[R-390] Metal strips on inside of 390A's side panels?

[Cecil Acuff]

My opinion would be to pick up a replacement side panel from Barry Hauser. 
They are "experienced" surplus so it would probably match the look of the 
rest of the radio with no problems.  Beyond that I would drill and bolt the 
strip back in place with some small stainless bolts....or maybe even pop 
rivets from the outside.

Cecil....
----- Original Message ----- 
From: "Barry" <N4BUQ at aol.com>
To: <shoppa_r390a at trailing-edge.com>; <r-390 at mailman.qth.net>
Sent: Monday, January 16, 2006 8:41 PM
Subject: Re: [R-390] Metal strips on inside of 390A's side panels?


> I'd guess that bad welds combined with a couple of shock drops could have
> popped the welds.  I would investigate getting them spot-welded.  JB Weld 
> or
> Super Glue (or even epoxy) really doesn't bond well enough to do the job
> here (at least in my opinion).
>
> Barry - N4BUQ
>
> ----- Original Message -----
> From: "Tim Shoppa" <shoppa_r390a at trailing-edge.com>
> To: <shoppa_r390a at trailing-edge.com>; <r-390 at mailman.qth.net>;
> <N4BUQ at aol.com>
> Sent: Monday, January 16, 2006 7:12 PM
> Subject: Re: [R-390] Metal strips on inside of 390A's side panels?
>
>
>> "Barry" <N4BUQ at aol.com> wrote:
>> > Those strips are spot-welded, not glued, to the side panels.  It is a
> clever
>> > way to gain extra support for the main shelf.  The weight rests on 
>> > these
>> > instead of relying on the shear strength of those little #6-32 screws.
> All
>> > the screws do is keep the center shelf tight against the side panels
> while
>> > the spot-welded strips take the weight.  Also, it helps keep the center
>> > panel at precisely the right height so that the controls will be
> centered as
>> > closely as possible.
>> >
>> > Barry - N4BUQ
>>
>> Thanks Barry. On my yellow striper the welds had undone themselves
>> (what would undo spotwelds?) at a couple
>> of welds. For now some super-glue seems to be holding them in place,
>> although I'm dubious of super-glue providing enough strength to keep
>> the main deck plate supported, that sounds like a job for JB Weld :-).
>>
>> Project for 2005: manufacture an entire R-390A entirely out of JB Weld!
>>
>> Maybe the strip is a different alloy than the aluminum side plate,
>> and temperature differentials did the work of detaching them?
>>
>> And another chemical testimonial: Goof-off is good at removing spray
>> paint from the back and side panels. Takes several applications followed
>> by scraping but it does work (and the original legends are still at
>> least mostly there.) It also removed dymo label remains nearly instantly.
>>
>> Also went into both my RF decks and replaced a bunch of out-of-tolerance
> 1/2W
>> carbon comp resistors. Lots of 10K's were at 20K+, many 2.2K's at 6 or 7
> K,
>> a 1M at 2M, etc. The worst of them had signs of charring (past abuse?)
>> I know I'm a heretic for it, but most of them got replaced by 1W metal
>> films (yeah, yeah, tell me all about their self-inductance...)
>>
>> Why so many charred out-of-tolerance resistors on my RF decks? One
>> was a Stewart-Warner yellow-striper, the other is a Stewart-Warner that
>> has been very gingerly treated over the years. Incidentally, the serial
>> numbers on my two RF decks: #625 and #626! Twin brothers, separated
>> at birth, one treated royally, the other abandoned at SJC, and finally
>> reunited on my bench!
>>
>> Tim.
>>
>
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