Douk Audio, Nobsound, Little Bear B4-X with Burson V5i Opamps
Amazing detail compared to the stock NE5532 originally installed in the B4-X. Would have loved to go for the V6, but then portability would have become an issue. Very satisfied with the V5i though!
Little Bear B4-X with Burson V5i Opamp
I get noise in one side and a high pitch whine in the other, so I think mine might be defective.