Custom Tube DAC

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I just bought a tube DAC that I have very limited information on. The ony thing that I know for sure is that it has the following IC chips in it:

CS4328-KP 18-Bit-Delta-Sigma stereo DAC
CS8412-CP

It has a single 6DJ8 tube. Is there any way to gleen more information about what the specs might be on this custom tube DAC? Like is it over-sampling/non-over-sampling, upsampling/non-upsampling, etc?

It has a single digital coax input and a single pair of RCA output.

Thanks,
Mike
 
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