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DACs 

 

Arkhipov Laboratories have based their range of external DAC designs more often on multibit converters such as:

  • the famous Burr-Brown/Texas Instruments series PCM63, PCM1702, PCM56
  • Philips TDA1541 and,
  • Analog Devices AD1861

  • All these devices have a well deserved reputation of being the best types in their class. They are prized by many audiophiles for their musicality, clarity of reproduction and detail resembling single-bit Sigma-Delta converters.
    The analog output sections of most of our DACs comprise a twin triode electron tubes driving toroidal output transformers having amorphous cobalt cores. DACs in our budget range employ MOSFET output stages.
    Our range of DACs can be supplied with optional external power supply blocks. Each power supply uses an electron tube rectifier (high quality 6X5) and two toroidal power transformers which feed the digital & analog sections of the units separately.
    The purchaser also has the option of including a range of contemporary asynchronous USB and Ethernet modules such as Engineered SA (ex Edel USB & Edel NMR), Bolero, WaveIO etc.

    Installation instructions Arkhipov's Laboratory DACs fitted with integrated USB/Ethernet cards


     



     
      DAC 63 (USB) & DAC 63 Dual (USB)
     
     

    DAC    

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    Our DAC63 digital to analog converter utilises the now legendary Burr-Brown PCM63P precision 20-bit digital-to-analog chip with ultra-low distortion. This chip incoporates a unique dual-DAC per channel architecture that eliminates unwanted glitches and other nonlinearities around bipolar zero. This minimises swtching effects on the analog output signal, ensures high signal to noise ratio at low levels, and achives high resolution reproduction of the audio spectrum.
    The digital portion of the DAC63 does not use over-sampling or digital filtration ensuring maximum accuracy of the output signal. The analog portion of the unit is basically the same as in earlier versions of Arkhipov Laboratories DACs.
    Our DAC63 utilises the full potentioal of the multibit converter chip without digital filtration, the advantages of which are made clear when listening to “live” musical recordings. Its sound is light and clear with excellent detail and even tonal balance.
    At the buyer's discretion, the unit can be supplied with an outboard power block. In addition to this option, the 63 unit can be adapted to work with any contemporary USB/Ethernet interface.




     



     
      DAC DSD1792
     
     

    DAC    

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    The digital to analog converter type DSD1792 is a joint project of Arkhipov Laboratories and Energy Audio. It is based on the Texas Instruments/Burr-Brown DSD1792 chip, which is a monolithic CMOS integrated circuit that includes stereo digital-to-analog converters and support circuitry. Connection to an audio system is achieved with a Bolero USB interface.
    The DSD1792 accepts PCM audio data format with sampling rates of 44.1, 48.0, 88.2, 96.0, 176.4, and 192.0 kHz of width from 16 to 24 bits (DSD – 64, 128 & 256). The design includes masterclock generators with low phase-noise (jitter) adjacent to the converter.
    The analog portion of the unit utilises step-up inter-stage coupling transformers wound on toroidal cores of amorphous cobalt. These exhibit low loss at higher frequencies and have very linear magnetic characteristics. A 6SN7 dual-triode electron tube serves as the output stage.
    The DSD1792 DAC accurately reproduces all audio formats with high resolution great detail, without sounding harsh.



     



     
      DAC 1541 (USB) & DAC 1541 Dual (USB)
     
     

    DAC    

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    DAC1541 is one of Arkhipov Laboratories older & well proven designs which was made in single and dual block forms. These units are based on the Philips TDA1541A chip including the “S1” and S2” “double crown” versions.
    Input of the digital audio signal stream is handled by high performance S/PDIF transceiver with support for 1 received channel and 1 transmitted channel.
    Analog output in the 1541 DAC is achieved in Arkhipov's traditional way: with step-up inter-stage coupling transformers wound on toroidal cores of amorphous cobalt. These exhibit low loss at higher frequencies and have very linear magnetic characteristics. A 6SN7 dual-triode electron tube serves as the output stage. In the dual block version of this unit the power supply block uses an electron tube rectifier (high quality 6X5) and two toroidal power transformers which feed the digital & analog sections of the units separately. The 1541 unit also can be adapted to work with any many USB/Ethernet interfaces.
    The DAC1541 exhibits outstanding melodic and soulful qualities with unequalled reproduction of vocals. The dual block version possesses even better sound detail.




     



     
      DAC 1702
     
     

    DAC    

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    The DAC1702 digital to analog converter is based on two 20-bit Burr-Brown PCM1702 chips.
    These devices employ a modification of Burr-Brown's well known architecture with two 19-bit matrices. This arrangement is also used by the popular PCM63 chip.
    No oversampling or digital filtering of the audio signal is used in the digital portion of this unit. The analog portion of DAC1702 is very similar to that used in the popular Arkhipov DACs type DAC63 & DAC1541, that is, toroidal step-up transformers with a 6SN7 twin-triode output tube.
    The sound produced by DAC1702 is very dynamic, clear and light, with good detail and even tonal balance – it is thus equally well suited to either sublime classical, or modern high-drive music.




     



     
      DAC 1861
     
     

    DAC    

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    DAC1861 is made using two 18-bit wide AD1861 chips from Analog Devices. Since the structure of the AD1861 chip does not include digital filtering, the manufacturer employed their own unique system of minimising output signal jitter.
    Each device provides a voltage output amplifier, DAC, serial-to-parallel register and voltage reference. The digital portion of the AD1861 is fabricated with CMOS logic elements while the analog portion of the AD1851/AD1861 is made with bipolar and MOS devices as well as thin-film resistors.
    The analog portion of Arkhipov's DAC1861 is practically identical to other popular DACs made by our laboratory such as DAC63, that is, with step-up inter-stage coupling transformers wound on toroidal cores of amorphous cobalt. These exhibit low loss at higher frequencies and have very linear magnetic characteristics. A 6SN7 dual-triode electron tube serves as the output stage.



     



     
      DAC 56
     
     

    DAC    

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    The DAC56 was a popular, budget-priced digital to analog converter made by Arkhipov Laboratories over an extended period and had been discontinued. In 2016 the design was remodelled and put into production again. Improvements included a new cabinet, new printed circuit board with higher grade components and a new 24-bit stereo digital audio receiver by Asahi Kasei, the AK4113VF.
    DAC56 is designed as an external converter of digital audio streams to connect via S/PDIF to USB-S/PDIF converters, media players or CD transports.
    At the heart of the design is the Burr-Brown PCM56 chip – a fully monotonic, digital-to-analog converter that is designed and specified for digital audio applications.
    Our DAC56 does not use oversampling or digital filtering of the audio signal. Output frequencies above 20kHz are minimised by a C/L/R filter system.
    The analog output section of the unit is served by a single stage, highly linear differential amplifier using FETs running in Class A. There are no coupling capacitors in the audio signal path while the rest of the design includes film and mica capacitors. All power rails to integrated circuits are decoupled by L/C filtering.
    The unit possesses a soft analog sound, with a full rich mid-frequencies, transparent highs and a broad stereo image.




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