DAC using tubes in conjunction with a neural network in the digital stage

invalidinvalid Posts: 353
Space tech labs has a dac using tubes for upsampling, not just in the output stage. It has a neural network and tubes to do the upsampling. He claims it eliminates over 1000 transistors to give it an analog sound. Has anyone here know of any other dac that uses this technology?

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  • invalidinvalid Posts: 353
    I would post a link to the site, but I don't know how to do it on this forum.
  • BlueFoxBlueFox Posts: 13,942
    invalid wrote: »
    Space tech labs has a dac using tubes for upsampling, not just in the output stage. It has a neural network and tubes to do the upsampling. He claims it eliminates over 1000 transistors to give it an analog sound. Has anyone here know of any other dac that uses this technology?

    Tubes eliminate “over 1000 transistors”? LOL. I don’t think so.
    Bud - Silicon Valley

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  • invalidinvalid Posts: 353
    Space tech labs feedback page on audio canuck has a lot of positive comments about his face bettering a lot off other high end dacs.
  • invalidinvalid Posts: 353
    Spell check put face instead of dac.
  • mhardy6647mhardy6647 Posts: 26,591
    invalid wrote: »
    I would post a link to the site, but I don't know how to do it on this forum.
    BlueFox wrote: »
    invalid wrote: »
    Space tech labs has a dac using tubes for upsampling, not just in the output stage. It has a neural network and tubes to do the upsampling. He claims it eliminates over 1000 transistors to give it an analog sound. Has anyone here know of any other dac that uses this technology?

    Tubes eliminate “over 1000 transistors”? LOL. I don’t think so.

    Indeed. One triode tube, like one transistor, can be one logic element.
    A typical modern large-scale integrated circuit contains millions or more transistors. A quad core i5 or i7 CPU contains about 2 billion transistors. Admittedly, a DAC chip probably contains less, but still a whole bunch to do its job.

    Read about the Vacuum Tube Supercomputer here ;)
    http://www.ominous-valve.com/vtsc.html
    invalid wrote: »
    I would post a link to the site, but I don't know how to do it on this forum.

    umm... cut and paste.
    http://www.space-tech-lab.com/DA_Converters_USB-DACs/DAC.php
  • invalidinvalid Posts: 353
    You seem very knowledgeable about digital, thanks for the info and posting the link I failed to post.
  • mhardy6647mhardy6647 Posts: 26,591
    So, I don't see any claims about what the tubes (except the rectifier) in the DAC are doing... what am I missing here?
  • OleBootOleBoot Posts: 727
    mhardy6647 wrote: »
    So, I don't see any claims about what the tubes (except the rectifier) in the DAC are doing... what am I missing here?

    I too looked at the site and I he refers to a tube output stage and a tube buffer in the descriptions of the different dacs, BUT here's the big one for the most expensive DAC:

    With our powerful 8x TUBE up-sampling processing unit (much better than solid-state or FPGA up-sampling circuit, which can eliminate at least 1000 transistors, sound quality even better than most of vinyl analog playback ) in this DAC, regular CD quality 44.1Khz input can automatically up-sample to 352.8Khz, if use higher resolution files such as 96Khz or 192Khz, they will up-sample to 768Khz or 1,536Khz resolution. The process is carry by an array of tubes, which perform real-time update for every single sampling delay, a recursive infinite taps butterfly summing unit (originally used in neural networks, functionally equivalent to but with even better sonic performance than use million taps FPGA up-sampling filter processing) will adds up each mulitipliers result and feed to the next coefficient for next sample processing.

    DSD64 input will be 8x up-sampled to DSD512, and DSD128, DSD256, DSD512 input will up-sample to DSD1024 quality.

    Combined with our special designed 16 triode tube section, easily convert the digital sound into analoge alike high-end vinyl MC cartridge playback quality, but with even better micro and macro dynamics with super low noise floor


    https://www.space-tech-lab.com/DA_Converters_USB-DACs/DA-DSD1024-X8 TUBE.php

    Have'nt looked at many DACS that use tubes, but never heard of such a thing.


    As for a neural network, it plays chess, does the NYT crossword and sings Daisy, Daisy.
  • mhardy6647mhardy6647 Posts: 26,591
    edited May 24
    Well done @OleBoot !
    I will admit, I didn't look at the most expensive one. Silly me! :)
  • KennethSwaugerKennethSwauger Moderator Posts: 7,323
    The Schumann Resonator is certainly an interesting device.
    "They thought we were too loud, but shoot, I had four army blankets folded over my amp, and the volume level was on 2. I'm used to playin' on 10!" S.R.V.
  • invalidinvalid Posts: 353
    The most expensive one is actually over 20,000, it's a 3 chassis dac
  • invalidinvalid Posts: 353
    I can't find any negative user reviews of space tech labs dacs. only positive user reviews of which there are quite a few for a small company.
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