Actually it is the best headphone I have on a pillow. It is so comfortable and the music is so nice that I fall asleep within 2 classical tracks (not to mention I can't hear my wife nagging). 

I suspect this is the case but just wanted to be sure. Thanks!

I've been sourcing for a backup 5998 for my WA2 now because after rolling various tubes, it seems to be what I like.    I got an offer for 5998 and 5998 CTL but the CTL costs more. Besides that, I assumed CTL is an earlier batch in production.   Is there any difference in sound?   Maybe...

  I drove my Momentum for a long while from my iPhone and always thought the music is already so good. One day, I purchased a nice portable dac/amp and discovered a totally different world on my Momentum. Then the long journey of headphone + dac + amp search continues....

Thanks guys - that was helpful!

Haha hodgjy, you're just trying to tease me by saying ^.   I have the Tungsram EZ80 which sounds pretty decent - but it's the 'what I am missing' feeling that impulses me to try the RFT out.    Hopefully I can get a decently priced one out of ebay. Thanks for the help everyone.

  Great - sounds like what I would like.   I ordered a pair of the Philips ECC88 and it would be interesting to compare against my current Siemens and friend's Bugleboy.

By any chance, do you all know of any place where the RFT EZ80 is in stock? I'm thinking of testing it out with the current EZ80 tubes I have.   I went through like a couple of websites, and it seem to be selling really fast. There was one seller which I delayed purchase confirmation for 2...

  I'm using a pair of Siemens E88CC and it is a lot better than the stock tubes. Getting hold of a pair of bugle boys tubes from a friend of mine and hoping to see how it flair against the Siemens. Tube rolling is really a tiring but rewarding activity.     How well do you like the Philips ECC88?