Hi all,
I know, that is old, everybody is playing now with B3, I still like my B1, but...
I got a short (a third of the second) annoying noise at the beginning of the track. The same is after the "pause".
The lock led is steady, no blinks.

I have used Visual Analyser software from SillanumSoft and the test record with plain sinus signal to capture some graphs.
First, residual signal, just the background (Dell E4300):


Now the normal sinus signal:


And now - the beginning of this track:


And the other picture (lower freq of test signal)


And a board:


Any hints ?

I/V is used, I got a circuit based on Pass D1, balanced. To capture it I've used single ended (one half).