I wonder whether all Raytheon Registered tubes were made in Japan. Seems like they were. A NOS TS 5V4G arrived today. Rolled it along with a pair of RCA 6CY7 into the Woo; it sounded like schiit. Replaced the RCAs with Raytheon/GE 6CY7 and the difference in SQ is night and day, but still not there yet. The bottom end could use some work. TS 6CY7s are next. It's as if every time I get a new rectifier the same rolling song and dance has to be done in order to find a suitable match. Sure, it's all a part of the fun, but not being able to form a strong correlation even between the same type of tube and accompanying rectifier is driving me up a wall. Also got a single NOS Chatham 6080 for the DV. Couldn't refuse it for $9 shipped. It's burning in ATM and sounding a bit bright - an accomplishment in itself for this amplifier. It should mellow out in a day or two. Edit: Speaking of the low-end, I'd love to know how Lucasz got the Elise to dip as deep as it does with as much definition. I'm playing a Minimal Techno recording with bass extension of the godz; it's all there with the Elise. The Woo, not so much. Same goes for the DV - they both have about the same frequency-based constraint. The bass doesn't dip too deeply into the bottom octave, if at all. The DV has gobs of bass with a significant sense of weight. Not the Woo, though I'm beginning to think that it has a slight edge in articulation.