Argh, this is the never-ending problem apparently! After hours of consistently excellent playback, this morning after another “pop†I lost all audio from the left channel. The small 12AU7 tube stayed illuminated completely, leading me to believe this is an LED problem. Based on an earlier comment from you, Paul, and some searching around, I suspect I’ll need to remove that A3 LED and jumper A3 and A8 with a wire. Super newbie question incoming, but does it matter which color wire that came with the kit I use, or are they all created equal? Thanks!