Extended Chimney
I tried and I found another tricky solution to help better heat transfer using already available method inside the amp. No help to make the room colder of course
I put a cartoon chimney on top of amp:
After turning the amp, 45 minutes later, the amp was not as hot as before. Both the top and especialy bottom part was colder. When I put my hand in the opening under the amplifier betwen amp and table to control the temperature of bottom part, I noticed air flow and I felt coldness on my fingers suddenly. I can say this was effective as %20-25 on top and %45-50 on the bottom.
Then I removed the cartoon box chimney:
After 10 minutes the amp was warmer and one screw on the bottom part was only touchable for half a second only and I just hit my elbow to wall when tip of my finger got burned. Touching to that never took 1 minutes. I tested how air flow changes under the amp, putting the chimney and removing it continuously. Yes chimney helps better air flow, this is noticable.
Then I put the chimney again:
It took 15-20 minutes for the amp to get colder. It takes 3-4 seconds now for me to test that burning screw under the amp without geting burned but it is not dangerous now. Bottom part is like seaside on the beach with continuous wind.
chimney is the cartoon shipment box of a radiator. It is 38 x 17 x 67 cm.
I will test again tomorrow but this is effective. I dont want to remove it while listening now. A widescreen tv prevents it from being seen on a table constructed having a chimney especially when amp is in lower shelf in a multishelf table. Almost hidden chimney.
This may be due to the specific room conditions too.
A dangerous try!! with any possible sideeffects, but works.
http://en.wikipedia.org/wiki/Chimney
so this chimney causes according to the formula approximately a 0.02 cubicmeter/second air flow, and this equals to 72 cubicmeter/hour airflow. Ti=35, Te=30, C=0.65
when I look at the link below, I saw that this pc fan causes 76.2 cubicmeter/hour air flow ! almost equal
http://www.pc-fan.pl/product_info.php/products_id/231?osCsid=51cce005cb616c0e4772c037eb5b0b91
or these:
http://www.svc.com/af12025l.html
http://www.quietpcusa.com/Noctua-He...ized-92mm-Fan-CPU-Cooler-NH-U9F--P135C35.aspx
am I right?? If so this is effective without any noise and interference.
EDIT: In a 3 floor building including roof, if you have a ready chimney of a stove,oven etc, constructing a pipe from closed system rack to that, you get 4 pc fan with the danger of soot and smoke on to the system. Or simply you can put the system into your unused, really unused fireplace of whole building, some valve units or decorative pentods with vfets would look good

But a decorative chimney-rack in front of the wall with wide TV gives practical 2 pc fan preventing noise, interference, replacement of fans every year.
mesut