Just a quick review.
For the people that will be having a set of my adaptors, the tubes i recommend to use first are the Tungsram E80CC
They are my favourites of all the tubes i've tried so far, and can be found quite cheap for a pair on ebay, although there aren't many pairs available at the moment.
The sound seems very neutral, bass and mids are in good proportion, if anything i would say the mids have slightly more presence than the bass, treble is lovely and smooth and airy.
Soundstage isn't their strongest point, but it doesn't let them down, seems to have just the right amount of space, deffinitely not closed in.
They are not ultra detailed, i find myself switching back and forth between my D1 and my Lyr with these tubes in to compare them, D1 seems very precise and cold sounding, these tubes present a slight fuzzyness, like a kind of lazyness to the sound, they are still a detailed tube, but softly so, quite hard to describe. I think this is due to running them out of spec, they are described as ultra detailed by many people that have used them, but they aren't using them in the same way that we are.
They are a very quiet tube, zero microphonics, that is probably thanks to the individually boxed anodes that is a characteristic of this family of tubes. I can only hear a low humming sound when i plug really sensitive headphones into my Lyr (Yes i had a mad moment and plugged in the UM Miracles) But anything else that requires a good amount of juice (Planars, etc) it is a pitch black, quiet background.
I think for the price, this is one that is well worth having in the collection.
Disclaimer: DO NOT plug E80CC straight into your Lyr, they are NOT pin compatible and need an adaptor (pictured) to make them work.