I've checked out the BAT web site and can find no mention of a VK51SE upgrade. That said the plain jane VK50SE looks like one of the best pre-amps out there. I am very curious about how it stacks up against the Sonic Frontiers Line 3. One place where it appears to have an edge is with the resistive volume control. The Line 3 looks to have the superior power supply. Any comments?
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