My '78 P-bass, I plugged in today, and it was dead. Played about twelve hours prior and it worked fine, no battery, no nothing. I checked cables, amp, and I swore up and down it wasn't my bass. Guess what, it was. I pulled the thing apart, the leads soldered to the pickup came undone. Darn that acidic solder, it had to fail me when I really wanted to play. So I soldered the things back together, good as new, but there goes the collector value. Not like it had much, all original except for the wire between the two pickup halves. It's red now because that's the only cable I had. Even with a passive bass, this is why I'll bring a backup.