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APL HIFI DSD-GR – DSD digital-to-analog converter with tube output

10.01.2025 10:19 | ~1 minute read

APL HIFI DSD-GR is a new Pure DSD, “Galactic Reference” DAC, using a transformer-coupled tube differential Class-A output stage. The device is built on a fully balanced scheme and offers a proprietary asynchronous USB input module.

Next in the signal chain, the proprietary 64 bit PCM to DSD converter module with DSD256 and DSD512 capabilities (non oversampling NOS mode without filtering is also present). Digital-to-analog conversion is entrusted to the proprietary assembly of Pure DSD conversion module using non-magnetic resistors. APL HIFI DSD-GR is also equipped with RJ-45 input woking in balanced I2S mode.

APL HIFI DSD-GR. Image source - (c) APL HIFI
APL HIFI DSD-GR. Image source - (c) APL HIFI

The design of the APL HIFI DSD-GR uses an audiophile element base - custom Lundahl interstage and output transformers with oxygen free copper windings. Pure Class-A, differential output stage operates on the ECC99 tubes. Only non-magnetic resistors are used in the circuits of the device, op amps are not used, negative feedback is zero. Internal wiring is made of oxygen free copper cables featuring Esprit Audio cables for the critical paths. The main power supply of the model is based on an custom R-Core balanced main power transformer with OFC windings; Lundahl choke used for the tube power supply.

Specifications

This product is in the Hi-Fi and High End Electronics and Acoustics database

DACs — APL HIFI DSD-GR

  • Model name

    DSD-GR

  • Conversion type

    N/A

  • Engine

    Pure DSD Digital to Analog conversion module using non-magnetic resistors

  • DSD compatability

    Yes

  • Parameters

    up to PCM 32/384 and DSD512

  • Frequency response low +/- 3dB (Hz)

    N/A

  • Frequency response high +/- 3dB (Hz)

    N/A

  • Gain (dBu)

    N/A

  • Output Level (balanced) (V)

    N/A

  • Output Level (single-ended) (V)

    2.5

  • Input Impedance (balanced) (Ω)

    N/A

  • Input Impedance (single-ended) (Ω)

    N/A

  • Output Impedance (balanced) (Ω)

    N/A

  • Output Impedance (single-ended) (Ω)

    100

  • Analog outputs

    N/A

  • Signal to Noise Ratio (dB)

    N/A

  • Total Harmonic Distortion + Noise (% at 22 kHz)

    N/A

  • Dimensions (mm)

    450 x 120 x 380

  • Weight (kg)

    24.5

  • Official link

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