I am using a Paradisea dac with stock tube. SB with upgraded transformer. The Paradisea brings a musicality that the SB dac does not have, which could be attributed to the tube. On the other hand it does lack some detail, which is more an error of omission, and not missed due to it's musicality. How it sounds in your system will depend on associated components, but I'd definitely recommend upgrading the SB power supply first.
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