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cooling fan for receiver question
- Thread starter johnp66
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In theory placing the fan under the amp/receiver makes the best use of convection current, that's what I did.
http://www.audiokarma.org/forums/showthread.php?t=608556
In practice I think that because there is usually a circuit board mounted horizontally across the middle of the amp interior the airflow gets blocked and diffused, reducing the effectiveness. Others have reported much better (measured) results by placing the fan above the amp and blowing down into the chassis. I'm guessing that this works because you are getting airflow more directly onto the component and heat sink areas.
In any case I'd recommend buying clip on filters to reduce the amount of dust being blown into the chassis. The larger the fan dia. the slower it can turn for a given airflow, and the quieter it will be for a given airflow. I just bought a KazeMaster II PC fan controller that I'll be adding to my setup when I have off during the holiday break. I'm not sure if the temp alarm function will be useful or not, (the temp range is selectable from 55° - 90°c) but it can't hurt.
Cheers,
James
http://www.audiokarma.org/forums/showthread.php?t=608556
In practice I think that because there is usually a circuit board mounted horizontally across the middle of the amp interior the airflow gets blocked and diffused, reducing the effectiveness. Others have reported much better (measured) results by placing the fan above the amp and blowing down into the chassis. I'm guessing that this works because you are getting airflow more directly onto the component and heat sink areas.
In any case I'd recommend buying clip on filters to reduce the amount of dust being blown into the chassis. The larger the fan dia. the slower it can turn for a given airflow, and the quieter it will be for a given airflow. I just bought a KazeMaster II PC fan controller that I'll be adding to my setup when I have off during the holiday break. I'm not sure if the temp alarm function will be useful or not, (the temp range is selectable from 55° - 90°c) but it can't hurt.
Cheers,
James
I get those laptop coolers used with two fans. Crack it open and remove them. Then a couple of wall wort's @ around 6V DC and wire them up rap with tape. Plug in into a switch outlet on the equipment. Place the fan so the air is moved out of the top not in. I also put stick on rubber feet onto the bottoms.
Not much a couple of bucks maybe.
Barney
Not much a couple of bucks maybe.
Barney
Imho, any time that you use a fan as an exaust (ie underpressure) you will be constantly pulling dust into every opening in the chassis. Using a fan to push air into the case (overpressure) may not be as absolutely effective, but you can filter the air and the overpressure helps keep dust from entering the case.
Cheers,
James
Cheers,
James
Capt Odyssea
In Yamalibrium
I did do the double muffin fans (5-6"?) in a cut out at the back of the cabinet,
12" x 20" AC filter, 2 x 12v fans @ 9 v, quiet and putting positive pressure into the cabinet with outflow around the door has kept the equipment remarkably dust free.
I've changed the filter once, as I did a slide in/out with alum from the top/back.
Mx1000u and RX1100u, DSP-1 so I do feel warmth coming out nicely.
Comes on with the receiver switched power outlet.
12" x 20" AC filter, 2 x 12v fans @ 9 v, quiet and putting positive pressure into the cabinet with outflow around the door has kept the equipment remarkably dust free.
I've changed the filter once, as I did a slide in/out with alum from the top/back.
Mx1000u and RX1100u, DSP-1 so I do feel warmth coming out nicely.
Comes on with the receiver switched power outlet.
markn2wae
Mark T N2WAE
Here is what I do with my Sansui 1000A receiver.
I bolted one small and one slightly larger 12 Volt computer fans to the back of the perforated cover of my Sansui 1000A tube receiver.
The slightly larger fan cools two of the output tubes AND the power resisters at the left rear, the slightly smaller fan cools the other two output tubes (both fans blowing OUT).
I don't have a real problem with too much dust, so cooling air from the room is drawn into the body of the receiver (why blow HOT air INTO the set?)
This way, the HOTTEST air gets exhausted first, followed by cooler air.
The fans are powered by a simple 4 diode bridge module, followed by a capacitor, this gives me about 8.8 Volta DC output from the 6.3 Volts provided by the heater circuit for the output tubes (the wiring for the fans is totally floating,NOTHING is connected to ground\chassis).
Then I have a "wall wart" powered fan under and to one side from the overhead shelf pushing air across the back and top of the receiver, works like a champ! :thmbsp:
Mark T.
I bolted one small and one slightly larger 12 Volt computer fans to the back of the perforated cover of my Sansui 1000A tube receiver.
The slightly larger fan cools two of the output tubes AND the power resisters at the left rear, the slightly smaller fan cools the other two output tubes (both fans blowing OUT).
I don't have a real problem with too much dust, so cooling air from the room is drawn into the body of the receiver (why blow HOT air INTO the set?)
This way, the HOTTEST air gets exhausted first, followed by cooler air.
The fans are powered by a simple 4 diode bridge module, followed by a capacitor, this gives me about 8.8 Volta DC output from the 6.3 Volts provided by the heater circuit for the output tubes (the wiring for the fans is totally floating,NOTHING is connected to ground\chassis).
Then I have a "wall wart" powered fan under and to one side from the overhead shelf pushing air across the back and top of the receiver, works like a champ! :thmbsp:
Mark T.