technology

The GX-1 features two 61-note manuals and a 25-note pedalboard, with eight voices of polyphony per manual. The synthesizer engine combines elements of Yamaha's Electone organs with dedicated synthesizer sections, including envelope generators, filters, and multiple oscillators per voice. The pedalboard has its own synthesizer section with independent controls.

The instrument includes a Leslie speaker system, multiple amplifiers, and an extensive control panel with hundreds of sliders and switches. The build quality and engineering represent the absolute pinnacle of 1970s analog synthesizer technology.

Production History

Yamaha produced approximately 100 GX-1s from 1973 to 1982. The instrument was custom-ordered and built to specification for wealthy customers, including John Paul Jones of Led Zeppelin, Stevie Wonder, Keith Emerson, and various wealthy Japanese collectors. Each unit required extensive custom installation.

Notable Users

Stevie Wonder's GX-1 is perhaps the most famous, appearing on his 1970s classics. John Paul Jones used Led Zeppelin's GX-1 on "All My Love." Keith Emerson's GX-1 was featured in ELP performances. The instrument's rarity and expense ensured that only the most successful musicians could acquire one.

Cultural Impact

The GX-1 represents the absolute extreme of analog synthesizer ambition and expense. It stands as a monument to an era when analog electronics were pushed to their absolute limits. The instrument's influence on subsequent Yamaha designs is significant, with many GX-1 concepts appearing in later CS-series synthesizers.

Market & Collectibility

GX-1s are effectively priceless—no complete systems have appeared on the open market in decades. Individual components occasionally surface from decommissioned units. The instrument is among the rarest and most valuable synthesizers in existence, with estimated values exceeding $100,000 for complete, functional systems. The GX-1 is a museum piece rather than a practical musical instrument.

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