Hello,
I finished building my Crack and resistance and voltages checked out great. I plugged it into my Oppo cd player and it sounds just great, but ....
Case 1) I hear hum when the pot is turned beyond 75% volume position. I don't hear this below that level. Also I hear this when no music is playing. I haven't tested the volume beyond 75%. So is this hum normal ?
Case 2) I plugged my computer audio jack into the Crack using a EPA-RCA cable and in this case I hear a hum even at low volume levels. When I remove the cable from the computer I observer behavior as in Case 1. So is this related to the cable ?
Thanks much,
A