ProtoDAC TDA1387 X8 project

[hifinet]

POPPING ISSUE UPDATE

I built a ProtoDAC using older Obligatto Copper Series 3.3uF/630V (NOS or new old stock). The first time I have used these caps other than unsoldered in the test rig. I don't remember if they popped the first time in the test rig. If they did, I probably attributed it up to the fact they were unsoldered. In this newly soldered ProtoDAC with the Obligattos, there was a loud pop at the beginning of the very first track played. This subsequently reduced to very minor tics at the beginning of many subsequent tracks. This suggests the output capacitor as the source of the pop problem. 

The worst pop is always at the beginning of the very first track in a cold system that has just been connected to RCAs. The pop was not as pronounced when the system was repowered while still remaining connected by RCAs to the preamp. 

Resistors (installed between the RCA signal lead and ground) as low as 100K did not change the loudness or character of this "cold" pop. There are tics with some track changes, all fairly minor.