I saw this note from Rick Beveridge on the google users group for Beveridge loudspeakers- I thoughf it would be of interest:
Aug 31, 2005, 7:28:40 PM
to beveridge-audio
There has been disagreement regarding whether the amplifier cooling
fans in the Model 2, and it's subsequent versions, about whether the
fan should be pushing air out of the amp or pushing the air into it.
I was working with my father when he worked all this out.
He intended that the fans draw cool air in from the back and push it
directly onto the tubes themselves. This heated air would rise and be
pushed out at the top along the front and sides by the air coming in
the back. It was his objective to create the thinnest possible boundry
layer of heated air around the tubes. He also reasoned that the air
from the back would bring in less dust this way.
Reversing this flow draws air in from the front and sides and then
pulls it through all parts of the amp before it is pushed out the back.
This draws the air from up high in the amp and forces it out at a lower
elevation out the back. Only a fraction of the air that the fan is
moving actually gets near the tubes which are the main source of heat.
This flow path is also contrary to the natural force of convection.
My brother Ross has experimented doing it both ways. I hope he will
describe his findings in a future post to this thread.
I am very glad to have this forum for us to share our knowledge of
these very unconventional speaker systems.
"...and the beat goes on..." Rick Beveridge
I know many users place their amps on top so this is not so important to them. I was curious about the best way to handle it though.
Rick
unread,Aug 31, 2005, 7:28:40 PM
to beveridge-audio
There has been disagreement regarding whether the amplifier cooling
fans in the Model 2, and it's subsequent versions, about whether the
fan should be pushing air out of the amp or pushing the air into it.
I was working with my father when he worked all this out.
He intended that the fans draw cool air in from the back and push it
directly onto the tubes themselves. This heated air would rise and be
pushed out at the top along the front and sides by the air coming in
the back. It was his objective to create the thinnest possible boundry
layer of heated air around the tubes. He also reasoned that the air
from the back would bring in less dust this way.
Reversing this flow draws air in from the front and sides and then
pulls it through all parts of the amp before it is pushed out the back.
This draws the air from up high in the amp and forces it out at a lower
elevation out the back. Only a fraction of the air that the fan is
moving actually gets near the tubes which are the main source of heat.
This flow path is also contrary to the natural force of convection.
My brother Ross has experimented doing it both ways. I hope he will
describe his findings in a future post to this thread.
I am very glad to have this forum for us to share our knowledge of
these very unconventional speaker systems.
"...and the beat goes on..." Rick Beveridge
I know many users place their amps on top so this is not so important to them. I was curious about the best way to handle it though.
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