1. Before covid, the leader of my uke group taught beginners at Boulevard Music in Culver City. She asked me to play bass for the final recital. I brought my bass uke that was modified a couple months before, Eric's Guitar Shop in Van Nuys replaced the semi adjustable floating wood bridge and wonky saddle piezo pickup with a high mass fully adjustable metal bridge and neck mini humbucker pickup. He also added a battery on/off switch for the active electronics.
I get to the music store an hour before the recital, about 10am, so I could setup using the amp in the recital room. I tune up the bass and plug in, NOTHING... CRAP! I test everything, change the battery, nothing. I run downstairs and ask the owner if I can use one of the displayed bass ukes, he lets me use a Kala. Whew, got through the recital with no other issues.
As I'm driving home, I wracking my brain for what the hell went wrong with my recently modified bass, when it hit me like a ton of bricks, I forgot about the battery on/off switch, which was in the off position. I never did that again with any of my fifteen of the same model with the same mods.
2. Two weeks ago my group had one of our regular rehearsal in the backyard of a member. I brought recently purchased Phil Jones Bass Double Four Plus and my Lekato wireless pods. Got setup, tested the amp, nothing. I changed to a cable, nothing, the other bass player brought over his bass uke that he practices with when I'm the designated bass player. Nothing. Luckily, I keep an amp and mic there for open mic. That one worked fine.
I get home and test the Phil Jones, works perfectly. I have no idea what I did wrong at the rehearsal. I used it again a few days ago, and it worked.