Howdy! I have a Mojotone 5E3 I built back in July. Never had any issues, fired up a-ok first try. Like all of my amps, I use it with a Weber Mass attenuator, and have successfully done so since building it. Today I hooked it up to the attenuator with a different speaker cable than the one I was using last week and got no sound, nothing. Switched back to the last cable I'd been using (between the main amp out and the attenuator), and it works just fine. Long story short, about half of my speaker cables don't work when placed between the 5E3 out and the attenuator, but they all work with my 8 other amps when used for the same purpose. The two that do work are slightly longer (5' and 6') than the ones that don't (2' to 4'). In addition to plugging them all in, I've also verified the speaker-to-attenuator connection, made sure it works plugging the speaker directly into the amp out, and wiggled/twisted the non-working cables around when connected to no avail. Any ideas on what's going on--maybe something super obvious I've missed, or something about the 5E3 design that would make this the case? This seems really weird.