Check out the Mapletree audio designs
http://hollowstate.netfirms.com/
Ear+ Purist Headphone amp
Its $365 assembled or $295 as a kit
I would advise to also get the Alps Pot upgrade for the volume control as well as the Black Gate Upgrade
the Alps upgrade is free currently but the blackgate would up your price by $20
http://hollowstate.netfirms.com/basicblacksmall.jpg
this version of the amp works great with low impedence headphones like the grado's and high impedence like the senn's
I would also suggest getting a Ei 12AX7 tube its a copy of the telefunken 12AX7 and is very low noise. this tube runs $12 bucks from vaccuum tube valley.
so for a little more then 400 dollars after shipping you could have a pretty sweet tube headphone amp.
hope this helps
http://hollowstate.netfirms.com/
Ear+ Purist Headphone amp
Its $365 assembled or $295 as a kit
I would advise to also get the Alps Pot upgrade for the volume control as well as the Black Gate Upgrade
the Alps upgrade is free currently but the blackgate would up your price by $20
http://hollowstate.netfirms.com/basicblacksmall.jpg
this version of the amp works great with low impedence headphones like the grado's and high impedence like the senn's
I would also suggest getting a Ei 12AX7 tube its a copy of the telefunken 12AX7 and is very low noise. this tube runs $12 bucks from vaccuum tube valley.
so for a little more then 400 dollars after shipping you could have a pretty sweet tube headphone amp.
hope this helps