USB Vacuum Tube Phono DSD DAC Preamplifier with Tri-Tone Control

Part #: UTHC

Download: Drivers / Documents

Other Pictures:
Win 10 USB3.1 Gen I ROHS CEFCC


  • Support digital lossless music with DSD and PCM encoded streaming by USB input
    • DSD playback:
      • Supports sampling rate at 2.8 and 5.6MHz playback
      • Supports DSD native or DoP
    • PCM playback
      • Supports sampling rate at maximum of 384K 32-bit playback
  • Support most common digital audio format
    • Uncompress:
      • WAV, AIFF, PCM, etc
    • Lossless music:
      • WAV, FLAC, DFF, DSF, ALAC, etc
    • Lossy music:
      • MP3, OGG, WMA, AAC, etc
  • USB Digital Audio interface
    • Complies with USB2.0 High Speed (480Mbps) specification in Micro-B connection form factor
    • Backwards compatible with USB1.1 12Mbps standard
    • Support USB Audio Class v1.0 and v2.0 specification
  • High Quality 12AU7 tube amplifier provides crystal clear audio playback
  • Built-in de-pop circuitry for reduction of unpleasant popping sound during power on and off
  • Supports iPhone and Android phone with camera kit and OTG USB cable respectively
  • Audio Input:
    • Phono in: Direct input from Vinyl Record Turntable Player with MM or MC cartridge
    • USB in: Digital music stream from computer or mobile phone
    • Line in: 3.5mm stereo music input
    • AUX in: 3.5mm stereo music input
    • S/PDIF: Optical digital music input
  • Audio Output:
    • S/DIF out / PRE out
      • Shared output port for optical digital output or 3.5mm stereo output to power amplifier or active speakers
    • Bass out
      • 3.5mm stereo output with BASS enhanced
    • Stereo headphone output
      • Support 6.3 and 3.5mm stereo jack
      • Headphone driving capable for 16 - 600ohm internal impedance
  • Tri-Tone Controller:
    • Treble
      • Control Range: 3KHz-20KHz
      • Trim Range: -12dB to +12dB
      • Center Freq: 18KHz
    • Middle
      • Control Range: 200Hz-4KHz
      • Trim Range: -10dB to +10dB
      • Center Freq: 1KHz
    • Bass
      • Control Range: 20-250Hz
      • Trim Range: -14dB to +14dB
      • Center Freq: 20Hz
  • Control buttons and select switches:
    • Volume: Master volume control and On/Off switch
    • Flat: No additional gain on output sound
    • Loudness: Choose a pre-set gain on high and low frequency on low volume output
    • Pure: Bypass the sound effect control
    • Tone: Let the Treble, Middle, Bass control the output sound effect
    • Line Out: Turn On and Off the Line Out volume
  • Maximum output power bypassing Tone Control @ 1KHz:
    • 3.5mm Headphone Jack
      • Loading 16 ohm: 125mW
      • Loading 32 ohm: 118mW
    • 6.3mm Headphone Jack
      • Loading 32 ohm: 390mW
      • Loading 62 ohm: 290mW
  • Signal to Noice Ratio(SNR): around 97dB
  • Total Harmonic Distortion Ratio(THD+N): less than 0.001%
  • Stereo Crosstalk: -80dB
  • Aluminium alloy housing:
    • Housing: 93 x 87 x 32mm
    • Overall: 93 x 110 x 48mm
  • Power Supply requirement:
    • 48W 24VDC 2.0Amp
  • A perfect match with its brother product PA100D, the Class-D Power Amplifier, in the family
  • Default packaging: White box with a product sticker


  • It is a good practice that before turning on or off a power amplifier or the amplifier is being idle, the volume of the amplifier must be turned down to zero

Package Contents

  • The Amplifier itself
  • 100-240VAC to 24VDC Power Adapter
  • 3.5mm male to 3.5mm male 3-Pole stereo audio cable
  • User Manual x 1


Part Number Chipset
UTHC Savitech Bravo SA9227 + ESS ES9018K2M


All information and specification are subject to change without prior notice
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The picture/s above might differ from the actual product delivered