electricguy61
Senior Member
Got called to a multi-million dollar home (that's not really saying much in the Bay Area).
There was an electrical hum in the master bedroom, such that the owner couldn't sleep in the room for the last 6 weeks.
1 general contractor, 2 electricians, one handy-man, and one "astrophysicist" friend had all tried to find the problem, but were unsuccessful.
We traced the noise with a telephone tracing amplifier tool and a stethoscope. The owner had thought it was coming from the wall behind the bed, but we could actually hear it in the floor, as well as in the kitchen ceiling below.
Shut off all power to the house, noise still present.
With all power off in house (amazing how much noise is present from electrical devices), did more tracing with the stethoscope.
The sound was seemed to be the loudest on the massive, wooden bedframe.
Dug out the bed linens, and found a Bulova watch, the one know for the "tuning fork" for accuracy. The watch back was flat against the backboard, and the "tuning fork" in the watching was vibrating against the wood, resonating through the bedframe, much like a piano resonates when the keys are struck, causing the hum.
Took 2 journeyman and an apprentice 2 hours to find. Customer said it was the best $500 she ever spent. She promised us a good write up in "Yelp".:thumbsup:
There was an electrical hum in the master bedroom, such that the owner couldn't sleep in the room for the last 6 weeks.
1 general contractor, 2 electricians, one handy-man, and one "astrophysicist" friend had all tried to find the problem, but were unsuccessful.
We traced the noise with a telephone tracing amplifier tool and a stethoscope. The owner had thought it was coming from the wall behind the bed, but we could actually hear it in the floor, as well as in the kitchen ceiling below.
Shut off all power to the house, noise still present.
With all power off in house (amazing how much noise is present from electrical devices), did more tracing with the stethoscope.
The sound was seemed to be the loudest on the massive, wooden bedframe.
Dug out the bed linens, and found a Bulova watch, the one know for the "tuning fork" for accuracy. The watch back was flat against the backboard, and the "tuning fork" in the watching was vibrating against the wood, resonating through the bedframe, much like a piano resonates when the keys are struck, causing the hum.
Took 2 journeyman and an apprentice 2 hours to find. Customer said it was the best $500 she ever spent. She promised us a good write up in "Yelp".:thumbsup: