[Amps] Glitch Resistor

[Hsu]

Hi, 
  Many years past.but why not use semiconductor device to protect your tube?
many modern  flash light in camera with muliti-times flash funtion,
   I think we can use similar schematic in  our HV power supply.But  the
 HV device(more than 5000V even higher ,thyristor or SCR) is very hard to 
get,manybe we  have to put  many
 SCRs  in series.It'll very fast to cut the HV power supply.
       73!Hsu
----- Original Message ----- 
From: "Ian White GM3SEK" <gm3sek at ifwtech.co.uk>
To: <amps at contesting.com>
Sent: Tuesday, February 03, 2009 2:14 AM
Subject: Re: [Amps] Glitch Resistor


> Bob Maser wrote:
>>I'm having a hard time finding a 50 ohm 50W resistor for a glitch 
>>resistor for my 4CX1500B amp.  Seems I remember that I could also use 
>>some AWG 30 for
>>a glitch.
> 
> If they mean to use it as a fuse instead  of a resistor, then NO.
> 
> A fuse provides no current limiting until *after* it has blown. In the 
> time it takes for a fuse to blow (which depends on the size of the 
> current surge) an arc from B+ can do a lot of damage.
> 
> That is why Eimac recommends a resistor, to provide truly instantaneous 
> current limiting. The resistor is there to buy time so that some other, 
> slower device like a fuse or breaker can shut the HV supply down safely. 
> The resistor also guarantees an absolute maximum level of surge current, 
> that the rest  of the circuit can be designed to tolerate.
> 
> See the copy of Eimac Application Bulletin 17:
> http://www.ifwtech.co.uk/g3sek/misc/bull17.pdf
> 
> 
> 
> 
> -- 
> 
> 73 from Ian GM3SEK
> http://www.ifwtech.co.uk/g3sek
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