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Re: [TenTec] anyone lose a centurion hv xfmr? (NO!)

To: "John (KE5C)" <ke5c@hot.rr.com>
Subject: Re: [TenTec] anyone lose a centurion hv xfmr? (NO!)
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Reply-to: geraldj@storm.weather.net,Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 15 Apr 2006 08:19:33 -0500
List-post: <mailto:tentec@contesting.com>
On Sat, 2006-04-15 at 00:21 -0500, John (KE5C) wrote:
> http://www.bosshardradio.com/gallery/view_album.php?set_albumName=centurion
> 
> First, a special thanks to Jerry, K0CQ, who correctly interpreted the 
> (completely normal) VOM behavior I was observing when I measured the 
> secondary 
> resistance of my Centurion's HV transformer.  The transformer is indeed fine, 
> and tonite I (almost literally) dug further into the Centurion's innards in 
> order to get to and properly inspect the HV board.  Apparently I suffered a 
> flash over where the secondary HV wires are soldered into the board.  The 
> corona 
> dope in this area is well burned.  The parallel traces on the pc board 
> connecting the HV wire solder holes to the input of the diode chain are 
> vaporized in three separate areas - see yellow boxed areas on middle picture 
> in 
> gallery above.  73, John 

Could have been a flash over on the board, or could be shorted diodes
that drew enough current to burn the traces in two and then the
inductive kick and unloaded transformer lead to a flash over. The diodes
should be more delicate than the board, unless its a faulty board design
without enough spacing.


-- 
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer

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