Hey guys, this is a crosspost from diyAudio, was wondering if you guys had anything to add recently have started making an o2 amp. While checking through all voltages on the board, using NwAvGuy's troubleshooting guide. I noticed that the DC offset at P2 measured 36 mV and 16 mV, which is a lot higher than it should be. According to NwAvGuy, it should be less than 8 mV. I measured the voltage at the op amps but again it was the same values and swapped around, they presented the same value, so I don't think it's the op amps. The values seemed to change a bit, especially battery power vs AC power. I checked all the solder connections under the DIP sockets at U3/U4, reheated them to check for cold joints, and the resistors R12 and R13 both measure 37k ohm. I then checked pins 1 and 7 on U1 as according to this post http://www.diyaudio.com/forums/head...eadphone-amp-diy-project-378.html#post3806667 and the voltages came up fine. I'm wondering what I should check at this point or fix, or whether 16 and 36 mV is fine? I plugged in some beater earphones and when turning on the amp, there is an immediate loud click. It seems to play music, but I got an odd issue where there would be repeated loud clicks. I haven't been able to reproduce this specific case.