Any Unknown or Unlisted Aircraft Manufacturer
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3
Troubleshooting
ATC Issue All Types
ATC Equipment / Nav Facility / Buildings; Equipment / Tooling; Procedure
While working Clearance Delivery; I was notified that Tech Ops would be working on the standby frequencies and to remain on only mains.  I made sure all frequencies were selected to main.  Over the next 10 minutes or so; several random squelches and carry over type sounds were made on my frequency.  I asked local and they said they were getting the same thing.  I notified the TRACON and they said they would look into it. After a few more minutes; one very loud noise was sent into my ear.  I immediately ripped my ear bud out of my ear and put the frequencies on loud speaker.  I called maintenance to notify them and they said they were working on the frequencies but they don't know what happened.  I notified the facility CIC as well. This is not the first time a loud squelch was sent into my ear when the frequencies were being worked on. Last time was definitely tech ops.  This time they claim it wasn't them.  I have no recommended change unless it actually was them and they don't realize it.  Then they should be more careful.  I checked the tapes to be sure it was there and recorded and it was.
SBN Controller reports of being told by Maintenance that they would be working on frequencies and to use the main transmitters and receivers; [there are a main and stand-by].  The Controller then reports of receiving a loud noise in his ear.