[R-390] Broken part need help

[Bob Camp]

Hi

My *assumption* has always been that they dry out rather than absorb moisture. The issue could be some other form of chemical change. The one thing I'm sure of is that they break very easily. I don't remember them being terribly fragile when they were new.

Bob

On Feb 18, 2013, at 8:53 AM, g4gjl at btopenworld.com wrote:

> I wonder if as they age they become at all hygroscopic? That would be disasterous, of course.
> 
> Has anyone done any work on this?
> 
> If not, I shall test a few samples which I have carefully preserved, taken out of gear (not 390s) of the same era.. These were saved in order to replace broken ones in 'required' gear.
> 
> I might end up buying a few dozen PTFE modern equivalents if the results dont look too good.
> 
> Could be that we need to start considering shotgunning terminal posts as well as capacitors.....
> 
> Pete
> 
> G4GJL
> 
> 
> 
> 
> ________________________________
> From: Barry <n4buq at knology.net>
> To: "r-390 at mailman.qth.net Group" <r-390 at mailman.qth.net> 
> Sent: Monday, 18 February 2013, 4:09
> Subject: Re: [R-390] Broken part need help
> 
> They are indeed very easily broken, especially when applying heat for desoldering, etc.  NOS replacements can still be found in this configuration from places like eBay and this site:
> 
> http://angela.com/newoldstock60sbrown722tallterminalposts.aspx
> 
> The nylon or ceramic versions (they usually don't have twin posts, though) are much more durable and can be found a bit easier.
> 
> Regards,
> Barry - N4BUQ
> 
> ----- Original Message -----
>> From: "Bob Camp" <ham at kb8tq.com>
>> To: "r-390 at mailman.qth.net Group" <r-390 at mailman.qth.net>
>> Sent: Sunday, February 17, 2013 9:27:04 PM
>> Subject: Re: [R-390] Broken part need help
>> 
>> Hi
>> 
>> Those posts are a very fragile part of the R-390A. I suspect they
>> were quite a bit stronger "back in the day". In my opinion they are
>> more likely to be the death of these radios than any other single
>> part.
>> 
>> Bob
>> 
>> On Feb 17, 2013, at 12:08 PM, Robert Newberry <N1XBM at amsat.org>
>> wrote:
>> 
>>> Here is the link to a picture of the part:
>>> 
>>> https://picasaweb.google.com/RNNewberry/DropBox02?authuser=0&authkey=Gv1sRgCOTqiqy4kKHOMQ&feat=directlink
>>> 
>>> It's on my R-390 power supply unit. I was replacing the 47 ohm
>>> resistors
>>> and I broke the post. Anyone know what they are called and if they
>>> can be
>>> purchased? I know it's a gound and I could fashion something up,
>>> but I'd
>>> like to replace my mistake.
>>> 
>>> Thanks
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