CYBER WEEK SPECIALS NOW AVAILABLE

Programmed for the past, present and future.

MODERN UPGRADES AND RESOURCES FOR A LEGENDARY INSTRUMENT

Programmed for the past, present and future.

In 1984, Kurzweil introduced a new industry standard of sampling excellence, with future-proof expansion. The music world has undergone vast changes since 1984, but the K250 and 250RMX are still respected for leading us into the world of digital music technology. Forty years later, the K250, is being born again to keep pace with the past, present and future of music synthesis. We’ve developed powerful new sound memory boards that vastly extend the K250’s memory via USB with gigabytes of space available for sounds created over the last 40 years and far into the future. With these updates, the K250 becomes more than a collectible. Learn more about our new UltraMEM and UltraROM installation kits and other upgrades– which are continuously being updated. Today, your K250 can live up to its full potential and thrive.

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Made for your K250

Four brand new products designed to transform your classic Kurzweil K250 synthesizer into a modern powerhouse while preserving its legendary character.

Ultra MEM Kit

Massive 24MB battery-backed SRAM expansion providing up to 14 sound block locations. Load all ROM-based sounds that were ever available for the K250, plus new sounds never before possible. Includes microSD backup and sampling banks without compromising resident sounds.

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Ultra ROM Kit

Enhanced ROM board featuring advanced diagnostic capabilities previously restricted to service centers. Unlock deeper system analysis and troubleshooting tools while maintaining full compatibility with original K250 architecture.

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CYBER WEEK SPECIAL

Ultra Bundle Kit

The K250 Ultra Bundle offers a comprehensive upgrade package for your Kurzweil K250 synthesizer, combining both the UltraRom and UltraMem add-on boards in one convenient set with a special discounted price. This bundle not only enhances your instrument's memory capacity and functionality, it also provides access to advanced diagnostic features. Designed for professionals seeking to maximize their synthesizer's performance, the K250 Ultra Bundle delivers superior reliability and seamless integration.

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Slider Board

Brand new precision slider board engineered with modern components and improved tactile response. Replace worn sliders with smooth, reliable controls that restore your K250's hands-on performance capabilities.

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ON SALE

USB Panel Kit

Up-to-date USB communication interface enabling effortless loading of ROMs, sounds, and samples. Bridge the gap between vintage hardware and modern workflow with plug-and-play connectivity.

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CYBER WEEK SPECIAL

K250 Sheet Music Holder

A brand-new music holder designed specifically for your K250 is now available. Made from high quality acrylic.

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Professional Recording Grade Audio Jack Board

A superior replacement audio jack board for your K250 with balanced TRS outputs, 48V phantom power, Lehle transformers, built-in DI boxes. No-solder installation.

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Audio Jack Board Upgrade

Kurzweil K250 replacement jack board enhanced with. Active feedback driver, balanced TRS outputs, 48V phantom power, DI boxes, ground lift and more.

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Anti-Aliasing Filter Replacement module

Replacement for Reticon R5609 filter in the Kurzweil K250. This MAX291-based upgrade delivers 20dB lower distortion, 15dB lower noise. Includes socket.

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CEM3335 Voltage Controlled Amplifier Replacement

SSI2161 VCA upgrade replacing the original CEM3335 in the Kurzweil K250. 15dB better dynamic range, 12dB+ hiss reduction. Available single or 8-module complete kit.

Coming Late October 2025

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Technical Documentation

Installation videos and
technical PDF library

K250 History

Read about the history of this groundbreaking instrument

K250 Resources

Browse our archive of
K250 literature
high resolution scans
reference photographs & more