I received a quad of the Takatsuki 2A3 for my Woo WA33 EE monday. I have about 30 hours on them now. Even this early the Taks are the best thing I have had in this amp(EH, Sovtek, EML 2A3 Mesh, and EML 300B 2.5v, RCA 2A3 Black Plates). I am experiencing a larger soundstage with greater separation and instrument placement. I also feel a better low end response and clarity. These are really expensive but a very worthwhile upgrade. I have put my 1951 NOS RCA 2A3 Black Plates up for sale.
A big +1 for Parts ConneXion. One of the tubes was defective out of the box(not encouraging but we will see). One phone call and I had a return UPS label the next day with the replacement pair on their way to me before the defective pair was out of town. Excellent customer service!