I`ve been burining in my Ultron PCC189 quite a while now and after listening following music...
TOOL - Lateralus FLAC
TOOL - 10000 Days FLAC
Karnivool - Sound Awake FLAC
Dead Letter Circus - This is The Warning FLAC
Tesseract - One 320kbps
...and switching between Amperex GAC, I´ve come to conclusion that Ultron PCC189 is better for rock/metal/progressive music.
Ultron PCC189 has tighter, punchier and more accurate bass/percussion, more transparent and better layered soundstage with littlebit more air, better instrument separation. Mids and vocals are also great! I`m thinking stocking up on Ultron PCC189 rather than chasing any more tubes. JJ E88CC + Amperex A-frame orange will be my last two "new" tubes. After that I`m done, period.
Miniwatt-Dario PCC189 is still my best tube for every genre and JAN Sylvania 6922 for electonic music.
Edited by CoiL - 3/29/13 at 1:22pm