I don't know, but it seems to work pretty well. If one could find any fault with this player/dac, I could say it is a tad dark. The Signature mods help address this somewhat however. I think a Sistrum Apprentice stand will also help and I have one on the way soon.
Try changing tubes if a bit dark. I am very well pleased with the 'profile' of sonics. A bit less dark and tubby now with a bit of sparkle on top. Just right for my system now with different tubes.
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