OK..I added the AC4 pix to the Drake fan install photo album I have on
Picassa:
The pix of the AC4 show an older AC4 that I havent yet changed over to
the Silenx fans. They are amazingly quiet and are available in several
different sizes, colors, and air flows.
I now use the Silenx on my TR7 and its PS, Tr4, Tr3, R4/T4 AC4 and a few
other places. I need to change them all over inside my PC's also cuz
now the computers are the loudest fans in the shack!
These are all the 80mm models but they also make 120mm styles that are
awesome as well and just as quiet.
I will add the R4 fan install and baffle pix to the collection soon. It
makes a HUGE difference in the heat getting to the power transformer and
right side panel of the Rx from the audio tube---along the way, keeps
the start-up VFO drift to a much lower value.
http://picasaweb.google.com/captcurt08/DrakeFanInstall#
[email protected] wrote:
Curt,
I would love a photo or two of how you cooled your AC-4.
Also, My L-4B PS runs super hot and I need to do soething with it too.
73
Lee
-----Original Message-----
From: Curt Nixon <[email protected]>
To: Dick KF4NS <[email protected]>
Cc: drake <[email protected]>; DrakeRadio list
<[email protected]>; Drake list at zerobeat
<[email protected]>
Sent: Mon, Dec 13, 2010 7:05 pm
Subject: Re: [Drakelist] AC4 heat
Generally, transformers can and do run hot enough that you can't leave
your hand on them for very long. They will be fine like
this..but...heat does deteriorate plastics and varnishes like that used
inside. Electrolytic caps also have reduced lifetimes depending on
heat. So I have elected to add a silenx super quiet fan to my AC4. I
drilled a series of holes in a pattern to match the 80mm fan. The fan
is mounted on one end of the long side of the aluminum cover. It has
holes along the sides to allow air IN so the fan draws air OUT. If you
want to see pictures of this, I can take a few.
I agonized over doing this to the cover but have no regrets at this
point...The PS runs cool enough that it is hard to tell it is on. It
still fits inside the MS4 if required, and is dead quiet. These silenx
fans are about 7.00 bucks.
I added similar fan to the PS for my TR7 as well. Many commercial power
supplies use fans for continuous operation even though the transformers
are rated to run at elevated temperatures.
FWIW
Curt
KU8L
Dick KF4NS wrote:
A while back I recall a discussion about the heat in the AC4/AC4R.
Now
that my rig is back in the shelf along with the PS in the MS-4, I
notice that the back of the AC4R is too hot to touch for more than a
couple seconds. I worry about cooking the xfmr too much.
I could put a fan on the rear apron, and if so, is there a preference
on the location? Also, would it make any difference which direction
the air flow goes?
73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!
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