Re: Bad Solder, DX

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From: James C. Owen, III (owen@piper.eeel.nist.gov)
Date: Fri Oct 17 1997 - 10:09:18 EDT


In message Thu, 16 Oct 1997 23:14:57 -0400 (EDT),
  "J. Skalski" <jskalski@acsu.buffalo.edu> writes:

> I came across a tube socket with several wires attached to one of the
> pins. It wasn't a bad solder joint. It was total absence of solder !
> Here was a top of the line rig with great quality control.

Well one could argue if this was great quality control or not. In my book
this should never have happened. However, I have seen the same thing on a
Hallicrafters SX-115 that I bought a few years back. The notch was
intermittant and what was the problem? A tube pin that had never seen
solder.
Now what is great quality control and how is this type of problem prevented?
When I worked for Defense Electronics Inc. years ago I never remember having
an unsoldered joint on any receiver I worked on. How did they prevent this?
I'll tell you how. When a unit came off the assembly line the line inspector
looked at EVERY solder joint and with a RED MARKER he RED DOTTED each solder
joint. If one was missed it really stood out and if he would try to dot one
with no solder there was no area to take the RED DOT so in effect it
couldn't be RED DOTTED if it wasn't soldered.
72 Jim K4CGY qrp-l #72


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