[R-390] R390 cooling fan

[Dan Merz]

Brad,  I used a 92 mm size fan with 35 cfm at the rated voltage.  I ran it
at half the rated voltage,  so the flow was less.  I recommend  Mouser Orion
fan because it worked for me,  others would work I'm sure.  I think Roy used
the 80 mm size with flow probably around 30 cfm - I don't know whether he
ran it at less than the rated voltage.  I used the 92mm size because it is
thinner than the 80 mm size and covers the holes a little better.   His
arrangement is described:

http://home.comcast.net/~roysmorgan/ba/FanPlate.html

I think only gentle air motion is needed.  Best regards,  Dan. 

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Brad Huff
Sent: Tuesday, July 19, 2005 1:46 AM
To: r-390 at mailman.qth.net
Subject: [R-390] R390 cooling fan

Gentlemen,
This question is for those with R390's. What size 220V fan are you using to
cool the regulator tubes (physical size and cfm would be helpful) and I
believe I read earlier about someone having made mounting bracket specs
available for this purpose. Thank you in advance.-Brad
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