This AD30's AC filament lines are connected using little plastic tabs and a bunch of hot glue. Nothing says "I'm confident in my manufacturing process" like tons of glue just slathered everywhere. Jamie had a show in a week and half of her tubes refused to come up. I found the offending connector and hardwired the lines to the PCB (no glue needed!) If it hadn't been an emergency situation I may have just hardwired them all for good measure.