I would wait until New Years or July 4th to give one a try.
Hi Hi
73
Bill wa4lav
________________________________________
From: MU 4CX250B [4cx250b@miamioh.edu]
Sent: Friday, October 25, 2013 1:48 AM
To: Fuqua, Bill L
Cc: Amps@contesting.com
Subject: Re: [Amps] HV fuses
It didn't sound right to me either, Bill. The seller provided no data
sheets other then claiming a 900 mA/5kV rating for the fuses. I think
they were intended for microwave ovens, but am not sure. As I said, I
bought them out of curiosity because they were so cheap.
Sent from my iPad
> On Oct 24, 2013, at 23:38, "Fuqua, Bill L" <wlfuqu00@uky.edu> wrote:
>
> This does not sound right. I assume you are saying that they are glass
> fuses.
> I suspect if you blow one in a HV powe rsupply it will shatter or explode
> into pieces if
> you have a reasonable value of filter capacitor. Do you have a data sheet on
> these
> fuses?
> 73
> Bill wa4lav
>
> ________________________________________
> From: Amps [amps-bounces@contesting.com] on behalf of Jim Garland
> [4cx250b@miamioh.edu]
> Sent: Thursday, October 24, 2013 7:58 PM
> To: Amps@contesting.com
> Subject: [Amps] HV fuses
>
> Out of curiousity, I bought several 900 mA/5 KV fuses from an eBay Chinese
> supplier. They arrived today. They fit fine into 3AG fuse clips, but are
> about 50% longer. Internally they have a spring connected to the fuse link
> which pulls the connection apart when the fuse opens. If they work, they're
> pretty cool. and VERY inexpenisve. I'm wondering why one couldn't parallel
> two or three of them to multiply the current rating? Assuming they're
> reasonably well matched, so that the current divides equally among the
> fuses, it would be a very compact and inexpensive HV protection circuit. I
> would mount fuse clips on a piece of G10 circuit board and mount the
> assembly on ceramic standoffs. When one fuse opened up, all would open up,
> but replacing three fuses would cost only a dollar or so. I'll test some of
> the fuses ( I bought twenty) to see how accurate their current rating is. I
> have no convenient way to test their HV rating, but I'd use them only at
> 2500V in my dhomebrew amplifier.
>
> 73,
>
> Jim W8ZR
>
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