----- Original Message -----
From: "Curt Nixon" <[email protected]>
Cc: <[email protected]>
Sent: Thursday, December 16, 2010 10:59 AM
Subject: Re: [Drakelist] AC4 heat Fan Summary
All:
On both of my AC4s, from 1966ish, the cover has a series
of slots along the top and lower edge just above the top
of the chassis. These seem to provide a very even
distribution of inlet air when using the method I have
chosen. Are there AC4s that DO NOT have the slots?
As Richard describes, if the slots aren't there, the
suction cooling doesn't work. You have to have a way for
the exchange air to enter. (Or escape)
BTW, Richard is absolutely on target regarding the
consideration of heat movement. No one cares about where
the air goes we are really concerned about its effect on
the heat flow. Thermal modeling and IR thermal imaging
has provided designers today with much better analysis
tools than were available in the 60's.
Cheers
Curt
Sheesh... My AC-4 is maybe four feet away and I've
rebuilt it. It DOES have the slots. I don't know why I
pictured it with a completely solid case. All bets are off
as far as my coments on blowing rather than sucking (oh
dear) but I would put the fan so that air around the
transformer is maximized.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
