Here;s a good one for ya! My beloved Crate BT-350 head took a dump last week. I thought it was beyond repair, and the local Crate repair guy told me he had a 2 month backlog, and if it wasn't working, it probably wasn't worth fixing. I had no cash, no credit, and was looking at having to return all my childrens Christmas gifts so i can buy a new amp. But he told me what to do. Turns out there is a fuse inside. If you replace it, and the amp works, you're ok. If you replace it and Amp still doesn't work, or worse yet, it catches fire, you're f*cked. "Either way", he said," you know whether you need us or not!" So, I replaced the fuse, then noticed a nut from the power supplt was touching two transistors. Remove nut, replaced fuse, and Voila! Lights, camera Action!!!! I still think I need a new amp, but at least I can wait till I can afford it!!