AMB Laboratories DIY Audio

[mik000000]

I have reflowed the pot solder joints (again) with no difference.

[amb]

Is the noise present with the source connected but not playing anything? What source is it anyway?

... and the answer to these questions?

[mik000000]

yes, the noise is present with the source connected, I am using a classic ipod connected via a 6" dock cable, and the noise is present with no source connected.

[amb]

With all the info so far, there doesn't seem to be an obvious answer except perhaps you have a bad U5. It's not "dead", but one or more of its internal transistors or other component may have become noisy.

[mik000000]

thanks AMB, i will order a replacement on my next order and try that.