2. amps-preamps
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Audible Illusion 3A humming pop noise one channel

I thought I had a ground loop problem but everthing keeps pointing back to the Pre Amp. With volume turned down you can hear a slight hum in one speaker. When that volume control is adjusted you get a click or small pop for each adjustment. Also the power box has always had a slight hum to it which I understand others have reported this also. Any ideas what it could be, and could a local tech in the Raleigh area take a look or would it need to go back to factory?
mike8622

Showing 2 responses by vicdamone

vicdamone
850 posts
 
Get in touch with AI and let us know what they suggest.
vicdamone
850 posts
 
["Sounds to me like your attenuator/volume pot may be dirty. If it can be easily accessed, some electrical cleaner/lubricant may be all it needs. Something like Caig's Pro Gold.']

Of course you're trying to help but please speak to components that you actually have a first hand knowledge of.

The AI3A uses versions of inclosed ladder resistor attenuators. Some of which have a famously short mechanical lifespan and are replaced when they become noisy.
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