[Milsurplus] Solder Joints

[Jim Whartenby]

I don't think the issue is about vibration in the field.  The wrap of wire is there to prevent movement of the component lead during the soldering process.  If you look at the Tek soldering videos, they go out of their way to point out how critical it is to not move the component lead while the solder solidifies so as to prevent the notorious cold solder joint.  
MIL-STD-2000A is perhaps the current military soldering spec, See:https://electromet.com/wp-content/uploads/2015/09/Electromet-MILSTD2000a.pdfIt indicates that the wrap around a terminal is a minimum of 180 degrees and 270 degrees maximum.  Unsoldering is as much a skill as soldering.  The only real requirements are patience, a little solder wick, a pick to unwrap the wire and some more patience.
Now that the days are getting shorter, here is hoping for a not so hot summer!Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Sunday, June 22, 2025 at 09:23:07 PM CDT, Michael Hanz <aaf-radio-1 at aafradio.org> wrote:   

  Everyone seems to have forgotten the groundbreaking work that Tektronix did in this area back in the 1960s.  You won't find a single wrapped solder joint in their oscilloscopes from then on.  Now, they did push the use of high silver content solder, and perhaps that helps.  I have never been tempted to follow the old advice ever since then.  Clip the old, push new in with a hot soldering iron on the joint, and add a touch of 3% solder.  Done.
 
 73.
 Mike  KC4TOS
 
 On 6/22/2025 8:08 PM, arc5 at ix.netcom.com wrote:
  
 

Most respectfully disagree. 
 

 
 
Our treasures do not see one 100th of the vibration and rough handling expected in military service. 
 
If the parts are clean and properly tinned and the joint is properly heated, that joint is not going to come loose or vibrate apart before Judgment Day. 
 

 
 
More band switches and tube sockets have been destroyed by trying to un-twist those unnecessarily twisted wires or twist them back than were ever recovered that way.
 

 
 
One man’s opinion, but one man who’s fixed a buncha’ radios. 
 

 
 
73 DE AB5S
 
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