For a very short period we have a limited quantity of GOLD Bybee Purifiers.
I modded one SB2 last week with the Gold Bybees. In our listening session this weekend, while it still needed some more break-in, the Gold Purifier had a more "natural, analog" high end compared to the Silver Bybee.
There was a slight fullness to the sound. The Gold Bybee purifiers will be available at $500.00 a pair installed in a modded SB.