🔧 Service & Condition

This Sequential Circuits Prophet-600 has been inspected and serviced in Japan by Good Mark. We focus on ensuring these vintage instruments are ready for practical use. GliGli V2.0 Mod (Teensy) Installed: Upgraded with the GliGli v2.0 firmware. Replaces the original Z80 CPU, providing high-resolution parameter control, faster envelopes, and expanded LFO modulation capabilities. Battery-Free Flash ROM Conversion: With the Teensy hardware upgrade, patch memory is now stored in non-volatile flash ROM. The internal backup battery is no longer needed, permanently eliminating the risk of battery leakage and patch data loss. Keybed & Operations Tested: All keys trigger cleanly, MIDI In/Out is fully functional, and all front panel pots, switches, and membrane buttons respond properly. Internal & External Check: Cleaned and inspected for reliable operation.

⚠️ Important Notice for Vintage Users (Please Read)

GliGli Specifications & Functions: Due to the GliGli modification, certain knob assignments differ from the original factory layout, and the original internal sequencer is disabled. Operation and feature support cannot be provided; please utilize the included manual or community/AI resources. Oscillator Frequency Offset (Normal Analog Trait): Due to the inherent individual characteristics of the analog CEM3340 VCO chips, there is a slight offset in the Frequency knob markings between Oscillators A and B. Setting Oscillator A to "0" and Oscillator B to "1" produces the exact same reference pitch. This is standard analog circuit behavior and is not a defect. Pitch Wheel: The center click and spring return feel slightly light. The internal spring can be adjusted to increase tension, but the unit is kept and sold as-is. Right Wood Panel: The right-side wood end panel has a crack that was repaired using wood glue. Please inspect the photos carefully for details. Unconfirmed: TAPE LOAD/VERIFY functions are untested. Standard data management is handled via MIDI. Vintage Nature: Sold strictly as-is due to the nature of vintage electronics.

➡️ Accessories

Prophet-600 Unit (Power cable directly attached)

GliGli User Manual (English hard copy)

⚡ Voltage

100V AC (Japanese domestic model). A quality step-down transformer is required for use in 120V (US) or 220V–240V regions for safe and stable operation.

💡 Discount Hint for European & Asian Buyers

For buyers in Europe and Asia, we can often provide a better price (10-15% OFF) depending on your shipping zone. Please use the [Make an Offer] button!

🚚 Shipping & Taxes

Free Express Shipping via FedEx/UPS/DHL with tracking and insurance. 🇺🇸 For US Buyers: NO additional import duties at delivery! We ship via DDP (Delivered Duty Paid). We cover all import duties and handling fees. (Sales Tax collected by Reverb is separate). 🌎 For International Buyers (Outside US): Import duties, taxes (VAT), and customs fees are the buyer's responsibility. Please check your local customs rates before purchasing.

📦 Packaging:

The unit will be securely packed with multiple layers of protection and a reinforced box.

📩 Feel free to message us with any questions.

🎹 Thank you for your interest in this upgraded Sequential Circuits Prophet-600.

– Good Mark