Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA

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William Kelly
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by William Kelly » Tue Nov 15, 2016 10:52 pm

Jim Stead wrote:In a previous post, Andrew said they used a Claymount CA11 mini connector. See viewtopic.php?f=6&t=10294&p=70621&hilit ... 547#p70621
Does anyone know a way of acquiring one of these CA11 Mini Connectors? I reached out to the company and the eBay seller, unfortunately for me, Claymont only sells to companies and apparently a 16-year-old kid does not qualify as a company. But in all seriousness, if someone knows anything about where to get one of these it would be much appreciated. Thanks!
- William

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Rich Feldman
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Rich Feldman » Tue Nov 15, 2016 11:26 pm

We can make them, William. What kind of HV insulated cable will you use? Which of the four terminals in the negative HV connector well do you want to connect to? So far I've been unable to find a dimensioned drawing of any CA11 connector, so I will measure & report when my PS arrives. I will want to bring out at least two of the terminals, for filament power on x-ray tubes at modest voltage (30 kV?).
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Andrew Seltzman » Wed Nov 16, 2016 12:04 am

Here are the dimensions of the connector, I'll work on a better drawing later
IMG_20161113_201038032.jpg
Designed to be used with this wire:
http://hvstuff.com/1meter-100kv-35kvac- ... e-stranded
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Andrew Seltzman » Wed Nov 16, 2016 12:41 am

Here is an autopsy of one of the CA11 connectors, the plugs are potted and not available as a kit.
IMG_20160801_152630113.jpg
IMG_20160801_152622788.jpg

And the progress in replicating it:
SAM_5224.JPG
IMG_20160726_175654570.jpg
SAM_5226.JPG
Flyer Connector CA11.pdf
(134.48 KiB) Downloaded 227 times
The pins are 2mm diameter, 22mm long with an 11mm insertion depth. Not all of that depth goes into the mating socket because of the potting compound and a silicon gasket
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Peter Schmelcher » Wed Nov 16, 2016 5:45 am

Andrew I also snagged a supply and I just wanted to say thanks for the tip.

Nice work on the replacement connector! When I located the CA11 specifications in medical connectors I thought to myself buying new ones are going to hurt.

I can’t tell from your autopsy picture of the CA11 if any of the 4 wires are in good electrical contact with the black rubber. I am guessing the black rubber is mixed with carbon and is slightly conductive to reduce the maximum E field gradient within the connector/cable dielectric.

Best Wishes,
Peter

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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Andrew Seltzman » Thu Nov 17, 2016 5:25 pm

The center wires are insulated but wrapped in a slightly conductive anti-corona liner. The outside of the cable, starting after the potting epoxy, is wrapped in the same liner under the metal ground braid.

Claymount quoted a 2m cable with a CA11 connector at about $60
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Jim Kovalchick
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Jim Kovalchick » Thu Nov 17, 2016 7:38 pm

Andrew and anyone else,
Do you know if the 600 Watt rating is based on a hard current rating at every voltage, or does the power rating mean you can drive a higher current at lower voltages than you can at rated voltage?

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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Andrew Seltzman » Thu Nov 17, 2016 9:02 pm

Hard current rating, max is 8.56mA
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Peter Schmelcher » Fri Nov 18, 2016 5:08 am

Andrew another thanks.
For $60 I am happy to buy a CA11 pre connected to a cable. I was expecting sticker shock around medical related stuff and had begun looking for materials to build my own. I guess I need to be more open minded.
-Peter

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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Dan Knapp » Fri Nov 18, 2016 12:22 pm

Perhaps given the number of these supplies purchased, we should consider a group purchase of cables.

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