[Milsurplus] Unsoldered joints...

[Bruce Gentry]

Usually, this happens by mistake. However, employee unrest at a major  
home electronics manufacturer caused thousands of warranty claims in 
late 1968. The 4 section filter condensor was inserted into the circuit 
board and it's tabs twisted, but not soldered.  I was working at a TV 
shop then, and repaired over thirty of these sets. Nasa's standard  is a 
surprise, but it does bring up related debate about replacing bad 
condensors and resistors by cutting the leads and looping the leads of 
the replacement around the stubs of the old rather than unsoldering the 
entire old lead. I prefer to unsolder and remove the old leads 
completely, but  if you do this to many AudioPhool  amplifiers the 
owners get livid.  As a rule I  DO cut the leads at the component body 
and loop the leads of the replacement on a multilayer circuit board.

      Bruce Gentry  KA2IVY

On 5/15/17 11:44 AM, w4thq at cox.net wrote:
> During the 1960's, NASA issued a Soldering Spec. that eliminated twisting wires around terminals.  The requirement for making solder joints that depended only on the solder making the connection allowed bad terminations to be readily identified.
> John  W4THQ
>
>
>
> ---- "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:
>
> =============
> On 15 May 2017 at 7:25, George Babits wrote:
>
>> Un-soldered joints happened all the time.  Nothing unique to surplus, or any
>> specific radio.  I had a Collins 32S-1 with an un-findable intermittent.
>> Finally found that one connection INSIDE one of the IF transformers had
>> never been soldered.
> When I was working as an electronic tech at the University of Montana, one of our professors
> had a very, very expensive Phillips research X-ray machine which would intermittantly shut
> down.
>
> That thing had something like 90 tubes in it.
>
> After a long night of digging into it, I found a no-solder joint on a filament connection to a
> critical tube socket in the power supply section buried at the very bottom of the unit, under at
> least 4 layers of wiring.
>
> I was pissed and the professor was pleased.
>
> Ken W7EKB
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>