[Boatanchors] Capacitors (sorry!!)

[Bob - K2KI]

Ditto! I could use something here in the shack!

Michael Baker wrote:
> OH HECK YEA!
> Inexpensive accurate test equipment is just what the doctor ordered!
> Add me to the list of folks who are interested.
>
> Thanks in advance... ;>)
>
> Michael Baker  K7DD
> k7dd at cox.net
>
> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net
> [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of
> bonddaleena at aol.com
> Sent: Thursday, November 05, 2009 3:52 PM
> To: boatanchors at mailman.qth.net
> Subject: [Boatanchors] Capacitors (sorry!!)
>
> Hi, I do NOT want to start a flame throwing contest, or offend folks 
> who insist on original caps, etc. Perhaps EVERYONE already knows what 
> follows, I only hope I can help ONE person!
> I wrote the 'apology' in the Subject line because I had the following 
> comment (back when caps were being discussed), but for some reason, it 
> was never posted..... Anyway.....
>
> Part of my training as an IBM Engineer was in the field of Reliability. 
> I noticed years ago that caps had a very high failure rate. This data 
> was obtained from several sources, including:
>
> Mil Spec data
> IBM data for products both in manufacturing and in the field
> Actual service data from our competitors
>
> I am adding this thought, ONLY because I see a lot of folks on this and 
> a LOT of other Sites stating.. "I tested the suspect cap, and it's OK".
>
> This isn't much of a diagnosis. Believe it or not, I have several dozen 
> cap 'testers' here. Some big $ and some 'el Cheapo'. I have 4 that are 
> calibrated and traceable to NIST. However, at my 'main' test bench, I 
> use one that anyone can put together for cheap.
>
> HOWEVER, (and I cannot stress this enough!!!). Unless you are testing a 
> cap at rated voltage, you ain't learn' much.
>
> For example: I have a 'state of the art', calibrated LCR bridge. BIG $. 
> Runs on a 9 V battery. I can grab a cracked "Black Beauty' of say.... 
> .01 uf / 600V rating and the bridge will measure EXACTLY (.01 uf). Same 
> for the .1 ufs, etc. OK, now test it on one of my many testers that 
> measures at 'rated' voltage', like a Sprague TO-6A (I have several), or 
> a Boonton Lab Bridge, they will 'leak' 500+ volts of the 600VDC applied.
> Yes, I know, that a simple cathode bypass cap, is not going to upset 
> the circuit, but think of a coupling cap from the plate of one tube to 
> the grid of the next.... you get my drift.
>
> I have SO many pieces of test equipment, that I will be selling most of 
> it in the near future. Don't need them. Redundant.
>
> If anyone is interested, I can describe a VERY simple test methodology 
> with simple pieces of gear, that I have used for years and hardly ever 
> go to the
> 'good' equipment.
>
> Ray at ER Magazine has asked me to write a two part article on this 
> subject and also on the dreaded ESR aspect of caps.
> If you would like to know how to use simple test gear for this 
> function, please e-mail directly:
>
> n4ue at arrl.net
> or
> bonddaleena at aol.com
>
> Asbestos suit being donned!
>
> ron
> N4UE
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