2. amps-preamps
  3. 1188786843

Power amp hum...turned off

I have an Adcom 5400 power amp (about 10 years old), that has developed a loud hum intermittently with the power switch turned off. Pushing the power switch on or pulling the wall plug will stop the hum. Recently the same hum started while turned on and playing music. Switching the power on and off again stops the hum.

I have experienced this hum with an old basement fluorescent light fixture when turned off. Turning it on or pulling the plug stopped the hum. I know these lights have transformers. Could the amp transformer be causing the same phenomenon?

Any knowledge on what's happening would be appreciated.
richrk

Showing 1 response by richrk

richrk OP
3 posts
 
Herman..thanks for your response.

The speakers do not hum. The hum is loud and seems to fill the whole house. First time it happened in the middle of the night..scared the hell out of me.

As I mentioned the hum almost sounds exactly like the turned off fluorescent fixture hum, loud and low frequency.

I do have one dimmer in the kitchen, which was turned off when the humming started.
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