[R-390] DIY cabinet/shielding questions

[Jim Brannigan]

During the last shack re-build, I incorporated a rack size box on one end of
the shelving unit.  It is 24 inches tall, 11 inches deep.  The total length,
including the "rack" is 7 feet.
The entire shelf/rack box is made from 3/4 inch birch veneer plywood,
trimmed with edge moulding.  The shelves are reinforced with 2 inch wide
"stringers".  Stain and about 6 coats of polyurethane give it a nice look
and a hard finish.
For the vertical "face" of the rack section, I used 3/4 inch aluminum angle
iron.  The wood is routed so the angle is flush to the inside of the "box"
then drilled and tapped as appropriate.
Because of the weight, the R-390A is on the bottom and a CV-591 is mounted
above it.  A blank panel with a large line voltage meter is the top piece.
( the line meter is a big 'ole power station job with a brass face plate)
The back of  the rack is open for ventilation and ease of access.
All the covers are in place.  Their primary purpose is to keep dirt out of
the radio.

The aluminum has not stood up very well.  They should be replaced with iron
or steel angle, also I would mount three flush metal strips, front to back,
into the base of the unit.  The wood has been gouged by the weight of the
receiver.

Jim

> Hello everyone. I recently began work on my R-390A and, since I don't have
> any sort of cabinet or rack for the set to go in, I've been toying with
the idea
> of building a wooden cabinet for it. I thought that this sort of project
> would be relatively straightforward, but then the issue of shielding came
to mind.
> Are the top and/or bottom covers detrimental to the correct operation of
the
> receiver? I have the bottom cover and the oft-mentioned "Utah plate," but
am
> currently missing the top cover (anyone know of a source for just this one
> cover? Would Fair Radio be willing to sell me only the top one, since the
bottom
> one is passable?). While looking through the overheating section of the
R-390A
> Pearls of Wisdom archive, I found one post which said that the milspec
metal
> cabinet one owner had used RFI screening over all the holes in the case.
Would
> it be better to try to restore the top cover, cover the insides of the
wooden
> case with some sort of metal screening, both, or would neither be
necessary?
> Also, what would be the best way to bolt the R-390A into the wooden
cabinet?
> TIA.
> -Adam
>
> Adam Vaughn
> Collector of old computers, video game systems, radios and other
electronic
> equipment...
> Visit my page at
> http://www.angelfire.com/ma2/AdamVon/index.html
>
>
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