F75 humming in Disc mode?

Hey, Ive had my F75 for about a month now and finally started to bump things up a little .. Even after a factory reset when i bump the sens up to or past 88 in disk mode i get this slight humming sound.. is this normal? Its not that erratic EMI sound, i know what that sounds like

If i jump over to all metal mode and switch from stat to motion mode and switch back over in disk mode the humming is gone. I can bump the sens up over 88 and all is silent... Hmmmmm?

Oh.... and yes the detector ID's targets and gets good depth,

Mine does that too, but not all of the time. It seems like it's more likely when the ground is above 85 GB or if I'm near power lines.

My F75 hums with the small elliptical concentric coil but chirps with either of the DD coils.

I actually like the hum background rather than the chirping.

Robby,

Your numbers and observation are exactly correct. When you are in the ID mode and you raise Sens to '88' specifically...... and hear a 'hum'; this means that your All-Metal mode was left in 'Stat'.
Simply flip over to the All-Metal mode and select 'motion'. Now flip over to the ID mode..... and your 'hum' problem is gone.

Thanks for the replies. Good to know the detector is acting normal

Yes, I duplicated the same thing with my F75. If fact, it occurs at any SENS setting 88 or higher.

Is this done by design for any particular reason?

........was not intentional; however, this should tell you something about Sens settings at '88' or above.