SKU: 48233428060

Cayin RU9 Vacuum Tube Portable DAC and Amp

$29250.00 $32500.00
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Ships within 48 hours · Estimated delivery Jul 20 - Jul 25

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Description

Cayin RU9 Vacuum Tube Portable DAC and AmpDescription The Cayin RU9 is the latest addition to the RU series. It is a compact, portable DAC and amp that brings the classic tube sound to your mobile audio experience. Featuring the Korg NuTube 6P1 vacuum tube, the RU9 offers audiophiles a unique blend of classic and modern sound signatures. Get this amazing DAC AMP now from the official dealer of Cayin in Bangladesh, Gears for Ears today with an official 1 year warranty. First portable DAC Amp

Description

The Cayin RU9 is the latest addition to the RU series. It is a compact, portable DAC and amp that brings the classic tube sound to your mobile audio experience. Featuring the Korg NuTube 6P1 vacuum tube, the RU9 offers audiophiles a unique blend of classic and modern sound signatures. Get this amazing DAC/AMP now from the official dealer of Cayin in Bangladesh, Gears for Ears today with an official 1 year warranty.

  • First portable DAC/Amp to implement a Korg NuTube 6P1 Tube
  • High-performance dual AK4493SEQ DACs
  • Three timbre options: Classic, Modern and Solid-State
  • Magnetic back design allows smartphone attachment

Classic. Modern. Solid-State.

The RU9 offers users three distinct timbre options: Classic, Modern and Solid-State. As the name implies, the Classic tube mode delivers a warm, nostalgic sonic flavor - the classic tube sound.

The Modern tube timbre yields a sweet, clear and delicate modern tube sound signature. It's harmonically cleaner, offering a quieter background while preserving the warmth of tubes.

The Solid-State mode is ideal for listening to music with its original, uncolored character. It delivers neutral tonality, fast transients and highly accurate audio reproduction.

NuTube 6P1 Application

The tube circuit adopts a three-stage amplification architecture, consisting of 6 Toshiba 2SK209 audio-specific junction field effect transistors (JFETs) and a manually tested paired KORG Nature 6P1 dual triode tube. Both the single-ended and balanced ports on the RU9 can output rich tube sound.

Premium Components

With years of experience crafting high-end audio equipment, Cayin has applied their expertise to engineer the RU9 with exceptional components. RU9 is equipped with dual Equipped with dual AK4493SEQ DACs, each operating in mono mode. The Left and right channels are decoded separately for lower crosstalk and better channel separation.

Employing the latest generation XMOS XU316 USB processor, RU9 supports native DSD512 and 32bit/768kHz PCM signals. The processed signal is then amplified by a four-channel balanced headphone amplifier circuit. It uses dual ultra-low noise and ultra-low distortion OPA1662 OPAMPs with four Nexperia audio power tubes.

Triple Power Supply Modes

The built-in 2000mAh lithium battery offers up to 4.7 hours of playback on a single charge. The RU9 also supports USB power directly from connected devices (bypassing the battery), as well as an external DC power supply for enhanced output performance. It is fully compatible with QC and PD fast charging standards.

Hyper Mode

A specialized feature designed for headphone usage under DC power supply. It increases static operating current and voltage for enhanced audio performance. Producing a strong output, it reaches 1000mW at 32Ω impedance load.

Versatile Use Scenarios

The RU9 is compatible with smartphones, computers, digital audio players, tablets and gaming consoles. A magnetic rear panel allows seamless attachment to smartphones. RU9 supports UAC1.0 (driverless) and UAC2.0 modes.

Vibration Isolation

A custom anti-vibration system was designed for the NuTube vacuum tube. It features silicon housing on a FPC flexible PCB and a pin-supported vertical suspension system to eliminate microphonics.

Thoughtful Details

RU9 features a 0.96" color display with adjustable brightness, knurled volume knob and side-mounted indicator light for charging + sample rate/format display.

