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Open box in stock, ready to ship
Out of stock - Accepts Pre-Orders
In Stock and Ready to Ship
Ships in 1 to 3 business days. Monday to Friday, except bank holidays. Subject to stock availability and security checks.
- Open box
Out of Stock - Allows Pre-Orders
Message us in discord or our website chat to find out pre-order time.
- New
Cayin RU9 - Portable Nutube Headphone DAC/AMP
Portable Tube/Solid-state DAC/Amplifier
- Nutube 6P1 Application
- Dual AKM AK4493SEQ DAC
- 16-Core XMOS XU316 Processor
- Triple Power Supply Modes
- Magnetic Back Design
- USB Audio DAC
VAT and Duties Included for UK and Eligible EU Customers.
If you are outside the UK or EU, the price does not include any taxes. Local taxes and import duties will be extra. They will be raised by the local authorities and billed directly to the customer.
VAT and Import Taxes FAQ
Cayin RU9 - Portable Nutube Headphone DAC/AMP
Preorder Coming Soon
Experience the Future of Portable Hi-Fi with Tube and Solid-State Precision
Get ready to elevate your listening experience—the Cayin RU9, a groundbreaking Tube/Solid-State DAC Amplifier, is opening for preorder soon. This high-performance portable device is powered by the Nutube 6P1 and lets you seamlessly switch between tube and solid-state modes on both single-ended 3.5mm and balanced 4.4mm outputs. It features three distinct sound signatures—Classic, Modern, and Solid-State—catering to every audiophile preference.
Classic mode offers rich harmonic warmth and vintage THD characteristics, Modern mode balances tube sweetness with reduced distortion, and Solid-State mode delivers ultra-clean, neutral playback using precision op-amps. With dual AKM AK4493SEQ DACs operating in mono and a 16-core XMOS XU316 processor for pristine digital decoding, the RU9 sets a new standard for portable audio fidelity.
Compact, Powerful, and Thoughtfully Engineered
Designed for Audiophiles, Built for the Road
The RU9 isn’t just about sound—it’s built for real-world use with a robust set of features tailored to both audiophiles and mobile users. Its triple power supply system includes a built-in 2000mAh battery, USB power bypass, and external DC input with QC/PD fast charging. Activate Hyper Mode under DC power to unlock its full potential, pushing out up to 1170mW per channel in balanced mode.
The Nutube is protected by a custom anti-vibration system for clean, microphonic-free playback. Weighing only 150g and enclosed in a CNC-machined unibody chassis, the RU9 also includes a magnetic back for smartphone attachment, a premium leather case, a 0.96” color display, tactile volume knob, and multicolor LED indicators. Fully compatible with UAC1.0/2.0 USB, S/PDIF, and high-definition Bluetooth via Qualcomm QCC5125, the RU9 delivers elite performance wherever you go.
Nutube 6P1 Application
Classic：
No global negative feedback; each stage uses local feedback. Tube amplification introduces higher total harmonic distortion (THD). Rich harmonic texture delivers a warm, nostalgic sonic flavor — classic “tube sound.”
Modern：
Introduces global negative feedback to define total gain. THD is significantly reduced. Harmonically cleaner, quieter background while preserving the warmth of tubes. Yields a sweet, clear, and delicate modern tube audio signature.
Solid-state：
Based on precision-tuned op-amp ICs and peripheral circuits. Offers neutral tonality, fast transients, and highly accurate audio reproduction. Ideal for listening to music with its original, uncolored character.
Dual AKM AK4493SEQ DAC
Equipped with dual AK4493SEQ DACs, each operating in mono mode. Left and right channels are decoded separately for lower crosstalk and better channel separation.
16-Core XMOS XU316 Processor
Employs the latest generation XMOS XU316 USB Audio solution for high-performance digital processing.
Triple Power Supply Modes
Built-in 2000mAh lithium battery provides up to 4.7 hours of battery-powered use. Also supports USB power from the external device (without charging the battery), as well as external DC power supply for increased output power. Compatible with QC/PD fast charging.
Hyper Mode
A specialized feature designed for headphone usage under DC power supply. Increases static operating current and voltage for enhanced audio performance.
- Balanced: 1000mW + 1000mW @ 32Ω; 1170mW + 1170mW @ 16Ω
- Single-ended: 420mW + 420mW @ 32Ω; 610mW + 610mW @ 16Ω
Magnetic Back Design
Magnetic rear panel allows seamless attachment to smartphones. Includes a custom Cayin leather case — hand-stitched, supple leather, precise cutouts, and magnetic back for secure attachment.
Comes with a L-shaped USB cable, ergonomically angled to avoid hand obstruction.
Custom-designed anti-vibration system for the Nutube vacuum tube. Features a custom-built silicon housing on an FPC flexible PCB and a pin-supported vertical suspension system to eliminate microphonics.
USB Audio DAC
Supports UAC1.0 (driverless) and UAC2.0 modes.
Compatible with smartphones, computers, digital audio players, tablets, and gaming consoles.
Uses Qualcomm QCC5125 for high-definition Bluetooth transmission.
Supports LDAC and other HD Bluetooth codecs
Customer reviews
Shipping, returns & warranty
- Dispatch
- 1–3 business days In-stock items, Monday to Friday except bank holidays, subject to stock and security checks.
- Delivery
- Tracked or signed Delivery options and costs are shown at checkout. We don't profit from shipping charges.
- Returns
- 14 days For electronics such as DACs, amps and players, in like-new condition with all original packaging and accessories.
Good to know
- Return shipping is paid by the customer.
- Open box, B-stock, refurbished and clearance items can't be returned.
- Please add a valid phone number at checkout in case we need to verify your identity.
- New products
- 1-year manufacturer warranty Most products. The exact warranty is set by the manufacturer.
- Pre-owned & open box
- 3 months B-grade, open box, refurbished, ex-demo and second-hand items.
- Covered
- Defects in materials, parts and workmanship
- Not covered
- Accidents, misuse and unauthorised repairs Including abnormal conditions, deliberate abuse and operator error.
- Making a claim
- Send it to us, we ship it back free You cover shipping to Elise Audio; we pay to send the repaired or replacement product back.
Open box, ex-demo and B-stock options of this product come with the 3-month warranty.