[lifeisbeautiful]

I have a Meze classics 99, which is very efficient already. So, I don't need an amp with either my iPhone or mac.
But, I just love the sound of tube based components in home theater. (The fluid no harsh sound) Which Headphone dacs can give me the same signature?

 

[theveterans]

No DAC gives off the tube signature since DACs are supposed to have a linear frequency response. Tubes OTOH are not. You can however, insert a tube buffer such as iFi micro iTube2 between the DAC and amp (yes you will need an amp if you want tube sound) or get a tube amp such Littledot MK III or II.
 
I use a tube buffer such as the Schiit Saga myself since I like the tube sound as well.

 

[Thenewguy007]

Most of the tube based DAC's are very high priced.

 

[zacster]

  No DAC gives off the tube signature since DACs are supposed to have a linear frequency response. Tubes OTOH are not. You can however, insert a tube buffer such as iFi micro iTube2 between the DAC and amp (yes you will need an amp if you want tube sound) or get a tube amp such Littledot MK III or II.
 
I use a tube buffer such as the Schiit Saga myself since I like the tube sound as well.

Tubes can be very linear.  DHTs are probably the most linear amplification devices around, but they are generally low power.  At this very moment I have digital going into my aikido all tube pre-amp and push-pull 6B4G amp and it sounds neither tubey nor digital. 
 
I also have this tiny tube headphone amp by Oatley Electronics in Australia.  That sounds tubey.  It uses pencil tubes and actually muddies the sound.