treasurepirate1
Sr. Member
- Joined
- Aug 21, 2010
- Messages
- 396
- Reaction score
- 35
- Golden Thread
- 0
- Location
- Ontario canada
- Detector(s) used
- fisher f75
- Primary Interest:
- All Treasure Hunting
- #1
Thread Owner
i went on a hunt last weekend and noticed a slight background hum from my detector (fisher f75) right when i turn the sensitivity to 88 all the way up to 99, and there's no hum when it's at 87, it doesn't seem to affect the performance because i found some great finds on that hunt. I never heard the hum before last weekend, I read similar story's on another web page with the same hum starting on 88 for multiple fisher f75s just like mine. The sound gets annoying so i'm not going past 87 sensitivity now, was the hum always there or have the electronics slightly changed over time.