Help choose between two kits

[verde57]

I have a 15V trafo 30W, which of this 2 amps kit are better?
Dual 12 18V A1 Headphone Audio Power Amplifier DIY Kits Based on Beyerdynamic | eBay
DIY Kit of Class A Headphone Amp Board Pre Amp Dual AC12 15V Based on JHL Hood | eBay

 

[abraxalito]

I'd go for the second of these as they're providing a schematic and its classA. The first is more of an unknown quantity but unlikely to be fully classA. But if you love the sound of opamps, and get a thrill from rolling them, choose the first.

 

[Mayday]

The JLH/JHL has a high DC offset, if you have low impedance headphones that can be a problem.

 

[verde57]

I read something about that... what other choice's do I have to go along with the 15 volt trafo?
gonna use DT770 250ohm on it.

 

[ammel68]

I've built a couple of these and they sound quite good.
AC15V DIY Kit for Headphone Amplifier Board Reference Lehmann Circuit Design | eBay

Also, member rjm(Richard Murdey) offers a kit for his Sapphire headphone amplifier that's pretty popular.
RJM Audio - Sapphire headphone amplifier

 

[abraxalito]

I read something about that... what other choice's do I have to go along with the 15 volt trafo?
gonna use DT770 250ohm on it.

Even if an amp has a low offset it would still be prudent to use a pair of coupling caps on the output, or better still, a transformer. You don't want to lose your expensive cans from a failure of a relatively cheap headamp.