I have rolled some of my own rectifier tubs recently. It was quite a fun time and to my surprise the SQ changes quite a bit with even rectifier tubes. And there is only one tubes to change so it is a lot less work (and cost) to roll it.
Initially, I thought I like Raytheon 5U4G best due to its smooth high and rich low. Then, I re-discovered Sylvania 5U4G with DT880/600 (It was a little edgy with T1). The high is clearer but a little bit sharper and leaner.
Recently, I just got GE 5U4G and have been pleased by its sound. GE is not only clean and tonality-wise seems to be more correct (judge by flute's sound). It also seems to have very rich harmonics. The high freq is so fine and yet so smooth. Very nice! The additional plus is the low is even richer than Raytheon.
A good surprise with GE 5U4G (with very affordable price).