[kramer5150]

Curious... could I use a pair of these kits in a single ended, output transformer coupled rig for my power hungry K701?
I am more familiar with OP amp DIY, so any general feedback / commentary is appreciated.   Google searching the [size=small]TDA2003 brings up several discussions and positive commentary on its use as a headphone amp.[/size]
 
Some excellent user reviews on the parts-express site... but nothing regarding its use at ~65 ohms.
http://www.parts-express.com/pe/showdetl.cfm?partnumber=320-214
 
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=K4001
 

 

[nikongod]

I have not tried the amp kit you mentioned, but here is some experience/things to watch out for from other low power speaker amps I have built for headphones. 
Noise levels may not be as good as you had hoped for/are used to. 
Gain may not go low enough. 
 
That being said, I would certainly try it. They look like they will be fun for not an insane amount of money. 
If they reallllly suck for headphones you could probably make a guitar amp out of them