The only thing I know about the YBA pre is that it has a dual-mono design and that it has a decidedly solid-state presentation according to more than one reviewer. I've had the AA M3A in my system and it was killer good and dead quiet. I think the jury is still out on the idea that a tube pre/SS amp is the best combo. I think the opposite can sound just as good, and it depends on whether your Virgos like a lot of current or not. (I use a solid pre/tube monobloc set-up to really nice effect.) And if you're looking to bypass your pre, I would tread carefully, as this can result in worse sound. Fewer circuits doesn't always result in better sound IMO. Plus, you would need a volume control on your source (not your DAC) that would have a compatible output dB level so as not to overload your amp.
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