ok, thanks for the answer

http://www.ebay.de/itm/1PC-OPA2107AP-OPA2107-Dual-Low-Noise-OPAMP-DIP8-NEW-/130809723527?pt=AU_B_I_Electrical_Test_Equipment&hash=item1e74ddfa87   And this is the correct OPA2107, right?

thanks   are there any links which proper tool to be used?

or is it that easy?   pull out the old opamp, plugin the new one?   no soldering?

Thanks   Yesterday I ordered one Little Dot 1+ to get started with my Grado.   Nevertheless the Vioectric HPA 200 is also on my wishlist.   Regarding the LD1+ I have now read that many people made some opamp rolling (besides the tube rolling)   Is there any detailed description...

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Hi,   I have a Hiface here with AMD 760G chipset board, running on Windows 7 Prof. SP1 64 bit.    Unfortunally I have the same problem as many others had when connecting the Hiface to the USB port. The Audioplayer (jriver, foobar) freezes, audio controll freezes, etc.   I read some...