Teisco SX-400 ✅ Anondized Silver Polyphone Synthesizer -Fully Serviced & Checked ✅ RARE Vintage 80s Analog Synth ✅ Massive Unison & Poly Modes ✅ Cleaned & Fully Checked ✅ Worldwide Shipping

🙋🏻‍♂️ Welcome to SynthFreak!

Hey and thank you for visiting my shop and for your interest in this synthesizer! Every instrument in my shop comes from my private collection and is treated with the highest level of care. My mission is simple: you receive a vintage instrument that performs flawlessly, not a "fixer-upper."

Before any item is listed, it undergoes a rigorous, multi-stage inspection by our technician. I know my prices reflect a premium compared to "as-is" listings, but this is a deliberate choice. When you buy from me, you are investing in a fully verified, professionally serviced, and risk-free collector’s item that is ready for the studio the moment you plug it in. You avoid the hidden repair bills and frustration that often accompany cheaper, unverified gear.

💎 Why You Invest in Quality

My pricing directly reflects the extensive time, technical expertise, and premium materials required to deliver an investment-grade instrument. Here is exactly what is included in your purchase:

• 🛡️ Double Technical Verification: Every instrument undergoes a comprehensive checkup before being listed. To guarantee perfection, the entire unit is tested again right before it is packed. Any component replacement, calibration, or restoration is handled by specialists so you receive a turn-key, flawless instrument.
• 📦 Premium Custom Packaging: Vintage electronics are fragile and irreplaceable. To ensure 100% safety during international transit, we do not use standard shipping methods. We spend hours custom-building heavy-duty, multi-layered packaging or bespoke wooden crates. This professional-grade preparation guarantees that your investment arrives in the exact condition described.
• 🚀 Worldwide Fastest FREE Shipping: I believe in delivering excellence to your doorstep without extra costs. Every purchase includes expedited, fully insured worldwide shipping at no additional charge, ensuring your instrument arrives as quickly and safely as possible.
• ⚡ Power & Global Connectivity: My instruments are carefully checked for proper power configuration. Non-EU buyers receive guidance on using appropriate high-quality adapters or transformers where necessary for seamless operation.
• 📑 Customs & Import Optimization: International shipping often brings unexpected financial burdens. Our dedicated logistics team reviews each shipment individually to prepare customs declarations strategically. This compliant, professional approach helps minimize or entirely avoid unnecessary import fees and taxes for you.
• ✅ Transparency & Peace of Mind: I document the entire process and prioritize full professional transparency. You avoid the hidden risks, worn-out components, and immediate repair costs that often come with cheaper 'as-is' listings from private sellers.

Enjoy reading the description.

🎹 Information about the Item for Sale

I am offering the Teisco SX-400, a legendary and exceptionally rare analog polyphonic synthesizer manufactured in Japan in the early 1980s. Built like a tank with a striking industrial silver finish, the SX-400 is an absolute powerhouse of discrete analog design. What makes this synth truly unique are its flexible voice assignment modes—Quad (4-voice polyphonic), Dual, and Mono (unison)—which allow you to configure the oscillators in fascinating ways for massive leads, thick basses, and swirling lush pads.

Equipped with discrete VCOs, resonant 24dB filters per voice, multiple LFOs, responsive aftertouch, and a gorgeous built-in stereo chorus effect, the SX-400 delivers a raw, gritty, and deeply characterful Japanese analog sound that stands proudly apart from its contemporaries.

Technically, this Teisco SX-400 is in excellent operational condition. It has been thoroughly checked, calibrated, and cleaned by our technician to ensure all voice cards, sliders, switches, and patch memories function impeccably. Optically, it is in wonderful vintage condition, retaining its striking industrial aesthetic with only minimal, normal signs of wear from its history.

Please note: This listing includes the Teisco SX-400 and the power cable.

🔌 Rare Japanese Analog Titan

This offering represents an extraordinary opportunity to acquire one of the most sought-after and elusive vintage Japanese poly-synths. Fully serviced, meticulously calibrated, and ready to dominate your studio setup.

⚙️ Specifications

• Type: Vintage Polyphonic/Monophonic Analog Synthesizer
• Manufacturer: Teisco
• Model: SX-400
• Era: Early 1980s (Released ~1981)
• Keyboard: 49 keys with Aftertouch
• Polyphony: 4 Voices with flexible voice modes (Quad, Dual, Mono/Unison)
• Voice Architecture: 1 VCO per voice (Saw, Pulse, Tri waves) + Sub-Oscillator & Noise Generator
• Filters: Resonant 24dB/octave low-pass filter per voice
• Modulation: Dual LFOs and expressive aftertouch routing
• Effects: Built-in Stereo Chorus and Portamento glide
• Memory: User and factory preset memory slots
• Sound character: Gritty, raw, massive in unison mode, and deeply warm analog character

📹 Video Before & After Purchase

Any interested buyer is welcome to request a video demonstration of the instrument.

Additionally, each buyer receives a detailed functional check video before shipping, so you can see and hear your Teisco SX-400 in operation. If any issue is discovered during this final inspection, it is immediately corrected by our technician.

💲 Prices

It is very important that my instruments go into good hands.

• Price proposals are welcome
• If you are seriously interested, feel free to make an offer
• Reasonable proposals will always be considered

⚠️ Information

• All instruments come from my private collection
• The collection is continuously updated
• Each instrument is cleaned, tested, and carefully prepared for sale
• Instruments are protected against dust and damage

📦 Secure Packaging

• The instrument is carefully wrapped in multiple protective layers for safe transport
• Special focus is given to protecting the heavy control panel and keybed assembly
• Fully insured shipping

💢 Shipping

• Best, fastest, and safest shipping option selected depending on destination
• Fully insured shipping
• Export documentation included if required for international shipping

⚡ Power and Connection

• Standard power connection (EU voltage configuration, non-EU buyers please use an appropriate high-quality transformer/adapter if required).

💯 Your Advantages

• ✅ Professionally checked and serviced instruments
• ✅ Tested and cleaned
• ✅ Rare vintage Japanese analog architecture with unique voice modes
• ✅ Worldwide insured shipping
• ✅ Export documents included
• ✅ Verified seller
• ✅ Secure payment
• ✅ Animal-Free & Non-Smoking Household

⛔ What are you waiting for!?

The Teisco SX-400 is an elusive holy grail of 80s Japanese synth design with a ferocious analog bite. Protected by secure, multi-layered packaging, this industrial analog titan is ready to make a massive impact in your studio! 😉