[R-390] R390/A Cabinets

[ToddRoberts2001 at aol.com]

In a message dated 4/7/2008 2:55:32 P.M. Eastern  Daylight Time, 
David_Wise at Phoenix.com writes:
Has anyone tried these?   They have no cooling slots.

73,
Dave Wise  


Hi Dave,
To really get those Hammond cabinets working right with an R-390/R-390A you  
will have to install your own rails at the bottom to support the chassis  
relative to the front panel. Otherwise if you try to install the R-390/R-390A in  
those cabinets all the strain will be on the front panel when you tighten the  
mounting screws. You can make up rails for the cabinet bottom using aluminum 
or  steel angle stock and spacers to get the height of the chassis to match 
the  front panel screws in the cabinet.
 
Also those particular cabinets can be the basis for an excellent cooling  
cabinet if you install a couple of thin muffin fans in the bottom and use feet  
to raise the cabinet bottom about an inch above the table top to allow cooling  
air to flow under the cabinet to the fans. There is a space or channel under 
the  cabinet of about an inch that is just right to hold some one inch thick 
cooling  fans flush relative to the outside bottom of the cabinet. You would 
need to  punch some 4-inch diameter holes in the bottom for the fans. I made a 
similar  arrangement in a smaller Hammond cabinet for a Racal 6790 and it works 
 great.
 
This arrangement would be perfect for the R-390 as you could place 2  fans 
directly under the area where the 6082 regulator tubes are located and blow  
cool air directly across the audio chassis with the regulator tubes. There is  
space around the sides of the chassis and the top of the radio where the warm  
air can escape out to the rear of the cabinet.
 
73 Todd WD4NGG



**************Planning your summer road trip? Check out AOL Travel Guides.    
  (http://travel.aol.com/travel-guide/united-states?ncid=aoltrv00030000000016)