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 Post subject: HV Wire from China
PostPosted: Apr Tue 06, 2021 1:31 am 
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Location: Alexandria, Virginia
I'm working on a 1950s AM/CW transmitter and will be updating the high voltage power supply. I ordered stranded wire advertised as 18 gauge 20 kV, and upon receiving it find that it was manufactured in China.  Has anyone used HV wire from China with good or bad results?  I ask because there are many posts on this site about problems with components from China. Any sources for HV wire made in USA in small quantities?

Brad K4RT


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 Post subject: Re: HV Wire from China
PostPosted: Apr Tue 06, 2021 1:38 am 
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The only way to tell if the wire will work at it's stated Max Voltage it perform a Break Down Test. Or Hi-Potting as some call it.


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 Post subject: Re: HV Wire from China
PostPosted: Apr Tue 06, 2021 1:40 am 
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I suspect that 20kV wire, good or bad, is still overkill for your application.


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 Post subject: Re: HV Wire from China
PostPosted: Apr Tue 06, 2021 1:43 am 
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Location: Kingwood, Texas
It’s hard to gone wrong with Packard 440 wire. It’s been the go-to high voltage wire for transmitters for close to 100 years.


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 Post subject: Re: HV Wire from China
PostPosted: Apr Tue 06, 2021 2:33 am 
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Yea, really. Even if they are big fat liars and the stuff is only good for say, 9 KV, you are still setting pretty. I would take the time to inspect it for flaws in the insulation in the piece you intend to employ. Such as cracks or thin spots or any other visible flaws. Or the conductor off center alot, I don't know if that can happen but if it did one side would have much better breakdown than the other. If it is actual rubber wire, we know what happens to that eventually. And any wire like that passing thru holes on chassis or something should have protection besides it's own jacket.

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 Post subject: Re: HV Wire from China
PostPosted: Apr Tue 06, 2021 11:45 am 
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you can buy 6KV test lead wire in short hunks just about anywhere, which should be fine for any amateur transmitter out of the 50s.

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 Post subject: Re: HV Wire from China
PostPosted: Apr Wed 07, 2021 11:57 pm 
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In examining the wire, I didn't notice any peculiarities. It's for the plate supply for a Globe King so going with these specs provides some wiggle room.

Brad K4RT


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 Post subject: Re: HV Wire from China
PostPosted: Apr Thu 08, 2021 2:40 am 
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From China does not necessary mean an inferior product.

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 Post subject: Re: HV Wire from China
PostPosted: Apr Thu 08, 2021 3:30 am 
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I agree; my success rate with Chinese stuff has been excellent.


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 Post subject: Re: HV Wire from China
PostPosted: Apr Fri 09, 2021 4:13 am 
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Location: Lexington, KY, USA
Part of the measurement of quality is "how long" it will survive a breakdown test. You may wonder how you could screw this up with modern materials...well, Mercedes used "ecologically friendly, biodegradable' wiring in early 1990's engine compartments. After four or five years, the breakdown voltage dropped to...about 0.00 volts!

At the time, I pointed out to some people that I had successfully reused 40+ year old wiring harnesses from 1960's cars "stored outdoors" in Chicago junkyards, no problemo.


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 Post subject: Re: HV Wire from China
PostPosted: Apr Sat 10, 2021 6:51 am 
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 Post subject: Re: HV Wire from China
PostPosted: Apr Mon 12, 2021 4:25 am 
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Location: Alexandria, Virginia
Electronic components from China bearing established brand names may be fine, but this wire is not in that category.

It turns out I did not need to use the wire. I'll hold onto it, but I'll look into the Packard wire and the 6 kV wire hbr nut and Mike mentioned.

Thanks.

Brad K4RT


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