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Availability:
In Stock.
Arrives
Friday, May 29
Features
- Tri-Mode Sound Customization Choose from Classic, Modern, or Solid-State modes to fine-tune your listening experiencefrom tube warmth to analytical precision.
- Gen5 Nutube 6P1 Tube Integration Delivers authentic vacuum tube character with enhanced durability, clarity, and harmonic richness in a compact form.
- Dual DAC + Discrete Class A Amp Features an in-house R2R DAC and fully balanced 4-channel Class A amplification for powerful, natural, and clean output up to 730mW.
- High-Res Support & Versatile I/O Supports PCM 768kHz, DSD512, and DoP formats with 3.5mm SE and 4.4mm balanced outputs, plus the latest XMOS XU316 USB processor.
- Premium Build with Smart Features Compact CNC-machined aluminum chassis, OLED display, magnetic mount, and audiophile-grade components for form and function.
Manufacturer: Cayin
Brand: CAYIN
Mfr Part Number: RU9
Model Number: RU9
Item Weight: 0.37 Kilograms
Built-In Media: DAC Amplifier
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, May 29
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Out of all CAYIN Dac Amps . The RU9 is the most Analog sounding . it’s the warmest .the most musical out of them . But , there all great in there own way . The RU6 (R2R) is my fav and the RU3 . Now the RU9 is my #1 . Then my #2 is RU3 then RU6 . The RU7 is too neutral .even though it’s good also and I do use it depending on what IEM I’m using . RU7 has great Mids and natural tonality . But I prefer warm sources . More musical sound preference. And this RU9 has that Warm tube Bloom that’s noticeable . Even on the modern mode it’s warm Analog sounding . And on the normal mode with AKM chips . It’s Analog with rich depth and very musical . Despite the battery only being 3-4 hours it doesn’t bother me cuz I use it connected to my phone via USB C and the battery doesn’t drain . But I love the triple timber choices . I like the magnet on the case and it works very nicely . The RU9 is well built and I love the Tube Bloom it gives to the music and vocals ! I’m a CAYIN Fan . And they make great products . My next buy is the CAYIN N7+ master quality DAP . Also thanks to Musicteck ! They have the best Audiophile selection of Dac Amps and Daps and IEMs and Headohones .
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Reviewed in the United States on January 9, 2026 by REECE
Incredible audio quality in transistor mode as well as the two tube modes, classic and modern. I am a retired musician that has done his fair share of mixing and mastering in the day. The Classic mode really lets The.Nu-Tubes shine with the most tube like experience with more midbass punch and a nice glow and smoothing the highs and uppers without sacrificing detail. The modern mode is a nice mix of the classic mode and transistor mode combined. The Bluetooth connection has been rock solid, even when using.LDAC..Yes, this piece of kit is pricey at $500 but it is truly worth every penny if you’re into Audio as much as I am. I give this RU9 by highest recommendations.
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Reviewed in the United States on November 28, 2025 by fiddler59
Using Meze Strada single-ended in low power and traditional tube mode. Many always go straight to balanced on everything but then they some of the musical aspects of music. They keep chasing what is unattainable and should consider chilling.
Reviewed in the United States on February 2, 2026 by tyler
Es más de lo que uno podría suponer.... Sencillamente fantástico!!!, hay que escucharlo para creerlo.
Reviewed in the United States on September 1, 2025 by Dhyan
I bought this because of the tubes and the fact that is had a coaxial output. I figured I'd be able to use this for my headphones and my car straight into my DSP. I loved how portable it is and the magsafe feature. The device sounds clean when tubes aren't engaged but unfortunately the tubes don't engage when using the coaxial. Also, the classic mode smeared things too much. The modern mode was the best, but it didn't dull sharpness enough for me to want to keep a tube in my signal chain. This kind of power can be had for much cheaper through the fiio qx13.
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Reviewed in the United States on November 10, 2025 by Chi Guy
This thing sounds awesome, love the magnet. For $500 it should have a PEQ function.
Reviewed in the United States on November 8, 2025 by Shopper6592