Burson Single v6 Vivids on an 80s Adcom GFP-555 preamp. Preamp totally rewired with silver signal wire, new electrolytic caps, new film output caps, with the wonderful finishing touch of Burson v6. A lot of DIYers tend to modify these early Adcom Preamps, more should try v6 singles with them. Much wider soundstage, details, air, and lower frequencies presented with authority. A drastic change for the better from the stock Adcom branded chips. Well done Burson!