O_o ...we must be hearing things differently & also seems to be the matter of taste.
Imho Ultron PCC189 is definitely better than Philips PCC189. And same or little better than Amperex GAC, depending on music. For example, Amperex GAC is too mellow & warm with Dead Letter Circus / TOOL / Karnivool and lacks littlebit in bass/percussion tightness & kick - Ultron PCC189 "fixes" all that. Like I said already, both have same soundstage imaging but Ultron is much better layered and transparent with instrument separation also being lot better. Same goes against Philips PCC189.
Well, anyway, nice to hear someones else opinion. For me it`s very very good tube, and for the price I`m getting them - killer tube!
Edited by CoiL - 4/8/13 at 9:09am