Headphone amps


I like to listen to music at night - my wife likes to sleep - I can't understand why she does this with so much good music to hear. Headphones have been a blessing for maintaining peace given our somewhat different nocturnal patterns. I'm soon getting a new integrated amp without a headphone jack, so I will require a little amp for the headphones. Please provide recommendations for headphone amps that you have used and loved. I like to listen to jazz and classical at night. I'm using a FMJ 23 as a source and I tend to like tube sound. I have Sennheiser HD 600 headphones.
johnrob
I have used the Antique Sound lab DT/OTL headphone for the past year and love it. They have several options for headphones and pre-amps with headphones. Another cheaper option is the Antique Sound Lab speaker out transformer. Their website is www.divertech.com Good luck!
I'm currently looking to set up a headphones-only system and second ejliu's recommendation to check out head-fi.com. There is an amazing amount of information there on headphone amps. If you use the search function in the Amplification section, you will find many threads that discuss amps that work well with the Senn 600s.

Jeff
Sorry, I gave the wrong link in my previous post. That should be head-fi.org (not head-fi.com).

Jeff
Look at the Earmax (http://www.stoneaudio.co.uk/stoneaudio/products/details.asp?product=217) line.
Try this site. Its home to headphone lovers.

http://www4.head-fi.org/forums/forumdisplay.php?s=&daysprune=&f=20