Rather than asking members here about the specifics of the upgrade, just call Brent or Kevin @ VAC. They are both very helpful and up front about their work.
As far as to how they sound, sorry can't help you there.
(FYI: I love my VAC Phi 300.1 amp, and I think I have found the amp I will be using for a very long time.)
Good Luck!
As far as to how they sound, sorry can't help you there.
(FYI: I love my VAC Phi 300.1 amp, and I think I have found the amp I will be using for a very long time.)
Good Luck!