Info Help..Results

[Jeramy Thibodeaux]

Ed,

I would like to extend a hats off to you for sharing your finding with the
list.  More than likely, there is someone else on the list needing the same
information.  I found it very useful.


73
Jerry
kg4azt at mindspring.com



----- Original Message -----
From: "Ed Kotkiewicz" <ekotkie at EZL.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Friday, April 27, 2001 1:34 PM
Subject: Info Help..Results


> Well, par for the course, many of the consistent contributors of this
> list came out of the woodwork , yet again, to aid in the repair of a
> "piece of the Green".  In this case, a dead SB-620.
>
> The Hi-V diodes and at least one cap in the PS ckt were found to be
> bad.  The Hi-V diodes were, of course, from the selenium rectifier era
> and had a PIV of 1750.  I knew that I could hook multiple diodes in
> series but as a retired aerospace engineer in the
> Reliability/Maintainability field, I found this to be a weak solution.
> Yes, a number of folks have had success with hooking two 1kv diodes in
> series.  I was hoping to avoid this solution.  Two of you problem
> solvers had one diode solutions.  It was kind of funny, as I had just
> put down the old Mouser catalog when the (I think) best solution came
> through.
>
> Mouser has a couple of 2kv diodes, in stock, at a very reasonable cost.
> I was looking at the specs trying to decide if this might be the way to
> go.  The winning answer came from a frequent problem/solution
> contributor.  Apparently he had used this same diode set not only in the
> 620 but also in repairing 630's.  He also recommended replacing to
> associated Hi-V section capacitor/resistor group. (something I had
> already decided to do).  It is getting harder and harder to find
> hi-voltage rating caps.  In this case, the solution pointed to the
> "orange drops" at AES, which I was also looking at.  I now feel like I
> will be on a clear success path in fixing this "green box".
>
> Now for a little funny sidebar to the story.  The previous owner of the
> box also had the manual.  Apparently these same diodes had failed before
> and I received the failed ones in a separate box along with the unit.
> Whoever replaced the diodes hooked one of the cathode leads to the wrong
> connection on the terminal strip and guess what.....?  It was the ground
> lug!  I showed this to my  resident "Former Ham at Heath" and she shook
> her head at the thought of this costly *fuse*.
>
> So in conclusion, my hat goes off and many thanks to the many responses
> and great suggestions.  No names, you all know who you are.  You are the
> primary contributors to this group and I am very happy to be associated
> with the group.  Without a doubt, this list provides superb, quick
> solutions to those who seek assistance.  Remember, read those manuals,
> keep those connections straight and enjoy the success of repaired
> equipment.
>
> Tx gang
>
> Ed
>
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