[Milsurplus] Unsoldered joints...

[Peter Gottlieb]

Depends on the company. Doing it well is more difficult than meets the eye; actually visual inspection is not very reliable, to really assure lack of defects requires way more than inspection. 


Peter

> On May 15, 2017, at 1:33 PM, George Babits <gbabits at custertel.net> wrote:
> 
> well, at least there was some semblence of quality control.  It is non existant today.
> 
> 73,
> George
> W7HDL
> 
> 
> ----- Original Message ----- From: "Glenn Little WB4UIV" <glennmaillist at bellsouth.net>
> To: <milsurplus at mailman.qth.net>
> Sent: Monday, May 15, 2017 11:23 AM
> Subject: Re: [Milsurplus] Unsoldered joints...
> 
> 
>> Many years ago, I got a very beat up KWM-2 chassis from the scrap yard.
>> I had thoughts of making it work again.
>> That never happened.
>> While removing usable parts from the chassis, I found the reason it made it to the scrap yard.
>> A wire was looped through a tube socket pin and crimped.
>> No solder, but, there was red paint on where the solder should be showing that it was inspected.
>> So much for QC, I guess it really means Quick Check.
>> 
>> 73
>> Glenn
>> WB4UIV
>> 
>> 
>>> On 5/15/2017 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
>>> 
>>> ---
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>> 
>> -- 
>> -----------------------------------------------------------------------
>> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
>> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
>> QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
>> "It is not the class of license that the Amateur holds but the class
>> of the Amateur that holds the license"
>> ---------------------------------------------------------------------------
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