I've been listening to the 5755 in Ember with my GH1s (with Grado G-cush pads) now for about an hour or so. I use Jeremy's attenuator adapter cable, so keep that in mind. Gives me a lot more play on the volume dial. Also kills most of the background noise and hiss without having to resort to digital attenuation. I'm sitting at about 11 o'clock on the volume dial right now listening to some Animals as Leaders. Starcastle was a bit over 12 o'clock.
I'm quite satisfied with this tube so far. Definitely a brighter presentation than the 6J5Gs, but not overly so. I guess anything is bright compared to them, though. Same as in the Leeloo, I don't find any obvious shortcomings and nothing stands out as missing with the 5755, but that's a good thing. I unfortunately tend to zero in on annoyances in tubes, and I don't have any with this tube. Same with the 5670, just an all-around good sounding tube. This tube seems to have excellent control over the entire audio range and makes me want to keep on listening. Really nice sound for prog rock and metal.
Can't say anyone should just run out and buy 5 of them and an adapter, but if you're looking for a cheap, solid tube, it's worth checking out. Harder and harder to find good NOS tubes that don't cost a fortune. I was originally turned onto this tube from Justin, owner of Ampsandsound, while talking to him at a local meet in Phoenix, as his recommendation for the Leeloo. Figured it would work well in the Ember also, and certainly does seem to. Just don't forget you need an adapter to try it out... Don't want any fireworks.
