[R-390] R-390 (Non A) For Use With CY-979A Cabinet???

[Roy Morgan]

On Apr 8, 2008, at 2:51 PM, David C. Hallam wrote:

> Bruce,
>
> The R-390 needs absolutely all the cooling it can get.

Well, sort of.

>   ... I would never operate mine in
> it.

A ERY good policy!

> I have mine mounted in a cabinet some what taller then the radio  
> with a
> muffin fan mounted on the side of the cabinet blowing air up on the
> regulator tubes.  Both the bottom and top covers are off.

I hacked a piece of aluminum to hold a 4 inch square muffin fan on  
the side of the radio blowing in against the regulator tubes.  I had  
been testing the receiver with 6080's, filament fed from an external  
filament transformer.  I used speaker wire to get the 6.3 volts in to  
the tubes, and the insulation on it MELTED against the tubes.    
"BAD", I thought.

The plate I made fastened under one of the bottom cover screws  
(which  can be installed without the cover installed) and two of the  
frame-to-deck fastening screws.  The trouble is that a normal fan  
cannot be mounted before you slide the radio into a rack or cabinet.   
Thin fans may work fine.  I came up with screw slots that let me  
slide the fan onto the screws after the radio is installed, and it  
"works a treat" as the Irish would say.

I have a good picture of the plate with a ruler included to let folks  
get an idea of what the thing is like.  My fan plate is kind of a  
hacked up ugly thing but it works so well I can put my fingers on the  
tubes and hold them there.  The picture is not posted online now, so  
if folks want to see it, I'll either post it or email it to those who  
ask.

Roy
K1LKY