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Of course it is bad, whether it`s humming or not.
Before you spend that kind of money, try the simple things first. If the transformer housing is bolted together and/or bolted to the chassis of the amp, tighten all the bolts. Even if there are no bolts visible, do some experimenting with a strong clamp: With the amp turned on and the transformer humming away, go around the transformer housing and apply the clamp to it, carefully, in various places and in various directions. You may find a place where putting the squeeze on it either stops or reduces the hum. One other thought: A humming transformer can be an overloaded one. If the transformer gets extremely hot after the amp operates for a while, and especially if smoke ever comes out of the amp, then the humming is a definite clue that there is a problem, but the problem is not the transformer.
Turn it off.
Replaced capacitors that are no lomger capacitors.
Turn it off...
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Unplug it.
because she doesnt have a cute humming bird like we do
stop hunters first ,then stop people who make roads in the woods
If the furnace itself is in the attic, the humming is likely caused by electrical components in the furnace--most likely, the blower motor, or else a transformer or relay coil. If the furnace is located elsewhere, the humming may be caused by a damper motor or possibly the air movement itself vibrating a damper or some sheet metal.The HVAC Veteran
it's the transformer. that you here. humming. if too noisy you can replace it. and that should solve your problem. its just some are not built right and they tend to hum.
One of the things to do is if your ceiling fan is being operated by a dimmer, set the dimmer to the highest setting to stop it from humming or replace the dimmer switch with a regular wall switch.