BAT VK-500 protection circuit upgrade?

BAT offers a 'bias and protection circuit upgrade' for the VK-500.

Anybody have experience with this non-mandatory option?

Thanks

akaddict11-15-2005 8:02pm

levir Details Discussions Posts This discussion Message User 3 posts 02-04-2006 at 03:48am Copy Comment URL Report Comment Edit Delete I have mine upgraded. It costed me $500 + original box + shipping. I didn't hear any sonic difference.