[R-390] IF Transformer Covers

[n4buq at knology.net]

On Fri, 28 Apr 2006 09:17:10 -0400, "Tim  Shoppa" <tshoppa at wmata.com> 
wrote :

> Barry asks:
> > The IF deck alignment procedures call for transformer covers with
> holes in 
> > the top to expose the slug drives.  I really don't want to put holes
> in my 
> > permanent covers.  Anyone have a suggestion where I might find some
> spare 
> > covers I can use for this?  I figure the sizes used to be fairly
> common and 
> > available (old TV radios and TVs, etc.), but not sure where I could
> find 
> > those now.
> 
> 390 or 390A?
> 
> At least in my 390A either my covers already have the holes or
> I can swap around with other cans which have the holes.
> 
> A non-historically accurate but easy "modern" way to make very
> good shields is to use modern thin unetched PCB. Cut it with scissors,
> join it with a soldering gun, round it with a file. I'm sure the purists
> who will never use a frequency counter or a scope to align their 390
> because they aren't mentioned in the Navy books will object, but in
> terms of do-ability this has been the preferred method for decades.
> 
> Tim.

It's an R390A.

I don't have the measurements here, but perhaps I could get some square 
aluminum tubing.  It's available from McMaster but I don't know if I can 
get an appropriate size.  The PCB approach sounds good too.

Thanks,

Barry - N4BUQ