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Amp fan cooling without dc current in the 110 line

So I just finished renovating an old TV console, modifying it by removing the TV and adding shelves to hold my gear within it. While it has vents on the sides, bottom and back, I’m sure my amp will get super hot inside. So I’d like to put a little fan in the cabinet to cool it off. But I’ve always heard those little computer fans put a lot of dirty DC current in the AC lines, resulting in noise in the amplifiers presentation.
So question is, how to avoid that. 
idahifi
willemj
1,036 posts
 
I sympathise with your desire to keep audio boxes out of sight. I have a little digital amp tucked away in a wardrobe as a bedroom amp. My Quad 606-2 sits in a well ventilated cabinet, without any problems. Anyway, I would be surprised if a fan would generate sonic problems via the electricity supply, unless your amplifier has a badly designed power supply. I would worry more about fan noise. If I can find the time I will try out some time next week, with a fan next to one of my amps (we have some spare electrical fan heaters as back up).
theo's avatar
theo
2,690 posts
 
I recently added a cooling fan to my pre-amp from active Thermal Management and it uses a wall wart. I plugged it directly into the wall which powers my system, but since the rest of my system is plugged into AC conditioners, it doesn't seem to adding any unwanted "noise" that I can hear.
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idahifi OP
100 posts
 
Hu, I've always heard fans put DC current into the electrical system. Maybe that's bunk. Does anyone know for sure
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