[TowerTalk] Ferrites 31 vs. 77 material

[Jack Brindle]

Sadly, there is much evidence. Fair-rite quality really took a hit after they moved production to Asia. So much so that many companies have had to institute new QA procedures on incoming product to see if the characteristics come close to fitting the requirements. One of the biggest ones is large 60Hz transformer toroids that were failing in normal service because of the manufacturing issues. The company does still have some non-Asia manufacturing capability, and many companies are specifying product only from those sites.

So yes, the toroids do have issues that are very problematic.

Jack, W6FB

> On Nov 2, 2019, at 11:21 AM, David Gilbert <xdavid at cis-broadband.com> wrote:
> 
> 
> I find that kind of China bashing pretty funny.  Ridiculous as a generalization.
> 
> I worked for a large semiconductor manufacturer for over thirty years and we ended up putting a joint venture manufacturing operation in China ... not simply for low cost, but also to be able to serve the Asian market better and to be able to head off future tariff concerns within China.  We spec'd our own equipment, we trained all the operators, and we put our own managers in key positions.  Most of those positions are now staffed by locals.  The resulting quality was literally best-in-class on a world basis. MANY other U.S., European, and even Japanese companies have done exactly the same, and nothing says that Fair-Rite hasn't as well.
> 
> It is certainly true that many of the smaller locally owned companies in China have sloppy process and quality control, but companies like the large subcontract outfits in China put equivalent U.S. manufacturing to shame for overall manufacturing excellence.
> 
> In the case of ferrites, the problem is the inherent variability of the process itself and the problem previously existed wherever the ferrites were previously manufactured ... including here in the U.S.  Why you think the variability was less before the manufacturing went to China is beyond me.  Several of us here have already explained that it wasn't.
> 
> Dave   AB7E
> 
> 
> 
> On 11/2/2019 10:18 AM, Jim Thomson wrote:
>> Date: Sat, 2 Nov 2019 13:25:19 +0000 (UTC)
>> From: Roger Parsons <ve3zi at yahoo.com>
>> To: "Tower and HF Antenna Construction Topics."
>> <towertalk at contesting.com>, "jim at audiosystemsgroup.com"
>> <jim at audiosystemsgroup.com>
>> Subject: [TowerTalk] Ferrites 31 vs. 77 material
>> 
>> <Very funny.
>> <The posts from both N6RK and AB7E support my statement that variability in ferrite parameters has been known for a very long time. You're the one who asserted that it has just been discovered and that therefore Steve G3TXQ could not have known about it.
>> 
>> <73 RogerVE3ZI
>> 
>> ##  I  believe it  was  N3RR  that  bought  700,   (seven  hundred)   type  31  cores  from  one  supplier,  all  from  the  same  lot number..2 years  ago.  He  used  a  simple  1 turn  link to test them..and then  graded them.  They were all  over the  map,  + and – 22%.   Thats a whopping  44%   spread.  No  2 ferrites  the  same!     ALL  made  in China......so what do  you expect ?  So  much  for  fairite moving  their  factory  to  China.   QC  down  the  tubes  ever  since.
>> 
>> Jim   VE7RF
>> 
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