Of course you could always employ the method detailed by John Lyles about
instantaneously (almost) dumping the capacitor bank in a 500KW amp!
Carl
KM1H
----- Original Message -----
From: "Dave white" <mausoptik@btinternet.com>
To: "Alex Eban" <alexeban@gmail.com>; "'Angel Vilaseca'"
<avilaseca@bluewin.ch>; <amps@contesting.com>
Sent: Wednesday, July 22, 2009 10:15 AM
Subject: Re: [Amps] inexpensive HV fuse
>I concur.....
>
> If you want to limit flashover damage use a high power surge limit
> resistor in the HT line between capacitor stack and plate choke, and use a
> fuse or overcurrent trip in the primary
>
> There was a circuit in Dubus by OE5JFL which used optoisolators and other
> clever ideas to detect overcurrent and crowbar the ht away. It seems a
> bit overengineered to me but I've seen it work well.
>
> Like others are saying, fuses are too slow and you have no real idea of
> how a spring will behave. Remember how much the tube costs and spend a
> few pennies on a surge resistor
>
> Cheers
> Dave G0OIL
>
> -----Original Message-----
> From: Alex Eban <alexeban@gmail.com>
> Sent: 22 July 2009 12:14
> To: 'Angel Vilaseca' <avilaseca@bluewin.ch>; amps@contesting.com
> Subject: Re: [Amps] inexpensive HV fuse
>
> Response time, guys!!!
> Any thermally operated fuse is TOO SLOW to protect the tube.
> Besides, the spring can carry many tens of Amperes before it heats up
> enough
> to melt.
> You'll probably blow up diodes and tube and God only knows what else!
> Alex 4Z5KS
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Angel Vilaseca
> Sent: Wednesday, July 22, 2009 9:21 AM
> To: amps@contesting.com
> Subject: [Amps] inexpensive HV fuse
>
> Commercially available HV fuses are quite expensive.
>
> I thought of using a small spring instead, like the ones in ball-point
> pens
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