[R-390] R-390 Questions - Comments

[Bonddaleena at aol.com]

In a message dated 3/1/2006 2:30:49 PM Eastern  Standard Time, 
roy.morgan at nist.gov writes:
At 01:57 PM 3/1/2006, Dan Merz  wrote:
>Mike,  I put a small fan on the left side of mine near the  regulator tubes,
>to get rid of some of the heat,  mounted on a plate  externally so easily
>removed and with no permanent mod to receiver.   This was ala design of Roy
>Morgan.

R-390/URR folks,

That  fan plate is shown  at:
<http://home.comcast.net/~roysmorgan/ba/FanPlate.html>
One  picture includes a ruler so you can make one yourself easily.

As my notes  tell, the tubes melted speaker wire insulation with no fan, but 
I could put  my fingers on the tubes with the fan.

I have yet to work on a fan inside  the radio. I think there is room to put 
a possibly smaller fan fastened to  the front frame near the B+ filter cap 
with no holed drilled. It would be  powered from inside the radio and not 
need separate turn  on/off.

Roy



- Roy Morgan, K1LKY since 1959 - Keep 'em  Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Cell  301-928-7794
Work: Voice: 301-975-3254,  Fax:  301-948-6213
roy.morgan at nist.gov  --

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I was fortunate to find 2 miniature muffin fans that run on 24 VDC. I  
installed one on each side of my 390A. When they are tun on 12 VDC, they are  
inaudible, but as Roy has mentioned, it really makes for a dramatic reduction in  
internal temperatures.
 
have FUN!!!
 
 
ron
 
N4UE