Specifications
  • Material: CNC-machined unibody metal chassis
  • DAC: (2x) AK4493SEQ
  • Decoding: PCM up to 768kHz/32bit, DSD512
  • Bluetooth: v5.1 with LDAC, aptX HD and aptX LL support
  • Bluetooth Chip: Qualcomm QCC5125
  • Battery: 2000mAh, polymer lithium-ion
  • Connectivity: USB-C input
  • Weight: 5oz
  • Dimensions: 3.9" x 2.7" x 0.6"
Package Includes
  • Cayin RU9 DAC and amp
  • Leather case
  • L-shaped USB cable
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 48233428060

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4.6 ★★★★★
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K
Verified Purchase
K Hayden
Charlottesville, US
★★★★★ 5
Love it!
Size: 41 Inch Extra Long, Color: Rustic Brown
Took 3 grown men to mount but it’s been such an awesome addition to our kitchen. My wife’s coffee knook is excellent now
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 17, 2026
Z
Verified Purchase
Zenevieva
Houston, US
★★★★★ 5
Color me impressed.
Size: 41 Inch Extra Long, Color: Rustic Brown, Size: 41 Inch Extra Long, Color: Rustic Brown
My husband and I were looking for a shelf to replace the one over our coffee station. We just needed more room for travel mugs and other assorted coffee items. Most of our kitchen is done in the wood and black metal tones so when we spotted this, we were excited. We placed it in the amazon cart and purchased. Shipping took a little while but it was packaged well and nothing was damaged. It came with everything needed to build and hang the shelf including the dry wall anchors. My husband was able to put it together fairly quickly but hanging it was a two person job. The shelf isn't SUPER heavy... but someone needs to hold it while the other person levels it and mark where to mount the anchors. Once it was up, it was sturdy and looks great! We're very happy with this product. It is perfect for what we wanted to do :)
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2023
R
Verified Purchase
Rex Kramer
Battle Creek, US
★★★★★ 3
Looks decent but is slightly under engineered
Size: 41 Inch Extra Long, Color: White Faux Marble, Size: 41 Inch Extra Long, Color: White Faux Marble
Five stars for packaging, quality of materials and instructions. It's a really good looking product out of the box. No scratches or defects in workmanship. Material fit and finish is very good. If you've ever assembled anything from Ikea, the hardware will seem familiar. The problems that led to me giving it 3 stars occur in the engineering. All of the weight transfer to the center with just four corner anchor points creates a sag. If you drop a 4' level across the top after installing, it's a noticeable 1/8" dip in the middle as gravity pulls on the unsupported center. If you're one of those people that notices an out of level picture on a wall from fifty paces, this is going to be a problem for you. Being that I knew it would only get worse with time and eventually make me insane, I installed a very small L bracket in the middle under the bottom shelf, pushing the entire thing up until the deflection was gone. I also tossed the anchors that came with it as those are for concrete/block walls and used metal EZ anchors that are rated for drywall. If you use the included anchors in 1/2“ drywall, there's a good chance they'll pull out. Toggle bolts would also be a good alternative. Another small detail that's missing is the lack of a plug or cover for the four exposed cams making up the vertical center support. Depending on your viewing angle and how much stuff you'll store will determine if these are visible or not. Including a simple white decal would have been reasonable. I used some white, stick-on melamine screw covers I had lying around to try and hide the cam locks better. Lastly, I wish this were made in plain white. While the faux marble somewhat matches our dining table, The veining is too pronounced. Plain white would have been better.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 26, 2025
G
Verified Purchase
G. E. Johnson
Belleville, US
★★★★★ 5
At last the ESV Expository Commentary is complete
Format: Hardcover
Finally the ESV Expository Commentary 12 volume set is complete. This series is a great resource for those who teach or preach from any translation of the Protestant canon. This is a huge book, filled with valuable insights about Genesis, Exodus, Leviticus and Numbers. It’s essential for anyone interested in the Protestant understanding of the first four books of Torah.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 8, 2025
L
Verified Purchase
Lauren Barksdale -The Everyday Edit
Grantham, US
★★★★★ 5
Want to grow in your knowledge of the Bible? Then buy this book.
Format: Hardcover
If you wouldn’t dig into God’s word and go deep and learn more and more about the Bible, then this is your buy. It is so in depth that my goal of reading through the Bible in six months had to be pushed back because the information was so amazing and so in depth that I didn’t have time to read all each day and stay on my timeline
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 15, 2025

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